According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 1999 Jeep Grand Cherokee has 13 documented known issues, with 5 rated critical. The most serious are 4.7L V8 Crankshaft Position Sensor Failure Causing Hot-Restart No-Start and Random Stalling ($80-$350 repair), 1999-2004 4.0L Coolant Loss or Misfire — Confirm the Cylinder Head and Leak Path First, 1999-2010 Airbag Light Plus Horn or Wheel-Control Faults - Scan SRS First, Rear-Mounted Fuel Tank Rupture and Fire Risk in Rear Impacts (Recall 13V-252 / Campaign N45) ($0-$0 repair) and Internal Radiator Transmission-Cooler Failure Cross-Contaminating ATF and Coolant ('Pink Milkshake') ($400-$1,800 repair). Across all issues with published estimates, repair costs range from $40 to $3,000. DIY maintenance guides at au7o.io.
Chrysler Group LLC (Chrysler) is recalling certain model year 2005-2010 Jeep Grand Cherokee vehicles manufactured February 11, 2004, through March 9, 2010; and 2006-2010 Jeep Commander vehicles manufactured January 31, 2005, through March 10, 2010. A transfer case electrical failure may result in an unintentional shifting of the transfer case into the neutral position.
Campaign #13V17500007/05/2013
ELECTRICAL SYSTEM:IGNITION:MODULE
CHRYSLER IS RECALLING CERTAIN MODEL YEAR 2010 CHRYSLER 300, DODGE CHALLENGER, CHARGER, JEEP COMMANDER, GRAND CHEROKEE AND DODGE RAM VEHICLES. THESE VEHICLES MAY HAVE BEEN BUILT WITH A WIRELESS IGNITION NODE (WIN) MODULE EXHIBITING A BINDING CONDITION OF THE SOLENOID LATCH.
Campaign #10V20000011/05/2010
ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
CHRYSLER IS RECALLING CERTAIN MODEL YEAR 2010 JEEP GRAND CHEROKEE PASSENGER VEHICLES MANUFACTURED FROM OCTOBER 22 THROUGH NOVEMBER 12, 2009. THE PASSENGER SIDE AIRBAG MAY NOT PROPERLY DEPLOY THROUGH THE INSTRUMENT PANEL TEAR SEAM.
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What are the most common Jeep Grand Cherokee problems?
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 1999 Jeep Grand Cherokee has 13 documented issues. The most frequently reported are: 4.7L V8 Crankshaft Position Sensor Failure Causing Hot-Restart No-Start and Random Stalling, 1999-2004 4.0L Coolant Loss or Misfire — Confirm the Cylinder Head and Leak Path First, 1999-2010 Airbag Light Plus Horn or Wheel-Control Faults - Scan SRS First. Of these, 5 are rated critical and should be addressed promptly.
Is the Jeep Grand Cherokee reliable?
The 1999 Jeep Grand Cherokee has 13 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 5 issues are rated critical: 4.7L V8 Crankshaft Position Sensor Failure Causing Hot-Restart No-Start and Random Stalling and 1999-2004 4.0L Coolant Loss or Misfire — Confirm the Cylinder Head and Leak Path First and 1999-2010 Airbag Light Plus Horn or Wheel-Control Faults - Scan SRS First and Rear-Mounted Fuel Tank Rupture and Fire Risk in Rear Impacts (Recall 13V-252 / Campaign N45) and Internal Radiator Transmission-Cooler Failure Cross-Contaminating ATF and Coolant ('Pink Milkshake'). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common Jeep Grand Cherokee problems?
Repair costs for known Jeep Grand Cherokee issues range from $0 to $3,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, 4.7L V8 Crankshaft Position Sensor Failure Causing Hot-Restart No-Start and Random Stalling, typically costs $80-$350 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 1999-2004 Jeep Grand Cherokee 4.7L V8 Crankshaft Position Sensor Failure Causing Hot-Restart No-Start and Random Stalling?
The crankshaft position sensor (CKP) on the 4.7L (and 4.0L) Grand Cherokee commonly fails from heat-soak: it works when cold but its internal resistance rises when hot, so the PCM loses the crank signal and the engine won't restart until it cools 30-60 minutes, or it stalls rando… Repairs typically run $80-$350. Severity: high.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.
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On the 1999-2004 Jeep Grand Cherokee 4.7L V8 (PowerTech), the crankshaft position sensor (CKP) on the 4.7L (and 4.0L) Grand Cherokee commonly fails from heat-soak: it works when cold but its internal resistance rises when hot, so the PCM loses the crank signal and the engine won't restart until it cools 30-60 minutes, or it stalls randomly while driving. A cranks-but-no-start after a hot soak is the classic signature and a top WJ search.
Cranks but will not start when hot; restarts after cooling down
Random stalling while driving with immediate/eventual restart
Intermittent no-crank-signal
Tachometer drops to zero while stalling
How to Fix
Verify with a scan tool (loss of CKP signal / no RPM during crank) rather than parts-swapping. Replace with a quality sensor — Mopar crankshaft position sensor 56028666AB fits 1999-2004 4.7L (56028133-series is the CAMSHAFT sensor, do not confuse). Use OEM Mopar or premium NGK/NTK; cheap sensors frequently fail again. On some 4.7L applications the starter must be removed for access.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
Genuine Mopar crankshaft-position sensor
OEMMopar 56028666AB
Replacement after testing confirms the CKP sensor itself failed on a 1999-2004 Grand Cherokee 4.7L Fitment/availability: 56028666AB is the exact reviewed genuine sensor and supersedes 56028666AA, 56028136AC/AD and 56028137AC. Confirm VIN…
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Owner tips & cautions
WarningDo not replace the sensor from P0320 alone. The factory tree also lists CKP supply, ground, signal wiring, cam signal, and PCM causes.
WarningRecall 04V-112 is a limited 2004 4.0L campaign; it does not make a 1999-2004 4.7L sensor replacement a recall repair.
TipThe 4.7L sensor sits above the starter. Follow the factory O-ring, flush-seating, and torque precautions so the new sensor is not damaged during installation.
On the 1999-2004 Jeep Grand Cherokee 4.0L I6 (PowerTech 242); identify the installed cylinder-head casting before ordering, a cracked cylinder head or failed head gasket can produce coolant loss, overheating, rough running, or cylinder leakage on a 4.0L Grand Cherokee, but the previous card treated every 1999-2004 vehicle as if its installed casting and failure mode were already known. Heads may have been replaced during the vehicle's life, and DaimlerChrysler also documented P0300 and single-cylinder misfires from slow-closing exhaust valves caused by carbon. A model year, a P030x code, or coolant loss by itself does not prove a crack between cylinders 3 and 4 or identify the correct replacement head.
Unexplained coolant loss after external leaks are checked
Overheating or unstable coolant temperature
Rough running or a cylinder-specific misfire
Combustion gas in the cooling system
Oil and coolant cross-contamination
How to Fix
Start with the cooling system and the actual failure path: pressure-test the system cold, inspect external leak points, test for combustion gas where appropriate, and inspect the oil and coolant for cross-contamination. For a misfire, follow the factory diagnostic path and use compression and leak-down results rather than assigning the code to the head. Record the installed casting/foundry markings because a prior repair may have changed the head. If removal is justified, have the head and deck inspected and pressure-tested by a qualified machine shop. Only after the crack, deck condition, installed casting, and required machining are known should the shop select an application-specific head, gasket set, and fastener plan. No universal replacement head is linked here.
Owner tips & cautions
WarningDo not buy a cylinder head from the model year alone. Read the markings on the head that is actually installed; a previous engine repair may have changed the casting.
WarningP0300 or a cylinder-specific misfire does not prove a cracked head. DaimlerChrysler documented another 4.0L cause—slow-closing exhaust valves from carbon—within this same WJ year range.
TipBefore ordering repair parts, preserve the pressure-test, combustion-gas, compression, leak-down, casting-identification, and machine-shop findings so the part choice matches the confirmed failure.
On the 1999-2009 Jeep Grand Cherokee, the 4.7L V8 used in Grand Cherokee models is widely reported to develop broken exhaust manifold bolts or warped manifold sealing surfaces, especially after repeated heat cycles. Owners typically notice a ticking noise on cold start that may quiet as the engine warms, sometimes mistaken for valvetrain noise. Left unrepaired, the leak can worsen and may contribute to exhaust odor or failed emissions inspection.
Confirm the leak with a cold-start inspection, listening near the manifold and checking for soot around the flange and broken fasteners. Repair usually involves extracting broken studs/bolts, resurfacing or replacing the manifold if warped, and installing new hardware and gaskets. Penetrating oil, heat, and careful extraction are often required because broken fasteners in the cylinder head are common.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
Crown 53034029K left-and-right exhaust-manifold gasket set
OEMCrown 53034029K
Manifold-to-head reseal after the leak side is confirmed and the manifold is removed Fitment/availability: Pair of MLS gaskets cataloged for 1999-2007 Grand Cherokee 4.7L. Confirm VIN and current left/right supersessions; this link does …
Driver-side manifold replacement only when the 1999-2004 WJ manifold is warped or cracked Fitment/availability: Exact 1999-2004 Grand Cherokee 4.7L driver-side kit with gasket and downpipe hardware. Not for 2005-2009 WK and not needed fo…
Passenger-side manifold replacement only when the 1999-2004 WJ manifold is warped or cracked Fitment/availability: Dorman's application is 1999-2004 Grand Cherokee and the kit includes gasket/downpipe hardware. Not for 2005-2009 WK.
On the 1994-2004 Jeep Grand Cherokee 4.0L I6 (PowerTech 242), the 4.0L inline-six routes oil through an aluminum oil-filter adapter housing bolted to the block; its O-rings harden and leak with age, dripping oil down the rear/side of the block. Because the oil migrates rearward, it is very commonly misdiagnosed as a rear main seal or oil-pan leak. One of the most frequent 4.0L oil-leak searches for ZJ/WJ owners.
Common Symptoms
Oil leak/drip on the passenger side and rear of the block
Oil smell and spots under the vehicle
Oil on the oil filter and adapter area
Gradual oil-level drop with no smoke
How to Fix
Replace the oil-filter adapter O-ring kit — Crown Automotive / Mopar 4720363 (a 3-O-ring kit, adapter retained by a T60 Torx bolt). Clean the mating surface first. A popular permanent alternative deletes the adapter housing and runs a shorter PH3614-style filter directly. Confirm the source with the housing area cleaned and dye if needed before condemning the rear main.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
MAHLE oil-filter-adapter three-seal gasket kit
OEMMAHLE GS33781 / 72117 / 72119 / 72230
Seal replacement after the oil-filter adapter is confirmed as the first leak source on a 1994-2004 Grand Cherokee 4.0L Fitment/availability: GS33781 contains the three MAHLE seals mapped to the audited 4.0L endpoints.
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Owner tips & cautions
TipDegrease the area and establish the first wet point before buying parts. Oil from the filter gasket, sender, valve-cover edge, oil-pan rail, or rear of the engine can cross the same area.
WarningThe old card's T60-fastener and adapter-delete advice was not universal enough for this full year span. Follow the service information for the exact adapter installed on the vehicle.
On the 1999-2010 Jeep Grand Cherokee, the clockspring is a plausible shared point when a Grand Cherokee has an airbag warning together with a failed horn, cruise control, or steering-wheel buttons. Factory wiring confirms that those circuits pass through the clockspring/steering-control assembly. That symptom combination does not prove the clockspring has failed, however: an SRS indicator means the restraint controller detected a monitored fault, and horn switches, relays, wiring, connectors, steering-control electronics, airbag circuits, and controller faults require separate diagnosis. The old card also combined 1999-2004 WJ and 2005-2010 WK part numbers without complete catalog or configuration proof.
Common Symptoms
Airbag or SRS warning indicator
Horn inoperative from the steering wheel
Cruise-control or steering-wheel buttons inoperative
Fault changes with steering-wheel position
How to Fix
Treat an illuminated airbag indicator as a safety fault and have the SRS scanned with a restraint-capable tool. Record the exact active and stored DTCs, follow the model-year circuit tree, and test the horn and steering-wheel functions independently before condemning the clockspring. If circuit testing confirms the clockspring/steering-control assembly, select the replacement by VIN, model year, steering-wheel controls, steering-angle-sensor configuration, and current Mopar supersession. The assembly must be centered and the steering wheel kept in the correct position. SRS service can cause accidental deployment: follow the factory disable procedure, isolate the negative battery cable, wait the specified discharge time, and use trained service if you are not qualified. After repair, clear and recheck SRS DTCs and verify every wheel function.
Owner tips & cautions
WarningDo not probe airbag inflator circuits with an ordinary test light or meter and do not rotate an uncentered replacement clockspring. Follow the model-year SRS procedure or use a qualified technician.
TipSave the exact SRS DTCs before clearing them. The lamp plus a dead horn is a useful clue, but the DTC and circuit test determine whether the clockspring is actually open.
On the 1994-2004 Jeep Grand Cherokee, for the ZJ (1993-1998) and WJ (1999-2004) Grand Cherokee, Chrysler mounted the plastic fuel tank behind the rear axle with little rear-structure protection. NHTSA and the Center for Auto Safety documented that these vehicles were far more likely to suffer a fatal post-crash fire in rear impacts. Recall 13V-252 (issued June 19, 2013) covered ~1.56 million 1993-2004 Grand Cherokee and 2002-2007 Liberty vehicles. This is one of the most-searched safety topics for older Grand Cherokees.
Common Symptoms
Fuel tank located behind the rear axle with minimal shielding
Elevated fire risk in rear-end collisions
Recall remedy (rear reinforcement hitch) not yet installed
How to Fix
Recall remedy (Campaign N45, free at Jeep dealers) installs a factory Mopar trailer-hitch/rear-structure reinforcement that shields the tank in low-to-moderate rear impacts. Owners should verify the recall was completed via VIN at NHTSA/the dealer; if not, have the hitch installed. Note critics consider the fix only a partial mitigation — the tank position is unchanged.
On the 1999-2004 Jeep Grand Cherokee, on the WJ the automatic-transmission fluid cooler is integrated inside the radiator end tank. As the radiator ages the internal cooler barrier fails, allowing engine coolant and ATF to intermix under pressure. The result is a pink/tan 'strawberry milkshake' in both the transmission and cooling system. Coolant (ethylene glycol) in the transmission destroys clutch material and can ruin the 42RE/45RFE if not caught quickly.
Stop driving once contamination is found. Replace the radiator (OEM Mopar radiator by application, or aftermarket CSF/Spectra/Koyorad for 1999-2004 WJ) and thoroughly flush the cooling system. Flush/replace ATF and the transmission filter multiple times; badly contaminated transmissions need a rebuild. Many owners add an external auxiliary trans cooler and bypass the in-radiator cooler to prevent recurrence.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
Spectra Premium radiator with transmission-oil cooler for the 4.0L branch
OEMSpectra Premium CU2262
Radiator replacement after an internal cooler breach is confirmed on a compatible 4.0L WJ Fitment/availability: Spectra CU2262 is manufacturer-cataloged for 1999-2004 Grand Cherokee Laredo 4.0L applications and identifies a plated transm…
Crown Automotive radiator with automatic-transmission cooler for 4.7L WJ
OEMCrown Automotive 52079883AB
Radiator replacement after an internal cooler breach is confirmed on a compatible 4.7L WJ Fitment/availability: Crown 52079883AB is explicitly listed for 2001-2004 Grand Cherokee WJ 4.7L gasoline. Confirm VIN, cooler fittings and product…
Correct-specification replacement fluid during a measured, specialist-directed transmission recovery service Fitment/availability: 68218058AC is Mopar ATF+4 in a five-liter container. Determine the actual service quantity and whether flu…
On the 1999-2004 Jeep Grand Cherokee, the WJ PCM (engine computer) can develop internal faults — often heat/temperature-related micro-cracks or solder failures — that cause intermittent stalling, hard-to-diagnose no-starts and driveability problems that come and go with ambient temperature. A well-known WJ case: a 2000 4.7L stalled only when outside air exceeded ~60F; a rebuilt/replaced PCM cured it after many other parts were replaced in vain.
Intermittent stalling, often correlated with heat/warm weather
Crank but no-start that comes and goes
Multiple unrelated sensor codes
Driveability that improves when cold
Repairs of individual sensors don't resolve it
How to Fix
Diagnose by elimination after CKP, fuel pump, and grounds are ruled out. Options: send the PCM for bench repair (specialists like Circuit Board Medics), or install a remanufactured PCM programmed to the vehicle's VIN and SKIM/immobilizer. Any replacement PCM must be VIN-programmed to run. Inspect PCM connectors/pins for corrosion first.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
UpFix repair-and-return service for the original WJ PCM
OEMUpFix 46855
Bench repair of the vehicle's original PCM only after vehicle-side diagnosis confirms an internal module fault covered by the service Fitment/availability: SKU 46855 describes a repair-and-return service for 1996-2004 Grand Cherokee 4.0L…
On the 1999-2004 Jeep Grand Cherokee, the WJ-generation Grand Cherokee instrument cluster is a well-known weak point. Owners report gauges that suddenly stop working, read erratically, or dim so far they're unreadable even with the dash brightness turned all the way up. Causes range from loose/corroded cluster connectors and cold-solder joints to electroluminescent backlight aging and Body Control Module (TIPM) interaction. The condition is often intermittent at first (a firm tap on the dash or an odometer-reset press temporarily restores the gauges) before becoming permanent.
Speedometer/tach/gauges suddenly quit or read erratically
Gauge and odometer backlight too dim to read
Intermittent operation restored by tapping dash or pressing odometer reset
Multiple gauges failing together
How to Fix
Remove the cluster and reseat/clean the connectors with contact cleaner; resecure loose plugs. Repair cold-solder joints on the cluster circuit board or replace the cluster (2002-2004 electroluminescent clusters can be retrofitted into 1999-2001 cars). Verify BCM/grounds if multiple unrelated gauges drop together. Re-check connector retention after reinstall.
On the 1994-2004 Jeep Grand Cherokee, zJ (1993-1998) and especially WJ (1999-2004) Grand Cherokees in salt/rust-belt climates are notorious for corrosion of the rocker panels, rear quarter/wheel-arch lips, floor pans and rear cargo area. Because these are unibody structures, the rot is both cosmetic and structural, and it is a very common reason high-mileage examples fail inspection or get retired.
Common Symptoms
Bubbling paint and rust-through on rockers and rear wheel-arch lips
Perforated floor pans / water in cabin
Flaking rust in the rear cargo/spare-tire area
Structural weakness at jack points
How to Fix
Cut out corroded metal and weld in replacement panels: aftermarket rockers (Key Parts 0484-101 driver / 0484-102 passenger for 99-04 WJ) and rear wheel arches (Key Parts 0484-147), plus floor-pan sections as needed (Mill Supply / Classic 2 Current). Requires welding — professional bodywork recommended. Undercoat afterward and keep the rocker/pinchweld drain holes clear to slow recurrence.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
Key Parts left outer rocker panel for 1999-2004 WJ
OEMKey Parts 0484-101
Left outer-skin component in a body-shop-confirmed repair with sound or separately repaired inner structure Fitment/availability: 0484-101 is the left/driver WJ panel and the live listing identifies 1999-2004 Grand Cherokee compatibility…
Key Parts right outer rocker panel for 1999-2004 WJ
OEMKey Parts 0484-102
Right outer-skin component in a body-shop-confirmed repair with sound or separately repaired inner structure Fitment/availability: 0484-102 is the right/passenger WJ panel and the live listing identifies 1999-2004 Grand Cherokee compatib…
Key Parts left outer rocker panel for 1993-1998 ZJ
OEMKey Parts 0483-101
Left outer-skin component in a body-shop-confirmed repair with sound or separately repaired inner structure Fitment/availability: 0483-101 is the left/driver ZJ panel and the live listing identifies 1993-1998 Grand Cherokee/Grand Wagonee…
Key Parts right outer rocker panel for 1993-1998 ZJ
OEMKey Parts 0483-102
Right outer-skin component in a body-shop-confirmed repair with sound or separately repaired inner structure Fitment/availability: 0483-102 is the right/passenger ZJ panel and the live listing identifies 1993-1998 Grand Cherokee/Grand Wa…
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Owner tips & cautions
WarningDo not place a jack or stand on a perforated or collapsing pinch weld. Have the lift points and adjacent structure assessed before the vehicle is raised there again.
WarningAn outer rocker panel is a repair skin, not proof that hidden inner structure is sound. Cutting and welding should follow a measured body-repair plan with fire protection and restored corrosion protection.
On the 1999-2004 Jeep Grand Cherokee, the combined in-tank fuel pump / level-sender module on the WJ Grand Cherokee wears out with age: the pump loses pressure (needs ~49-58 psi) causing crank-no-start or hot stalling, while the integrated sending-unit float/resistor card fails causing erratic or stuck fuel-gauge readings. Both a no-start and a jumpy fuel gauge are heavily searched WJ complaints and often the same module.
Fuel-pressure test before replacing. Replace the complete in-tank fuel pump module assembly (Mopar module by application, or quality aftermarket Airtex/Spectra/Delphi for 1999-2004 WJ) rather than just the pump. If the gauge stays erratic after replacement, check the tank-to-cluster wiring/grounds and the instrument cluster gauge circuit. Avoid bending the float arm on install.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
Mopar 5018056AC complete fuel-pump and level-sender module
OEMMopar 5018056AC
Complete module replacement after vehicle-side electrical, pressure/volume and sender diagnosis confirms failure Fitment/availability: The exact page lists 5018056AC with 5012380AD and multiple OE/aftermarket crosses for 1999-2004 WJ 4.0…
On the 1999-2004 Jeep Grand Cherokee, the WJ's on-demand NV247 (Quadra-Trac II) and full-time NV242 (Selec-Trac) transfer cases suffer fluid leaks from the case split-line, rear output slip-yoke seal and a plugged vent, plus a pressure/heat issue: many 1999 units were filled with the WRONG fluid from the factory. Low/incorrect fluid leads to the NV247's progressive coupling binding, chatter on turns and eventual internal wear.
Common Symptoms
Fluid leak at the rear output seal or case seam
Low transfer-case fluid
Bind, chatter or hop on tight turns (NV247)
Whine/growl from the transfer case
Fluid pushed out of the vent when hot
How to Fix
Keep the transfer case topped and use the correct fluid — the NV247 requires Mopar/NV247 ATF (equivalent to Mobil 424 hydraulic-tractor fluid), NOT ordinary gear oil. Fix leaks by replacing the rear output/slip-yoke seal and resealing the case halves, and clear/replace the plastic vent cap so pressure can't push fluid past the seals. Verify factory fill on early 1999 units.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
Genuine Mopar NV247 transfer-case lubricant, one quart
OEMMopar 05016796AE
Correct fluid for a tag-confirmed NV247 transfer case in the audited 2001-2004 WJ retail branch Fitment/availability: Current product is 05016796AE replacing AA-AD/68065072AA and is explicitly listed for 2001-2004 WJ. Buy the service-man…
Genuine Mopar ATF+4 five-liter fluid for NV242 Selec-Trac
OEMMopar 68218058AC
Correct fluid for a tag-confirmed NV242 transfer case Fitment/availability: 68218058AC is ATF+4 and the WJ owner/service information specifies ATF+4 for NV242.
Seal replacement only after cleaning and inspection confirms the NV247 rear output is the leak source Fitment/availability: Crown 4897298AA is listed for 1999-2004 WJ 4.0L/4.7L with NV247. Verify the case tag, shaft/yoke surface, vent op…
On the 1994-2004 Jeep Grand Cherokee, the HVAC blower-motor resistor on ZJ (1993-1998) and WJ (1999-2004) Grand Cherokees commonly burns out, leaving the fan working only on the highest setting (which bypasses the resistor). A worn blower motor drawing excess amperage cooks the resistor, and the connector often overheats. Very common, cheap, high-search fix.
Common Symptoms
Blower only runs on the highest (or a single) speed
No airflow on low/medium settings
Intermittent fan operation
Burnt smell or melted resistor connector
How to Fix
Replace the blower motor resistor located under the passenger-side dash — Mopar 5012699AA (RU-358) fits 1999-2004 WJ with ATC; use the matching resistor for manual A/C (Crown 4720278 for 93-99 ZJ/WJ manual). If a new resistor fails quickly, also replace the aging blower motor and the burnt resistor connector/pigtail to stop repeat failures.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
Genuine Mopar manual-climate blower motor resistor for 1999 WJ
OEMMopar 4720278 / 04720278
Replacement after a 1999 WJ manual-climate circuit test confirms the resistor failed Fitment/availability: Mopar 4720278 is identified by the vehicle-specific catalog for the 1999 Grand Cherokee. Confirm VIN, manual controls, connector s…
Genuine Mopar manual-climate blower motor resistor for 2000-2004 WJ
OEMMopar 5014212AA
Replacement after a 2000-2004 WJ manual-climate circuit test confirms the resistor failed Fitment/availability: Mopar 5014212AA is cataloged for the audited 2000-2004 WJ manual-climate branch. Confirm VIN, HVAC type, connector shape, cur…
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Owner tips & cautions
WarningManual climate control and Automatic Zone Control do not use the same speed-control part. Confirm the HVAC control type before ordering.
TipInspect the connector for melting or loose terminals and check blower current draw; replacing only the resistor can fail again if the underlying circuit problem remains.
CHRYSLER IS RECALLING CERTAIN MODEL YEAR 2010 CHRYSLER SEBRING; DODGE AVENGER AND NITRO; JEEP LIBERTY, COMMANDER AND GRAND CHEROKEE; AND MODEL YEAR 2009-2010 DODGE RAM TRUCK. THESE VEHICLES MAY HAVE BEEN BUILT WITH AN IMPROPERLY FORMED OR MISSING BRAKE BOOSTER INPUT ROD RETAINING CLIP.
Campaign #10V00900011/01/2010
EQUIPMENT
CHRYSLER IS RECALLING MODEL YEAR 2010 JEEP COMMANDER AND GRAND CHEROKEE VEHICLES. THEY MAY HAVE BEEN BUILT WITH AN IMPROPERLY MANUFACTURED REAR TRACK BAR.
What is the 1999-2004 Jeep Grand Cherokee 1999-2004 4.0L Coolant Loss or Misfire — Confirm the Cylinder Head and Leak Path First?
A cracked cylinder head or failed head gasket can produce coolant loss, overheating, rough running, or cylinder leakage on a 4.0L Grand Cherokee, but the previous card treated every 1999-2004 vehicle as if its installed casting and failure mode were already known. Heads may have… Severity: high.
What is the 1999-2010 Jeep Grand Cherokee 1999-2010 Airbag Light Plus Horn or Wheel-Control Faults - Scan SRS First?
The clockspring is a plausible shared point when a Grand Cherokee has an airbag warning together with a failed horn, cruise control, or steering-wheel buttons. Factory wiring confirms that those circuits pass through the clockspring/steering-control assembly. That symptom combina… Severity: high.
What is the 1994-2004 Jeep Grand Cherokee Rear-Mounted Fuel Tank Rupture and Fire Risk in Rear Impacts (Recall 13V-252 / Campaign N45)?
For the ZJ (1993-1998) and WJ (1999-2004) Grand Cherokee, Chrysler mounted the plastic fuel tank behind the rear axle with little rear-structure protection. NHTSA and the Center for Auto Safety documented that these vehicles were far more likely to suffer a fatal post-crash fire… Repairs typically run $0-$0. Severity: high.
What is the 1999-2004 Jeep Grand Cherokee Internal Radiator Transmission-Cooler Failure Cross-Contaminating ATF and Coolant ('Pink Milkshake')?
On the WJ the automatic-transmission fluid cooler is integrated inside the radiator end tank. As the radiator ages the internal cooler barrier fails, allowing engine coolant and ATF to intermix under pressure. The result is a pink/tan 'strawberry milkshake' in both the transmissi… Repairs typically run $400-$1,800. Severity: high.
What is the 1999-2004 Jeep Grand Cherokee Powertrain Control Module (PCM) Failure Causing Intermittent Warm-Weather Stalling and No-Start?
The WJ PCM (engine computer) can develop internal faults — often heat/temperature-related micro-cracks or solder failures — that cause intermittent stalling, hard-to-diagnose no-starts and driveability problems that come and go with ambient temperature. A well-known WJ case: a 20… Repairs typically run $300-$1,000. Severity: medium.
What is the 1994-2004 Jeep Grand Cherokee Body/Unibody Rust-Through — Rocker Panels, Rear Wheel Arches and Floor Pans?
ZJ (1993-1998) and especially WJ (1999-2004) Grand Cherokees in salt/rust-belt climates are notorious for corrosion of the rocker panels, rear quarter/wheel-arch lips, floor pans and rear cargo area. Because these are unibody structures, the rot is both cosmetic and structural, a… Repairs typically run $500-$3,000. Severity: medium.
What is the 1999-2004 Jeep Grand Cherokee In-Tank Fuel Pump Module Failure and Fuel-Level Sending Unit Fault (No-Start / Erratic Gauge)?
The combined in-tank fuel pump / level-sender module on the WJ Grand Cherokee wears out with age: the pump loses pressure (needs ~49-58 psi) causing crank-no-start or hot stalling, while the integrated sending-unit float/resistor card fails causing erratic or stuck fuel-gauge rea… Repairs typically run $250-$800. Severity: medium.
What is the 1999-2004 Jeep Grand Cherokee Instrument Cluster Gauge Dropout and Dimming Failure (WJ)?
The WJ-generation Grand Cherokee instrument cluster is a well-known weak point. Owners report gauges that suddenly stop working, read erratically, or dim so far they're unreadable even with the dash brightness turned all the way up. Causes range from loose/corroded cluster connec… Repairs typically run $150-$600. Severity: medium.
What is the 1999-2004 Jeep Grand Cherokee NV247 Quadra-Trac II / NV242 Transfer Case Fluid Leak, Overheat and Bind/Chatter?
The WJ's on-demand NV247 (Quadra-Trac II) and full-time NV242 (Selec-Trac) transfer cases suffer fluid leaks from the case split-line, rear output slip-yoke seal and a plugged vent, plus a pressure/heat issue: many 1999 units were filled with the WRONG fluid from the factory. Low… Repairs typically run $100-$900. Severity: medium.
What is the 1999-2009 Jeep Grand Cherokee Exhaust Manifold Bolt Failure and Manifold Leak on 4.7L V8?
The 4.7L V8 used in Grand Cherokee models is widely reported to develop broken exhaust manifold bolts or warped manifold sealing surfaces, especially after repeated heat cycles. Owners typically notice a ticking noise on cold start that may quiet as the engine warms, sometimes mi… Repairs typically run $400-$1,400. Severity: medium.
What is the 1994-2004 Jeep Grand Cherokee 4.0L Oil Filter Adapter Housing O-Ring Leak (Frequently Misdiagnosed as Rear Main Seal)?
The 4.0L inline-six routes oil through an aluminum oil-filter adapter housing bolted to the block; its O-rings harden and leak with age, dripping oil down the rear/side of the block. Because the oil migrates rearward, it is very commonly misdiagnosed as a rear main seal or oil-pa… Repairs typically run $100-$400. Severity: low.
What is the 1994-2004 Jeep Grand Cherokee Front Blower Motor Resistor Failure — HVAC Fan Works Only on High Speed?
The HVAC blower-motor resistor on ZJ (1993-1998) and WJ (1999-2004) Grand Cherokees commonly burns out, leaving the fan working only on the highest setting (which bypasses the resistor). A worn blower motor drawing excess amperage cooks the resistor, and the connector often overh… Repairs typically run $40-$250. Severity: low.
