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 6 rated critical. The most serious are 1999-2004 4.7L P0320 or Crank-No-Start — Test the CKP Signal and Circuit First, 1999-2010 Airbag Light Plus Horn or Wheel-Control Faults - Scan SRS First, 1993-2004 Rocker, Wheel-Arch or Floor Corrosion - Inspect the Structure First, Rear-Mounted Fuel Tank Rupture and Fire Risk in Rear Impacts (Recall 13V-252 / Campaign N45) ($0-$0 repair), 1999-2004 4.0L Coolant Loss or Misfire — Confirm the Cylinder Head and Leak Path First 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 $100 to $1,800. DIY maintenance guides at .
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: 1999-2004 4.7L P0320 or Crank-No-Start — Test the CKP Signal and Circuit First, 1999-2010 Airbag Light Plus Horn or Wheel-Control Faults - Scan SRS First, 1993-2004 Rocker, Wheel-Arch or Floor Corrosion - Inspect the Structure First. Of these, 6 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. 6 issues are rated critical: 1999-2004 4.7L P0320 or Crank-No-Start — Test the CKP Signal and Circuit First and 1999-2010 Airbag Light Plus Horn or Wheel-Control Faults - Scan SRS First and 1993-2004 Rocker, Wheel-Arch or Floor Corrosion - Inspect the Structure First and Rear-Mounted Fuel Tank Rupture and Fire Risk in Rear Impacts (Recall 13V-252 / Campaign N45) and 1999-2004 4.0L Coolant Loss or Misfire — Confirm the Cylinder Head and Leak Path First 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 $1,800, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 1999-2004 Jeep Grand Cherokee 1999-2004 4.7L P0320 or Crank-No-Start — Test the CKP Signal and Circuit First?
A missing crank-reference signal can cause a crank-no-start or an engine stall on the 4.7L Grand Cherokee. In the factory diagnostic, P0320 means the PCM did not receive the expected crankshaft-position signal during cranking after camshaft-position signals occurred. The possible… 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.
Filter:
On the 1999-2004 Jeep Grand Cherokee 4.7L V8 (PowerTech; standard or High Output where equipped), a missing crank-reference signal can cause a crank-no-start or an engine stall on the 4.7L Grand Cherokee. In the factory diagnostic, P0320 means the PCM did not receive the expected crankshaft-position signal during cranking after camshaft-position signals occurred. The possible causes include an intermittent CKP signal, cam signal, 5-volt supply, sensor ground, CKP signal wiring, the sensor, or the PCM. The prior card called heat-soak sensor failure common, included P0335 and P0339, and implied the same path for the 4.0L without primary support for those claims.
Missing crankshaft-position signal during cranking
How to Fix
Capture codes and scan data during the failure. For P0320, follow the 4.7L factory test sequence: inspect the CKP and cam connectors and harness routing, verify the 5-volt supply and sensor ground, test the signal circuit for opens/shorts, and confirm the crank-reference signal before condemning the sensor or PCM. If diagnosis identifies the CKP sensor, verify the VIN/engine against Mopar 56028666AB and its supersessions before ordering. The factory procedure places the sensor in the block above the starter and requires starter removal; inspect and lubricate the sensor O-ring, seat the sensor flush, and use the service-manual torque. Clear codes and verify the signal and restart behavior after repair.
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.
Common Symptoms
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.
Owner tips & cautions
TipOwners recommend replacing all manifold hardware on the affected side once one bolt breaks, rather than only the visibly failed fastener.
TipA smoke test or cold-start stethoscope check helps distinguish manifold leaks from injector or valvetrain noise.
On the 1994-2004 Jeep Grand Cherokee 4.0L I6 (PowerTech/AMC 242), oil can collect around the 4.0L oil-filter adapter and travel along the block, but the wettest visible point is not always the source. The prior card correctly pointed owners toward the adapter seals yet overstated how often the leak is misdiagnosed and assigned a single Mopar/Crown number across the entire span without catalog proof. ShowMeTheParts does map MAHLE's three application-specific seals and GS33781 kit to the 1994 and 1999-2004 Grand Cherokee 4.0L applications checked in this audit.
Common Symptoms
Fresh engine oil around the oil-filter adapter
Oil tracking along the side or rear of the engine block
Oil spots beneath the engine
Gradual engine-oil level loss
How to Fix
Clean the adapter, filter sealing surface, oil-pressure sender area, valve-cover edge, oil-pan rail, and nearby block, then recheck after a short run; use fluorescent dye if the path is not obvious. Confirm that the oil starts at an adapter seal rather than the filter gasket, sender, valve cover, oil pan, or rear main area. Once the adapter is confirmed, replace all three application-matched seals and inspect the adapter and sealing surfaces for damage. The exact MAHLE GS33781 kit below contains the catalog-matched seal set, but verify the vehicle and 4.0L engine on the product page before ordering. Recheck for leakage and oil level after the repair.
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.
Medium ConfidenceVerified0 reportsReviewed Jul 2026
On the 1993-2004 Jeep Grand Cherokee, visible corrosion at an outer rocker, rear wheel arch, or floor can range from a limited outer-skin repair to extensive loss of the inner rocker, pinch weld, floor reinforcement, suspension or seat-belt mounting areas, or adjacent unibody structure. A replacement outer panel does not prove the vehicle is structurally repairable and should not be used to hide unsupported metal. The prior card's broad prevalence, price, and do-it-yourself framing did not distinguish cosmetic sheet metal from load-carrying corrosion.
Common Symptoms
Bubbling paint, perforation, or flaking metal at a rocker or rear wheel arch
Soft or deformed pinch weld or jacking area
Floor corrosion, water intrusion, or separated seams
Corrosion extending behind an outer panel into inner structure
How to Fix
Before ordering a panel, have a qualified collision/body technician remove or move the necessary trim and map the corrosion from sound metal to sound metal on both sides of the area. Inspect the inner rocker, pinch weld and jacking areas, floor and reinforcements, nearby mounts, rails, seams, and drain paths. If load-carrying metal or safety-system mounting structure is compromised, stop using the affected lift point and obtain a documented structural repair or retirement decision; an outer cover panel is not the repair. If the damage is limited and the surrounding structure is sound, select the exact ZJ or WJ generation and left or right outer rocker, follow the factory body-repair weld/sectioning guidance, and restore seams, sealers, cavities, coatings, and drainage after welding. Wheel-arch and floor sections should be selected from the body shop's measured cut plan rather than a model-wide shopping list.
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, 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.
Medium ConfidenceVerified0 reportsReviewed Jul 2026
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.
Medium ConfidenceVerified0 reportsReviewed Jul 2026
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.
Medium ConfidenceVerified0 reportsReviewed Jun 2026
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.
Medium ConfidenceVerified0 reportsReviewed Jul 2026
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.
Medium ConfidenceVerified0 reportsReviewed Jul 2026
On the 1999-2004 Jeep Grand Cherokee, on a WJ Grand Cherokee with manual temperature control, the lower blower speeds route through a resistor while the highest speed bypasses it. A blower that still runs on high but loses lower speeds can therefore point toward the resistor circuit, but the factory test also requires checks of the blower switch, wiring, terminals, fuse, and related connections. Automatic Zone Control uses a different electronic power module and is not the same repair. The old card incorrectly combined 1994-2004 generations, manual and automatic HVAC systems, and four possible parts in one shopping list.
Possible heat damage or looseness at the resistor connector
How to Fix
First verify the vehicle is a 1999-2004 WJ with manual temperature control rather than Automatic Zone Control. Confirm which speeds work, inspect the resistor connector and harness for heat damage or loose terminals, and test the blower switch, resistor circuit, power, ground, and blower current draw using the factory wiring information. Replace the resistor only if the test condemns it: 4720278 for the applicable 1999 manual-control vehicle or 5014212AA for the applicable 2000-2004 manual-control vehicle, subject to VIN and connector verification. If the vehicle has Automatic Zone Control, use the AZC self-test and controller circuit procedure instead of ordering either manual-control resistor. Recheck every speed and connector temperature after repair.
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 1999-2010 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 1993-2004 Jeep Grand Cherokee 1993-2004 Rocker, Wheel-Arch or Floor Corrosion - Inspect the Structure First?
Visible corrosion at an outer rocker, rear wheel arch, or floor can range from a limited outer-skin repair to extensive loss of the inner rocker, pinch weld, floor reinforcement, suspension or seat-belt mounting areas, or adjacent unibody structure. A replacement outer panel does… 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 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 1999-2004 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 1999-2009 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 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 1999-2004 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 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 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 1994-2004 Jeep Grand Cherokee 1994-2004 4.0L Oil at the Filter Adapter — Confirm the Leak Before Replacing the Seal Kit?
Oil can collect around the 4.0L oil-filter adapter and travel along the block, but the wettest visible point is not always the source. The prior card correctly pointed owners toward the adapter seals yet overstated how often the leak is misdiagnosed and assigned a single Mopar/Cr… Severity: low.
What is the 1999-2004 Jeep Grand Cherokee 1999-2004 WJ Manual-Climate Blower Works Only on High - Test the Resistor Circuit?
On a WJ Grand Cherokee with manual temperature control, the lower blower speeds route through a resistor while the highest speed bypasses it. A blower that still runs on high but loses lower speeds can therefore point toward the resistor circuit, but the factory test also require… Severity: low.
