2002 GMC Envoy Problems: 4 Issues Every Owner Should Know

2002 model year · 1,010+ owner reports · Updated April 2026

According to Au7o's analysis of 1,010+ owner reports, the 2002 GMC Envoy has 4 documented known issues, with 2 rated critical. The most serious are 4.2L I6 Crankshaft Position Sensor Failure and Stalling ($80-$300 repair) and Electric Cooling Fan Clutch Failure ($200-$500 repair). The most commonly reported issue is 4.2L I6 Crankshaft Position Sensor Failure and Stalling with 540 owner reports. Across all issues, repair costs range from $20 to $1,500. DIY maintenance guides at au7o.io.

All 4 Known Issues

Filter:

Community Reported

540 owners

On the 2002-2009 GMC Envoy 4.2L I6 LL8, the 4.2L LL8 inline-6 engine in the 2002-2009 GMC Envoy is notorious for crankshaft position sensor failures that cause intermittent stalling and no-start conditions. The sensor is located on the side of the engine block and is exposed to heat soak from the exhaust manifold, accelerating its failure. A failing sensor causes the PCM to lose track of crank position, resulting in the engine cutting out without warning — often at highway speed. The issue tends to be intermittent at first, making diagnosis challenging. Replacement is straightforward and the part is inexpensive.

This issue also affects: Acura MDX, BMW X2, Cadillac Fleetwood

Common Symptoms

Engine stalls without warning at any speed
Hard start or no-start after hot soak
Check engine light with code P0335 or P0336
Engine cranks but won't fire when hot
Intermittent stall that restarts after cooling down
Rough idle followed by stall

How to Fix

Replace crankshaft position sensor (ACDelco 213-3521 or Delphi SS11378). Clear codes and test. If stalling continues, inspect camshaft position sensor (ACDelco 213-3522) as secondary cause. Verify PCM software is current — older PCM calibrations make the engine overly sensitive to sensor signal dropout.

What Owners Are Using

Parts and tips from 540+ owners who fixed this issue

UpgradeACDelco 213-3521 crankshaft position sensor for 2002-2009 Envoy 4.2L — this is an easy, high-confidence first repair when stalling or no-start is present. The ACDelco OE replacement includes the updated sensor body with better heat resistance than the original. Install takes under 30 minutes with an 11mm socket. Cost is $45-80. This single repair resolves stalling on approximately 70% of Envoys with these symptoms per GMCForum.com members. (ACDelco #213-3521)
View on Amazon
TipThe 4.2L crankshaft sensor failure is heat-related — the sensor typically fails after the engine reaches full operating temperature, not on a cold start. If the Envoy stalls only when hot and starts fine when cold, the crank sensor is the primary suspect. Carry a spare (they're $40-80) if you rely on the Envoy for daily use — a failed sensor in traffic is stranding you for a tow. Install takes 25 minutes roadside if needed.
NoteAn engine stalling at highway speed in a 2002-2009 Envoy can cause power steering and brake boost loss simultaneously (both are engine-vacuum dependent on the LL8). Practice the no-power steering/brakes procedure: steer with significantly more force and pump the brakes with extra pressure. Pull to the right shoulder immediately if the engine cuts out at speed. Do not attempt to restart while moving.

Typical repair cost:$80 - $300

Research This Issue

540+ owners have reported this issue

Google Reddit YouTube NHTSA

Community Reported

High Confidence540 reportsLast reported by owners Feb 2026Reviewed Feb 2026

On the 2002-2009 GMC Envoy, the electronically controlled fan clutch fails, causing overheating in traffic or at low speeds. The Envoy uses a clutch-type fan rather than electric fans, and the electronic control module in the clutch is the weak point.

This issue also affects: Infiniti FX50, Infiniti M56, Chevrolet Trailblazer

Common Symptoms

Overheating in traffic
Temperature gauge climbs at idle
Fan runs at full speed constantly
A/C performance poor at idle

How to Fix

Replace fan clutch assembly (Hayden 3262). Some owners upgrade to a dual electric fan conversion for more reliable cooling. Ensure coolant system is flushed and thermostat is functioning properly.

What Owners Are Using

Parts and tips from 0+ owners who fixed this issue

UpgradeTYC cooling fan assembly — complete bolt-on replacement (TYC Cooling Fan Assembly)
View on Amazon
UpgradeDorman cooling fan motor — OE replacement (Dorman Cooling Fan Motor)
View on Amazon

Typical repair cost:$200 - $500

Research This Issue

0+ owners have reported this issue

Google Reddit YouTube NHTSA

Community Reported

Medium Confidence0 reportsLast reported by owners Invalid DateReviewed Invalid Date

Community Reported

470 owners

On the 2002-2009 GMC Envoy, the 2002-2009 Envoy uses the BorgWarner 4482 (Auto-Trak) transfer case with an electric encoder motor for 4WD engagement. The encoder motor and its associated hall-effect position sensor fail regularly between 80,000-120,000 miles, causing 4WD to not engage, 4WD warning lights, and the truck occasionally shifting to neutral while driving. The front axle disconnect actuator also fails, causing a grinding or chirping from the front differential in 2WD mode when the axle doesn't fully disengage. Both issues are well-documented on GMT360 platform vehicles (Trailblazer, Rainier, Bravada).

Common Symptoms

4WD will not engage — light flashes but doesn't solidify
Service 4WD or 4WD Off message on DIC
Grinding or chirping from front axle at highway speed
Transfer case drops to neutral while driving (dangerous)
4WD indicator cycles but no engagement felt
Clunking when attempting to engage 4WD

How to Fix

Replace encoder motor (ACDelco D1956A or Dorman 600-900). Replace front axle actuator if grinding present (Dorman 600-115). Change transfer case fluid (ACDelco Auto-Trak II, 88900402). Check for corroded wiring harness to encoder motor — a common no-fix-needed finding.

What Owners Are Using

Parts and tips from 470+ owners who fixed this issue

UpgradeDorman 600-900 transfer case encoder motor for 2002-2009 Envoy/Trailblazer — direct OEM replacement at roughly half the GM dealer price ($120-160 vs $250-350). The encoder motor is a 30-minute DIY replacement on the BorgWarner 4482 — three bolts and two connectors. Comes with updated sealing to prevent moisture intrusion into the motor housing, which is the root cause of GM original encoder motor failure. (Dorman #600-900)
View on Amazon
TipBefore replacing the encoder motor, check the transfer case fluid level and condition (ACDelco Auto-Trak II, 88900402). Low or contaminated fluid is the leading cause of encoder motor position sensor errors. Drain and refill the transfer case ($30-50 in fluid) before condemning the motor — approximately 20% of 4WD engagement issues on Envoy are resolved by fresh fluid alone per GMCForum.com forum threads.
NoteA transfer case dropping to neutral while driving on the 2002-2009 Envoy is the same safety-critical failure as documented in NHTSA recall 14V-461 on later GM trucks. If your Envoy has spontaneously shifted to neutral while driving, stop using 4WD until the encoder motor and TCCM (Transfer Case Control Module) are both inspected. The TCCM can also command neutral shifts when it receives corrupted position data — a wiring harness issue rather than a mechanical one.

Typical repair cost:$200 - $1,500

Research This Issue

470+ owners have reported this issue

Google Reddit YouTube NHTSA

Community Reported

High Confidence470 reportsLast reported by owners Feb 2026Reviewed Feb 2026

On the 2002-2009 GMC Envoy, instrument cluster stepper motors fail, causing gauges (speedometer, tachometer, fuel, temperature) to read incorrectly or stick. This is a common GM issue with the X27.168 stepper motors used in this generation of clusters.

Common Symptoms

Speedometer reads wrong
Gauges stick or bounce
Fuel gauge inaccurate
All gauges fail simultaneously

How to Fix

Replace stepper motors in the instrument cluster. DIY kits with replacement X27.168 or X25.168 stepper motors and soldering tools are available for $20-30. Alternatively, send cluster to a rebuild service.

What Owners Are Using

Parts and tips from 0+ owners who fixed this issue

UpgradeProfessional Bluetooth OBD-II scanner for reading electrical system fault codes (BlueDriver Bluetooth Pro OBD2 Scan Tool)
View on Amazon
UpgradeAutomotive digital multimeter for diagnosing electrical faults and testing circuits (Innova 3340 Automotive Digital Multimeter)
View on Amazon
UpgradeElectrical contact cleaner for restoring connections and preventing corrosion (CRC QD Electronic Cleaner)
View on Amazon

Typical repair cost:$20 - $250

Research This Issue

0+ owners have reported this issue

Google Reddit YouTube NHTSA

Community Reported

Medium Confidence0 reportsLast reported by owners Invalid DateReviewed Invalid Date

Frequently Asked Questions

What are the most common GMC Envoy problems?

According to Au7o's analysis of 1,010+ owner reports, the 2002-2002 GMC Envoy has 4 documented issues. The most frequently reported are: 4.2L I6 Crankshaft Position Sensor Failure and Stalling, Electric Cooling Fan Clutch Failure, Transfer Case Encoder Motor and Front Axle Actuator Failure. Of these, 2 are rated critical and should be addressed promptly.

Is the GMC Envoy reliable?

The 2002-2002 GMC Envoy has 4 known issues documented across 1,010+ owner reports. 2 issues are rated critical: 4.2L I6 Crankshaft Position Sensor Failure and Stalling and Electric Cooling Fan Clutch Failure. 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 GMC Envoy problems?

Repair costs for known GMC Envoy issues range from $20 to $1,500, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, 4.2L I6 Crankshaft Position Sensor Failure and Stalling, typically costs $80-$300 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2002-2009 GMC Envoy 4.2L I6 Crankshaft Position Sensor Failure and Stalling?

The 4.2L LL8 inline-6 engine in the 2002-2009 GMC Envoy is notorious for crankshaft position sensor failures that cause intermittent stalling and no-start conditions. The sensor is located on the side of the engine block and is exposed to heat soak from the exhaust manifold, acce… Repairs typically run $80-$300. Severity: high.

What is the 2002-2009 GMC Envoy Electric Cooling Fan Clutch Failure?

The electronically controlled fan clutch fails, causing overheating in traffic or at low speeds. The Envoy uses a clutch-type fan rather than electric fans, and the electronic control module in the clutch is the weak point. Repairs typically run $200-$500. Severity: high.

What is the 2002-2009 GMC Envoy Transfer Case Encoder Motor and Front Axle Actuator Failure?

The 2002-2009 Envoy uses the BorgWarner 4482 (Auto-Trak) transfer case with an electric encoder motor for 4WD engagement. The encoder motor and its associated hall-effect position sensor fail regularly between 80,000-120,000 miles, causing 4WD to not engage, 4WD warning lights, a… Repairs typically run $200-$1,500. Severity: medium.

What is the 2002-2009 GMC Envoy Instrument Cluster Gauge Failure?

Instrument cluster stepper motors fail, causing gauges (speedometer, tachometer, fuel, temperature) to read incorrectly or stick. This is a common GM issue with the X27.168 stepper motors used in this generation of clusters. Repairs typically run $20-$250. Severity: low.

2002 GMC Envoy Problems: 4 Issues Every Owner Should Know

All 4 Known Issues

2002-2009 GMC Envoy: 4.2L I6 Crankshaft Position Sensor Failure and Stalling#

Common Symptoms

How to Fix

What Owners Are Using

Research This Issue

2002-2009 GMC Envoy: Electric Cooling Fan Clutch Failure#

Common Symptoms

How to Fix

What Owners Are Using

Research This Issue

2002-2009 GMC Envoy: Transfer Case Encoder Motor and Front Axle Actuator Failure#

Common Symptoms

How to Fix

What Owners Are Using

Research This Issue

2002-2009 GMC Envoy: Instrument Cluster Gauge Failure#

Common Symptoms

How to Fix

What Owners Are Using

Research This Issue

Other GMC Models

Frequently Asked Questions

What are the most common GMC Envoy problems?

Is the GMC Envoy reliable?

How much does it cost to fix common GMC Envoy problems?

What is the 2002-2009 GMC Envoy 4.2L I6 Crankshaft Position Sensor Failure and Stalling?

What is the 2002-2009 GMC Envoy Electric Cooling Fan Clutch Failure?

What is the 2002-2009 GMC Envoy Transfer Case Encoder Motor and Front Axle Actuator Failure?

What is the 2002-2009 GMC Envoy Instrument Cluster Gauge Failure?