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GMC · Known Issues

2002 GMC Envoy Problems: 3 Known Issues

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

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Issue summary

According to Au7o's analysis of 1,010+ owner reports, the 2002 GMC Envoy has 3 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 with published estimates, repair costs range from $80 to $1,500. DIY maintenance guides at au7o.io.

In This Article

  • Envoy Engine1
  • Envoy Cooling1
  • Envoy Drivetrain1
  • Recalls10
  • FAQ
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In This Article

  • Engine1
  • Cooling1
  • Drivetrain1
  • Recalls10
  • FAQ

All 3 Known Issues

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ALL YEARS20092008200720062005200420032002
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: Cadillac DeVille, Cadillac Eldorado, 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 you need to fix it

Only diagnosis- and fitment-reviewed repair parts are linked here.

  • Engine Crankshaft Position Sensor
    Cross-ref235-1078

    Fitment confirmed against the ShowMeTheParts catalog for this vehicle's year and engine.

    eBayAmazon

As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

Typical repair cost:$80 - $300

Research This Issue

Based on 540 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
High Confidence540 owner 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: Chevrolet Corvette, Chevrolet Sonic

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.

Typical repair cost:$200 - $500

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
Medium Confidence
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).

This issue also affects: Cadillac Escalade ESV, Chevrolet Silverado 2500HD, Chevrolet Silverado 1500

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.

Typical repair cost:$200 - $1,500

Research This Issue

Based on 470 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
High Confidence470 owner reportsLast reported by owners Feb 2026Reviewed Feb 2026
NHTSA Recalls10 recalls

VISIBILITY:WINDSHIELD

CERTAIN SPORT UTILITY VEHICLES FAIL TO COMPLY WITH THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 212, 'WINDSHIELD MOUNTING.' THE WINDSHIELD URETHANE BEAD MAY NOT HAVE ADHERED TO THE BODY IN CERTAIN AREAS DURING THE CURE PROCESS.

Campaign #05V03500003/02/2005

EXTERIOR LIGHTING:HEADLIGHTS

CERTAIN MAXZONE HEADLIGHT ASSEMBLIES, DEPO BRAND, P/NO 335-1120L-AS, SOLD FOR USE AS AFTERMARKET EQUIPMENT FOR THE ABOVE LISTED PASSENGER VEHICLES. DURING PRODUCTION THE LAMP HOUSING SHAPE DEFORMED DISTORTING THE ASSEMBLY ANGLE OF THE REFLECTOR AND INFLUENCED THE AIMING POSITION. THESE HEADLAMPS FAIL TO CONFORM TO THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 108, LAMPS, REFLECTIVE DEVICES, AND ASSOCIATED EQUIPMENT.

Campaign #07E01400026/02/2007

AIR BAGS:FRONTAL

CERTAIN VEHICLES ORIGINALLY BUILT WITH CLOTH SEATS THAT WERE EQUIPPED WITH AN AUTOMATIC AIR BAG PASSENGER SENSING SYSTEM AND LATER REUPHOLSTERED WITH AFTERMARKET LEATHER SEAT COVER KITS ARE INVOLVED. TESTING HAS INDICATED THAT THE AFTERMARKET LEATHER SEAT COVERS CAN CAUSE THE PASSENGER SENSING SYSTEM TO MALFUNCTION.

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Frequently Asked Questions

What are the most common GMC Envoy problems?

According to Au7o's analysis of 1,010+ owner reports, the 2002 GMC Envoy has 3 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 GMC Envoy has 3 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 $80 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.

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.

Data sourced from 1,010+ owner reports, NHTSA recalls, TSBs, and automotive forums.

Campaign #06V41700031/10/2006

VISIBILITY:POWER WINDOW DEVICES AND CONTROLS

General Motors LLC (GM) is recalling certain model year 2006-2007 Buick Rainier, Chevrolet Trailblazer and GMC Envoy vehicles, and 2006 GMC Envoy XL and Chevrolet Trailblazer EXT vehicles. Fluid may enter into the driver's door master power window switch module, causing corrosion that could result in a short in the circuit board, causing window switches to become inoperative. Previously, the affected vehicles may have had their master power window switch module treated with a protective coating, instead of having it replaced.

Campaign #15V59900024/09/2015

EXTERIOR LIGHTING:HEADLIGHTS

General Motors LLC (GM) is recalling certain model year 2007 Pontiac Grand Prix, 2006-2009 Buick LaCrosse, 2006-2007 Buick Rainier, Chevrolet Trailblazer, GMC Envoy, 2006 Chevrolet Trailblazer EXT, GMC Envoy XL, 2006-2008 Isuzu Ascender, and Saab 9-7x vehicles. In the affected vehicles, the headlamp driver module (HDM) may overheat and fail, causing the headlamps and daytime running lights to not illuminate.

Campaign #15V51900014/08/2015

+ 5 more recalls. Check all on NHTSA.gov

Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.

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.