Tl* the contact owns a 2006 GMC envoy denali. While driving approximately 60 MPH, the electronic stability control and traction control warning indicators began to illuminate. Immediately there was a substantial reduction in the speed rate. The failure occurred repeatedly whenever the vehicle was in operation. On two separate occasions the engine stalled without prior warning and restarted after…
2006 GMC Envoy engine problems
moderate 28 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Failure mileage
Complaints
28
Recalls
0
Avg fix
$3,100
1fire
When does it fail?
Of the 28 engine complaints filed for the 2006 GMC Envoy, here's the actual mileage breakdown — failures cluster heaviest at 50,000-75,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Owners have filed 28 engine complaints with NHTSA against this vehicle, but no formal recall covers the issue — the federal record reflects what manufacturers have admitted, not everything owners are reporting.
No new NHTSA engine complaint has been filed on this vehicle in over 14 years — the issue may be aging out of the active population.
The failure pattern owners describe
The 2006 GMC Envoy exhibits a pattern of fuel system faults that create highway hazards. The fuel gauge reads empty when the tank is full, or fails to warn when fuel is low. Vehicles stall at stoplights despite adequate fuel, forcing owners to maintain fuel above 1/4 tank to avoid engine shutdown. Replacement fuel sending units and sensors don't permanently fix the issue.
Engine power loss is another recurring complaint. Vehicles shut down abruptly on interstates at 60+ mph with no warning lights, coasting to 10-15 mph while traffic continues around them. Dealers cannot diagnose root cause, and some refuse service claiming the vehicle is too old.
The 5.3L engine shows design issues: DOD lifters fail under normal operation, causing violent vibration and misfire. One owner rebuilt the entire engine with new lifters, yet the same failure recurred 14 months later on a different cylinder. Low oil pressure warnings come and go despite proper maintenance, sometimes preceding catastrophic engine failure requiring full replacement ($5,000+).
Cold starts are rough, with excessive idle speed, whirring noises, and sputtering before settling. Intake manifold gaskets leak, requiring expensive rebuilds. Electrical gremlins include dim lights at stoplights, voltage drops, and melted wiring in the AC blower. Check engine lights illuminate repeatedly with dealers unable or unwilling to identify causes.
Owners across forums report thousands of similar failures, yet no recalls have been issued despite years of complaints.
Same GMC Envoy engine reports on nearby years: 2005 · 2008
Failure modes owners describe
Fuel system and gauge malfunction
Fuel gauge readings erratic or inaccurate, often stuck at empty when tank has fuel; fuel sensor sends false signals causing stalling at low fuel levels even with adequate gas remaining. Vehicle stalls or dies at stoplights when between 1/4 and empty tank, yet fuel light doesn't illuminate. Owners report inability to determine true fuel level, leading to unintended fuel starvation on highways and surface streets.
When: Throughout vehicle's life; reported at various mileages including 79,000 miles and higher
Symptoms owners cite: Fuel gauge reads empty when fuel present; Engine stalls at stoplights despite fuel in tank; Fuel gauge fluctuates or moves erratically; Fuel light does not illuminate when fuel is low; Vehicle dies without warning on highway or busy roads; Check engine light illuminates related to fuel sensor
Codes mentioned: P0457 (implied fuel system leak detection code)
Repairs/costs cited: Fuel sending unit replaced (cost cited: $300 for fuel sensor; owners report multiple replacements). Fuel canister replaced. EVAP sensor replaced. Owners report issues persist after repairs.
Recalls/TSBs owners mention: Recall issued for fuel sending unit, but some dealers refused coverage citing vehicle mileage. No comprehensive recall for faulty gauge or sensor system.
Low oil pressure warning light malfunction / actual engine oil pressure failure
Low oil pressure warning illuminates intermittently or persistently despite confirmed adequate oil level and maintenance. Owners report warning disappears and reappears; mechanics replace oil sending unit but warning recurs. In some cases, low oil pressure is precursor to catastrophic engine failure (knocking, rough startup), requiring full engine replacement.
When: Can occur early in ownership (2008-2012 models); one owner reported at 142,000 miles; another at time of engine failure requiring replacement
Symptoms owners cite: Low oil pressure warning light illuminates; Warning light intermittent, comes and goes; Oil level normal and well-maintained; Engine knock or loud noise upon startup after low pressure warning; Engine no-start or rough running
Codes mentioned: Low oil pressure fault
Repairs/costs cited: Oil sending unit replaced (cost not separately specified). Engine replacement required in at least one case (cost cited: $5,000). Owner found widespread reports on trailblazer/envoy forums of similar failures.
Recalls/TSBs owners mention: No recall noted. Owners cite GM acknowledgment that engine was 'no good' but no warranty repair offered.
DOD/Active Fuel Management lifter failure
Displacement on Demand (DOD) lifters fail, causing cylinder misfires and severe engine vibration. Reported multiple failures on same vehicle: cylinder #6 lifter failed, then after complete engine rebuild with new lifters, cylinder #7 lifter failed 14 months later. Oil pressure to lifter solenoids is insufficient, causing lifter hydraulic failure. Owner rebuilt entire engine to prevent recurrence but second failure occurred regardless.
When: November 2014 (first lifter failure on cylinder #6); March 2016 (second lifter failure on cylinder #7 after rebuild)
Symptoms owners cite: Engine misfire on single cylinder; Violent engine shake while at freeway speed; Check engine light for specific cylinder misfire
Codes mentioned: Cylinder misfire codes (implied P0306 for cylinder #6, P0307 for cylinder #7)
Repairs/costs cited: First repair: complete engine rebuild with new lifters, solenoids, rockers, rocker arms, springs, camshaft (cost: $5,900; completed December 2014). Second repair: single lifter replacement required (cost: $2,500). Owner states this is design flaw, not isolated component failure.
Recalls/TSBs owners mention: No recall. Owner states this should be a recall, not merely a TSB issue.
Unexpected engine shutdown / loss of motive power during highway driving
Engine cuts off abruptly with no warning lights illuminated prior to failure. Vehicle slows from highway speed (60+ mph) to 10-15 mph within 60 seconds. Power returns after sitting a few hours, or in some cases while still coasting. Occurs repeatedly; multiple dealer visits unable to diagnose root cause. One owner reported three separate incidents over several years on interstate during rush hour traffic. Recurs even after dealer repairs and code fixes.
When: Reported 2008, 2012, and later; one owner at 135,000 miles
Symptoms owners cite: Engine powers down with no warning; No check engine light prior to shutdown; Vehicle loses all motive power; Vehicle coasts to 10-15 mph speed; Power returns after sitting idle; Occurs during highway driving at 60+ mph
Codes mentioned: Various codes that clear and reappear; no consistent code identified
Repairs/costs cited: Multiple dealer visits; dealers unable to identify or fix issue. Owners report being told 'we don't know what the problem is' or that vehicle age/mileage makes it unrepairable. Non-dealer mechanic attempted coordinated repair with GMC dealer; issue recurred within 2 days of repair.
Recalls/TSBs owners mention: No recall. Dealers refused to diagnose under warranty, citing vehicle age.
Cold start rough idle and stumble
Upon starting in cold weather, vehicle exhibits very high, loud, high-pitched idle that whines or whirs, then drops to very low idle and sputters. This cycle repeats several times before settling to normal idle. Owner suspects insufficient fuel delivery during cold-start enrichment.
When: Occurs when 'vehicle gets cold' (winter operation implied)
Symptoms owners cite: High-pitched whirring noise during startup; Excessive idle speed; Idle drops very low after high phase; Sputtering during cold-start idle
Repairs/costs cited: No repair cited; owner unsure if fuel system or engine issue.
Intake manifold gasket failure / vacuum leak
Intake manifold gasket leaks, allowing unmetered air and fuel mist into engine causing lean running condition, rough running, and eventual stalling. Replaced manifold gasket resolves issue temporarily in one case but failure recurs. Another owner's intake manifold assembly (part #GM 12571609) failed twice, requiring engine rebuild at significant cost.
When: Reported at 64,000 miles (one owner); intake manifold assembly failures at 9-15-2010 and 4-29-2011
Symptoms owners cite: Check engine light illuminates; Engine runs lean (detected by dealer); Vehicle stalls or dies; Rough running; Loss of power
Codes mentioned: Lean running code (implied O2 sensor related)
Repairs/costs cited: Manifold gasket tightened or replaced (owner report: $3,500 for two intake manifold assembly failures in 2010-2011). Smoke test performed to detect vacuum leak.
Recalls/TSBs owners mention: One dealer advised component must fail before repair attempted. No recall for part #GM 12571609 despite repeated failures.
Throttle body malfunction / loss of throttle response
Upon light brake application to disengage cruise control, vehicle loses power dramatically and unable to accelerate beyond 30 mph. Check engine light illuminates. Requires multiple interventions: throttle body connector rewiring and eventual full throttle body replacement. Issue recurs after repairs.
When: Occurred at least three times per owner report
Symptoms owners cite: Dramatic loss of power after tapping brakes; Check engine light illuminates; Unable to exceed 30 mph; Loss of throttle response
Codes mentioned: Check engine code related to throttle position
Repairs/costs cited: Throttle body connector rewired; throttle body replaced after third incident.
Premature valve seat wear and cylinder head failure
Cylinder head valve seats wear prematurely, causing severe vibration when coming to stop. Affects cylinder sealing and combustion. Mechanic advised cylinder head and valve seats require replacement; owner did not pursue repair due to cost.
When: 98,000 miles (reported mileage when diagnosed)
Symptoms owners cite: Violent shaking when coming to stop; Engine vibration
Repairs/costs cited: Cylinder head valve seats and cylinder would require replacement. Repair not completed; estimated cost not provided by owner.
Electrical fire / melted wiring in heater/AC blower assembly
Smoke emits from air conditioning unit while driving. Upon inspection, owner finds resistor and motor wires melted inside AC unit, indicating electrical overload or short circuit in blower motor assembly.
When: At approximately 100,000 miles
Symptoms owners cite: Smoke from AC unit; Melted resistor and motor wires
Repairs/costs cited: Owner did not pursue repair; no cost cited.
Warm-engine stalling after short idle periods
Vehicle starts and runs normally in morning when cold. Once engine warms during errands, vehicle stalls. Stalling resolves after 10-minute cool-down period. Requires owner to drive quickly to safe area or home to allow engine to cool. Recurs frequently.
When: Occurs after engine reaches operating temperature
Symptoms owners cite: Stalling when engine is warm; No stalling when cold-started; Resolves after cool-down period
Repairs/costs cited: Multiple shop visits; no resolution described.
Electrical charging system failure / voltage drop at idle
Vehicle loses voltage when idling or stopped at traffic lights, causing instrument panel lights to dim and battery voltage to drop to 10 volts, sometimes triggering stall. Voltage is normal while driving. New battery and alternator testing performed by multiple shops confirmed both are functional; root cause unidentified.
When: Reported at 80,000 miles on a 3-year-old vehicle
Symptoms owners cite: Voltage loss at idle and stoplights; Instrument panel lights dim; Battery voltage drops to 10 volts; Vehicle stalls occasionally; Problem developed suddenly after 2 months of normal operation
Repairs/costs cited: New battery installed at Sears; alternator tested good at AutoZone and Pep Boys; all connections tested good. Root cause not identified.
Recalls/TSBs owners mention: GMC dealer (Darcy Motors, Joliet, IL) stated this is normal and all Envoys experience this.
Check engine light illumination without drivability issues
Check engine light illuminates during operation with no apparent drivability symptoms, but vehicle has not been diagnosed or repaired.
When: At 104,000 miles (one report)
Symptoms owners cite: Check engine light illuminated
Repairs/costs cited: No diagnosis or repair attempted.
Misfire (multiple cylinders)
Engine misfires on cylinder #1 (P0301) and possibly others. Extensive diagnostics rule out spark wires, coils, and fuel pressure. Compression tested good. Root cause not identified despite $1,100+ in diagnostic and repair costs.
When: Reported on 2006 GMC Denali with 5.3L engine
Symptoms owners cite: Engine misfire; Rough running
Codes mentioned: P0301 (cylinder #1 misfire)
Repairs/costs cited: Spark wires checked, coils checked, fuel checked, compression verified good. Cost: $1,100+ with no resolution.
Reduced power mode activation / limp home mode
Reduced power light illuminates while driving on highway, forcing engine into severe power limiting mode. Vehicle cannot accelerate normally. Occurs repeatedly despite engine replacement under warranty. At one report, engine had only 8,000 miles since replacement.
When: Occurs repeatedly; reported shortly after engine replacement under warranty
Symptoms owners cite: Reduced power light illuminates; Severe loss of power and acceleration; Vehicle in limp home mode
Codes mentioned: Reduced power / limp home mode activation
Repairs/costs cited: Engine replaced under warranty; issue recurs within 8,000 miles of new engine.
Recalls/TSBs owners mention: Engine replacement covered under warranty; however, issue persists with replacement engine.
Electronic stability control and traction control malfunction
ESC and traction control warning lights illuminate continuously and repeatedly while vehicle is in operation. Immediately upon illumination, vehicle experiences substantial speed reduction (limp mode). Engine stalls without warning on two occasions and restarts after brief wait. ECM reprogramming attempted but issue recurs.
When: At approximately 67,000 miles
Symptoms owners cite: ESC warning light illuminates; Traction control warning light illuminates; Substantial speed reduction triggered; Engine stalls without prior warning; Lights illuminate repeatedly whenever vehicle is operated
Codes mentioned: Electronic stability control faults, Traction control faults
Repairs/costs cited: ECM reprogrammed by authorized dealer at seven separate visits. No other repairs performed.
Recalls/TSBs owners mention: Manufacturer notified; ECM reprogramming performed but issue not resolved.
Engine vibration and stalling with check engine light
Vehicle vibrates and stalls intermittently at low speeds. Check engine light illuminates prior to failures. Dealer replaces intake valve, head gasket, timing belt, and cylinder head as corrective action, but failures recur. Vehicle is not driven due to safety risk.
When: At 14,000 miles with failures recurring by 16,000 miles
Symptoms owners cite: Engine vibration at approximately 30 mph; Engine stalls intermittently; Check engine light illuminates
Codes mentioned: Check engine code related to cylinder head or valves
Repairs/costs cited: Intake valve replaced, head gasket replaced, timing belt replaced, cylinder head replaced. All components new; failures recurred.
Dropped or stuck valve
Valve drops or sticks in engine, causing mechanical failure.
When: Reported on 2006 GMC Envoy Denali; specific mileage not provided
Symptoms owners cite: Dropped valve
Repairs/costs cited: No detail provided.
Cold start delay / hard start with poor acceleration for 3 minutes
Upon cold start, vehicle does not accelerate smoothly. Accelerator pedal must be depressed fully to the floor for vehicle to move. Loud noise occurs during first 3 minutes of driving. After 3-minute warm-up period, normal acceleration begins. Dealer could not duplicate issue but eventually identified clutch fan cooling the engine as source of noise; acceleration problem cause remained unidentified.
When: Reported at early ownership (2006 model year)
Symptoms owners cite: Poor cold-start acceleration; Loud noise during first 3 minutes of driving; Accelerator pedal must be fully depressed to floor
Repairs/costs cited: Clutch fan identified as noise source by dealer; unable to determine cause of acceleration problem.
Recalls/TSBs owners mention: Manufacturer advised that this acceleration pattern is normal for the vehicle.
Air suspension compressor leak / vehicle ride height sagging overnight
2006 GMC Envoy Denali with air suspension system experiences overnight sagging. Vehicle drops to low-rider stance overnight due to air compressor leak. Upon starting, compressor pressurizes system and vehicle returns to normal height within 3-4 minutes.
When: Reported on 2006 GMC Envoy Denali
Symptoms owners cite: Vehicle sagging overnight; Low-rider appearance in morning; Compressor cycles on to restore height after starting
Repairs/costs cited: No repair cited or cost provided.
Excessive oil consumption
Engine consumes 2-3 quarts of oil per 30-day period with no visible leaks or exhaust smoke. Owner suspects internal wear or burning. Engine eventually collapsed a lifter and push rod. Similar engine in 2003 Pontiac was recalled, but no recall issued for Envoy.
When: Reported on 2006 GMC Envoy Denali; oil consumption began before lifter collapse
Symptoms owners cite: Oil level drops 2-3 quarts per month; No visible leaks; No exhaust smoke; Lifter collapse / push rod failure
Repairs/costs cited: Lifter and push rod collapsed requiring engine repair. Cost not specified.
Recalls/TSBs owners mention: No recall; owner notes same engine in 2003 Pontiac was recalled.
Timing chain failure
Timing chain fails, requiring replacement. Reported as one of multiple major failures on a single 2006 Envoy.
When: No specific mileage provided
Symptoms owners cite: Timing chain failure
Repairs/costs cited: Timing chain replaced; cost not separately specified in multi-repair list.
Oil pump failure
Oil pump fails or is defective. Vehicle will not hold oil pressure after repair.
When: Reported on 2006 GMC Envoy; specific mileage not provided
Symptoms owners cite: Oil pump failure; Unable to hold oil pressure
Repairs/costs cited: Oil pump replaced or repaired; vehicle still unable to hold oil pressure.
Engine cooling system malfunction / overheating with shutdown
Engine cooling light illuminates while driving, and engine shuts down immediately as a safety measure.
When: Early ownership (2005-2006 model year)
Symptoms owners cite: Engine cooling warning light illuminates; Engine shuts down
Repairs/costs cited: Dealer corrected the problem with 'engine cooling' (specific repair not detailed).
Synthesized from 28 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 2 most recent
Vehicle has been losing voltage when car is started and in idle position. When car is driving the voltage is always reading ok but when your at a stop light then all the instrument lights dim and the battery gets down to 10 and sometimes the car starts to stall. Brought the car to darcy motors in joliet, il and they said its normal and the envoys experience this. I don't believe this and the car…
Had engine trouble with your 2006 GMC Envoy?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the engine problem on the 2006 GMC Envoy?
It's a documented issue but not catastrophic. 28 complaints have been filed. Repairs average $3,100 and most owners catch it before it causes a breakdown.
At what mileage does the engine typically fail?
Across the 22 complaints that reported odometer mileage, most engine failures cluster between 72,000 and 120,000 miles, with the median around 104,000. A quarter of owners report trouble before 72,000; a quarter make it past 120,000. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $3,100 for engine repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to engine?
No active recalls currently cover engine issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2006/GMC/Envoy.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.