This service bulletin provides guidelines and diagnostic/repair information to technicians regarding vehicle engine oil consumption.
full bulletin at NHTSA ↗2005 Pontiac G6 engine problems
severe 16 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Failure mileage
Complaints
16
Recalls
0
Avg fix
$3,100
1fire
When does it fail?
Of the 16 engine complaints filed for the 2005 Pontiac G6, here's the actual mileage breakdown — failures cluster heaviest at 100,000-125,000 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
No new NHTSA engine complaint has been filed on this vehicle in over 13 years — the issue may be aging out of the active population.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering engine on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
This technical bulletin advises of a new fuel injection cleaner kit used for decarbonizing the intake valves to correct conditions of rough idle, Crank no start, extended crank or misfire, MIL with DTCs, and explains how Top Tier fuels should be used to reduce carbon build-up.
full bulletin at NHTSA ↗This service bulletin provides service information to technicians on guidelines to replace Oil Cooler, Oil Cooler Lines and Oil Tank if the engine was replaced where large amounts of debris has flowed throughout the oiling system.
full bulletin at NHTSA ↗This PI bulletin advises the technician on the proper way to install the pistons in an engine.
full bulletin at NHTSA ↗This service bulletin provides a vibration analysis worksheet the technician can use in conjunction with the appropriate Vibration Analysis-Road testing procedure when diagnosing vibration concerns.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Starting troubles dominate these complaints. Owners describe the engine overstarting (cranking excessively as if the ignition was held too long) and then dying, or continuing to crank repeatedly after initial firing. One owner reports this happens nearly every morning since the car was brand new, yet dealerships run computer diagnostics and find nothing wrong. An independent technician replaced a valve per one GMAC inspection; the problem persisted.
Beyond starting, owners report the engine hesitates, sputters, and requires foot-on-gas to catch. A few describe slow, sluggish cranking and dragging at startup.
Misfiring occurs at highway speeds with check engine lights that recur after independent repair. Several owners face sudden power reduction warnings followed by engine shutdown while driving—some report five shutdowns in 30 minutes, stranding them at traffic lights and stop signs. One owner lost both power steering and acceleration simultaneously at 45 mph.
Fuel-system problems include strong gasoline odor with no clear cause (multiple owners report the same issue), fuel leaks, and check-gas-cap warnings that persist after cap replacement.
A dealership diagnosed rod and piston failure at unknown mileage, estimating 5,000 miles to complete engine failure. Another owner watched flames erupt under the hood while stopped at a light (210,000 miles). One narrative mentions excessive morning condensation and an occasional failure to start in cold conditions.
Same Pontiac G6 engine reports on nearby years: 2007 · 2008
Failure modes owners describe
Hard Start / Overshooting Starter / Repeated Cranking
Engine cranks excessively on initial start, as if ignition key is held too long, or continues attempting to start after engine fires. Engine then dies. Occurs nearly every morning. One owner reports 700 failures. Dealership could not reproduce. One independent technician cited a valve replacement; issue persisted after repair.
When: Morning starts, less than 1 month old to multiple years of ownership
Symptoms owners cite: Overshooting starter / excessive cranking; Repeated cranking attempts after engine fires; Engine dies after hard start; Computer scan shows no fault
Repairs/costs cited: Valve replaced per independent technician recommendation (GMAC); problem continued
Recalls/TSBs owners mention: Dealership unable to diagnose; GMAC sent independent technician
Misfiring / Check Engine Light / Emissions Issue
Engine misfires while driving at highway speeds (70–75 mph). Check engine light illuminates. Independent mechanic diagnosed emissions and cooling system involvement. Problem recurred after repair; check engine light reappeared two days later. Recurring at high mileage (174,000 miles).
When: At 174,000 miles, during highway driving
Symptoms owners cite: Misfiring while driving; Check engine light illuminates; Recurrence after repair; Check engine light returns within days
Repairs/costs cited: Repaired by independent mechanic for emissions and cooling system; failure recurred
Engine Power Reduction / Limp Mode / Complete Shutdown
Display shows 'Engine Power Has Been Reduced' followed by motor disablement. Occurs multiple times per day (up to 5 times in 30 minutes). Requires shutdown and restart. Leaves vehicle stranded in traffic, stoplights, and stop signs, creating hazard.
When: Recurring throughout driving; frequency varies
Symptoms owners cite: Dashboard message 'Engine Power Has Been Reduced'; Motor disabled without warning; Vehicle stranded and must be restarted; Recurs up to multiple times daily
Complete Power Steering and Acceleration Loss
Loss of power steering and loss of acceleration while driving on busy street. Dashboard display reads 'Power Steering Engine Disabled.' Vehicle dropped from 45 mph to complete stop. Emergency lights remained functional.
When: During normal driving on busy road
Symptoms owners cite: Complete loss of power steering; Complete loss of acceleration; Dashboard message 'Power Steering Engine Disabled'; Sudden deceleration to zero mph
Engine Stall Without Warning Lights
Vehicle stalls without illumination of warning lights. Starts immediately after stalling. Dealership unable to diagnose despite multiple visits.
When: Intermittent, timing unknown
Symptoms owners cite: Engine stalls without warning; No warning lights present; Immediate restart successful
Repairs/costs cited: Dealership unable to diagnose
Rough Idle / Hesitation / Sputtering Start
Engine hesitates at startup or sputters before catching. Owner must keep accelerator pressed to make engine catch and start. Suggests idle adjustment needed. Does not always start on first try.
When: At startup
Symptoms owners cite: Engine hesitates on startup; Sputtering before engine catches; Multiple cranking attempts needed; Requires foot on accelerator to start
Slow Cranking / Engine Drag at Start
When vehicle is started, engine drags and cranks slowly. Turns over sluggishly.
When: At startup
Symptoms owners cite: Engine drags during cranking; Slow to turn over; Sluggish starter engagement
Fuel Odor / EVAP System Leak
Very strong gasoline odor from tank area, present whether car is running or stopped. 'Check Gas Cap' warning displayed even after cap replacement. Owner replaced cap, checked evaporative solenoid, gaskets, and tank tubing; odor worsened. Multiple 2005 G6 owners report same issue with no confirmed cause identified.
When: Persistent over time
Symptoms owners cite: Strong gasoline odor from tank area; Odor worse when parked; Check Gas Cap warning light; Odor persists after cap replacement
Repairs/costs cited: Replaced gas cap, checked evaporative solenoid, gaskets, tubing; odor worsened
Fuel Leak
Gasoline leaks from fuel system. Heavy raw gasoline smell when vehicle is off.
When: Intermittent, parked
Symptoms owners cite: Fuel leaking; Heavy raw gasoline smell when parked
Engine Noise / Rod and Piston Failure
Abnormal dinging or noise heard under the hood. Dealership diagnosed rod and piston failure. Owner advised only 5,000 miles remaining before total engine failure.
When: 161,000 miles reported in one narrative; unknown in another
Symptoms owners cite: Abnormal dinging noise under hood; Engine deceleration with noise; Rod and piston wear detected
Repairs/costs cited: Dealership diagnosis: rods and pistons failing; estimated 5,000 miles until total failure
Engine Rollback / Stall / Auto-Restart
Vehicle made abnormal dinging noise and decelerated. After a few seconds, vehicle rolled and restarted on its own when accelerator pedal was depressed. Check engine and all warning indicators illuminated.
When: 161,000 miles
Symptoms owners cite: Abnormal dinging noise; Vehicle deceleration; Vehicle rolls and restarts when accelerator pressed; Check engine light illuminates; All warning indicators illuminate
Recalls/TSBs owners mention: Not made aware; vehicle not diagnosed or repaired
Engine Fire
Flames observed under hood while vehicle was at stop light. Driver moved vehicle to parking area and fire department extinguished fire. Vehicle towed away. Cause not determined.
When: 210,000 miles
Symptoms owners cite: Flames under hood; Fire requiring fire department response
Recalls/TSBs owners mention: Not contacted by owner; dealership notified
Condensation / Start Failure in Cold Weather
Excessive condensation on windshield and side windows upon entering vehicle in mornings. On one occasion, vehicle unable to start. Not diagnosed or repaired.
When: 122,000 miles
Symptoms owners cite: Excessive morning condensation; Occasional failure to start
Recalls/TSBs owners mention: Manufacturer made aware; not repaired
Idle Control / Transmission Creep
When car is put in Drive, it wants to move at fast speed even with foot off brake. Suggests idle control issue.
When: Unknown timing
Symptoms owners cite: High idle in Drive; Vehicle creeps forward without brake applied
Synthesized from 16 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 2 most recent
I smelled a very strong odor of gas as I walked up to my car. The check gas cap display came on. I replaced the gas cap and warning is still displayed. The smell of gas has continued to worsen and seems to be coming from the gas tank. It doesn't matter if the car is running or not. I have researched and found many owners of the same year and make car are having the same problem however, nobody…
I purchased my 2005 Pontiac g6 jan. 10, 2005. This car is having issues starting first thing. It will either over start like I held the ignition too long or it will keep trying to start once it has been started. In both cases, the engine will die. I have been notifying the dealership about this issue since the car was less than a month old. Each time, it was brought into the dealership, ran on…
Had engine trouble with your 2005 Pontiac G6?
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 2005 Pontiac G6?
It's a meaningful issue. 16 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $3,100.
At what mileage does the engine typically fail?
Across the 12 complaints that reported odometer mileage, most engine failures cluster between 94,000 and 169,000 miles, with the median around 120,000. A quarter of owners report trouble before 94,000; a quarter make it past 169,000. 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/2005/Pontiac/G6.
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.