Tl*the contact owns a 2008 GMC acadia. While driving approximately 45-60 MPH the vehicle stalled. He stated that the vehicle stalled and within a couple of seconds the vehicle started moving in reverse. The following day, the vehicle would not start and the vehicle was towed to an authorized dealer. The dealer was unable to duplicate the failure. The failure occurred twice after the dealer…
2008 GMC Acadia engine problems
severe 59 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Failure mileage
Complaints
59
Recalls
0
Avg fix
$3,100
3fires
2injuries
When does it fail?
Of the 59 engine complaints filed for the 2008 GMC Acadia, here's the actual mileage breakdown — failures cluster heaviest at 0-25,000 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 59 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.
Among the 18 model years of GMC Acadia in our records for engine problems, this one ranks #2 by owner-complaint volume.
The failure pattern owners describe
Buyer takeaway: The 2008 GMC Acadia has serious, widespread engine and transmission issues that owners report dealers struggle to diagnose—timing chains fail prematurely, power loss occurs without warning in traffic, and some vehicles have caught fire. Repairs are expensive ($2,000–$4,000), warranty coverage is often denied, and GM has not issued a recall for the 2008 model year despite doing so for adjacent model years.
Owners describe two dominant failure patterns in the 2008 GMC Acadia engine. The first is premature timing chain wear and failure, appearing across dozens of complaints. Owners report check engine lights followed by dealer diagnosis of stretched or worn timing chains requiring replacement—typically at 50,000 to 105,000 miles—at costs around $2,000 to $3,700. Several owners note the dealer offered timing chain replacement for 2007 and 2009 model years via recall, yet refuse coverage for the 2008, despite identical complaints. Some chains have snapped or jumped timing entirely, causing pistons to fall out, catastrophic engine damage, smoke, stalling mid-highway, and one documented engine fire.
The second major pattern involves sudden loss of engine power or driveline lockup during acceleration or highway driving. Owners report the vehicle refusing to accelerate past 15–25 mph, stalling without warning, or losing power entirely. Warning lights frequently appear together: check engine, reduced power, service stabilitrak, traction control off. Dealers often blame transmission solenoids, throttle body moisture, or shift modules (code P0700), though some cannot locate a cause and return the vehicle unrepaired. A few owners describe the engine revving uncontrolled then dropping to minimal speed. In at least one incident, the vehicle caught fire at speed.
Additional engine concerns include oil leaks from timing cover seals, excessive oil consumption, abnormal ticking, coolant leaks entering the cabin and ventilation system, and exhaust fumes backing into the passenger compartment. Owners report frustration that GM denies coverage, cites maintenance history or dealer service gaps, or claims these are "command problems" (inherent design issues) rather than defects.
Same GMC Acadia engine reports on nearby years: 2007 · 2009 · 2010 · 2011
Failure modes owners describe
Premature timing chain wear and stretch
Timing chain wears, stretches, or snaps before normal service life, causing check engine lights and loss of engine function. Owners report the chain stretches enough to prevent remote start operation or jump timing entirely, leading to catastrophic engine damage including piston failure.
When: 50,000–105,000 miles; as early as 4,334 miles post-purchase; multiple owners report failure 3,000 miles after previous timing chain replacement
Symptoms owners cite: Check engine light; Abnormal ticking or rattling from engine; Reduced or no engine power; RPM spike followed by uncontrolled drop; Smoking or steaming engine; Inability to accelerate; Engine stalling
Codes mentioned: P0152, P0700
Repairs/costs cited: Timing chain replacement, typically $2,000–$3,700; one owner reported engine removed for repair; one owner quoted $7,000 for new engine after timing failure at 80,000 miles; costs rise if pistons or camshaft also damaged
Recalls/TSBs owners mention: Recalls issued for 2007 and 2009 GMC Acadia timing chain failures; no recall issued for 2008 model year despite identical complaints. TSB SB-11340 exists for timing chain issues but owners state it does not cover 2008 models. GM denies cost assistance citing non-GM dealer service history or warranty expiration.
Sudden loss of engine power and driveline lockup
Vehicle loses engine power suddenly during acceleration or highway driving, forcing driver to pull over. Transmission may lock into one gear (reported as 1st gear), or engine may refuse to accelerate past 15–25 mph. Warning lights illuminate simultaneously. Vehicle may stall and require restart; restart succeeds after brief delay or multiple key cycles.
When: Occurring on highways and intersections at various mileages (27,000–140,000+ miles); incidents cited at 72,255 miles, 74,000 miles, 95,000 miles, 100,600+ miles
Symptoms owners cite: Vehicle loses acceleration ability; Check engine light; Service stabilitrak light; Traction control light; Reduced power light; Engine light; Vehicle stalls mid-drive; Vehicle slows to minimal speed on its own; Transmission sticks in one gear; Vehicle requires restart to recover; Rough idle or running
Codes mentioned: P0700, P0752
Repairs/costs cited: Dealers cite transmission control module replacement (cost not always stated; one repair bill totaled $2,960 including timing chain and solenoid work), shift solenoid replacement, throttle body replacement or drying, sensor replacement. One dealer replaced transmission platelets and another charged $4,000 for complete transmission replacement at 96,000 miles. Many dealers cannot diagnose root cause and return vehicle unrepaired.
Recalls/TSBs owners mention: GM claims these are "command problems" (design-inherent issues) and denies warranty assistance. No recalls issued. Dealers are inconsistent in diagnosis; some blame transmission, others throttle body moisture, sensors, or timing chains after investigation.
Engine fire
Engine spontaneously catches fire while vehicle is parked or during highway driving. One fire started in engine compartment while parked in driveway and spread to adjacent vehicle. One fire occurred after owner accelerated on highway at speed and smoke emitted; vehicle caught fire immediately upon pullover. Both resulted in total loss.
When: One fire at approximately 19,000 miles (parked); one fire at approximately 200,000 miles (highway); one fire in driveway with no prior warning
Symptoms owners cite: Grayish-colored smoke from engine; Abnormal sound from engine; Flames visible in engine compartment; Vehicle engulfed in flames
Repairs/costs cited: Vehicles destroyed; repairs impossible. Fire department called in both documented cases.
Recalls/TSBs owners mention: No recall. One owner reported GM was not notified at time of fire. Insurance companies unable to determine cause.
Oil leaks from timing cover and engine seals
Engine leaks oil from multiple seals and gaskets, particularly the timing cover seal. Oil pooling visible under parked vehicle. Coolant also leaks from cooling system.
When: 73,000 miles (timing cover, water pump, and other seals); 105,000 miles (timing cover resealing); throughout vehicle ownership in some cases
Symptoms owners cite: Oil puddle under vehicle; Low oil level between services; Visible oil leaks from engine front; Low coolant level requiring frequent refilling
Repairs/costs cited: Multiple seal and gasket replacements (cost not itemized separately but owner reported major repair bill); water pump replacement $2,000+; timing cover resealing; power steering pump replacement mentioned in one case
Excessive oil consumption
Engine consumes abnormally high volumes of oil with no external leaks visible. Owner adds oil multiple times between changes.
When: 153,245 miles
Symptoms owners cite: Low oil level indicator; Abnormal ticking or noise from engine
Repairs/costs cited: Oil change performed but problem recurred; no repair completed
Recalls/TSBs owners mention: Manufacturer case filed but no resolution reported
Bent connecting rods and piston failure
Engine develops bent connecting rods in cylinders 3 and 4, or pistons fail and fall out of cylinders. Occurs after timing chain issues.
When: 43,000 miles (bent rods in cylinders 3 and 4); 3,000 miles after timing chain replacement (pistons fell out)
Symptoms owners cite: Check engine light; Vehicle will not run; Smoking or steaming engine; Oil and water spewing from engine
Repairs/costs cited: Engine replacement required; one estimate $7,000 for parts and labor; one engine deemed "shot"
Recalls/TSBs owners mention: GM initially denied cost assistance on bent rods at 43,000 miles, citing non-GM dealer purchase and service history. Dealership conflicting statements led owner to abandon repair attempt.
Camshaft sensor failure and camshaft issues
Camshaft sensor fails, camshaft misfits to engine block, or camshaft wears prematurely. Check engine light illuminates and remains on intermittently over months.
When: 994 miles (sensor bad) to 4,334 miles post-purchase; 142,293 miles (camshaft replacement needed)
Symptoms owners cite: Check engine light (multiple illuminations over months); Lack of acceleration power; Engine light illuminates on startup
Repairs/costs cited: Sensor replacement attempted; one owner diagnosed as needing camshaft replacement; another told entire engine replacement needed; costs not detailed
Recalls/TSBs owners mention: Tech support unable to resolve issue; dealers inconsistent in diagnosis
Exhaust fumes entering passenger compartment
Exhaust smell or fumes enter the cabin through vents when vehicle is stopped at lights or idling. Occurs repeatedly despite exhaust system and catalytic converter replacement. Causes nausea and headache in occupants.
When: Recurring throughout ownership starting early (January 2008 purchase); 7,000+ miles after exhaust work
Symptoms owners cite: Exhaust smell or fumes in cabin; Propane-like odor; Nausea and headache in passengers
Repairs/costs cited: Catalytic converter replaced; exhaust system switched out; foam cleaning of ventilation attempted—all unsuccessful
Recalls/TSBs owners mention: Dealer and GM corp contacted multiple times; doctor notes provided documenting illness but problem unresolved
Throttle body moisture and icing
Moisture accumulates inside throttle body and freezes in cold conditions, preventing engine from functioning. Drying the throttle body temporarily resolves issue, but problem recurs.
When: Recurring on multiple occasions years apart
Symptoms owners cite: Stabilitrak light; Traction control light; Reduced power light; Check engine light; Rough running; Engine loss of power on interstate
Repairs/costs cited: Throttle body dried by dealer; later replaced; problem recurred after fix
Recalls/TSBs owners mention: No permanent fix offered
Transmission solenoid and control module failure
Transmission solenoid block or transmission control module fails, causing transmission to slip, lock into single gear, or lose ability to shift. Vehicle loses power on highway and becomes unsafe.
When: 74,000 miles (transmission platelets and solenoid failure); 96,000 miles (complete transmission failure); other instances not specified
Symptoms owners cite: Transmission slipping; Transmission sticks in one gear; Vehicle unable to accelerate; Check engine light; Service stabilitrak light
Codes mentioned: P0752
Repairs/costs cited: Transmission control module and shift solenoid replacement ($2,960 total with other repairs); transmission replacement over $2,500–$4,000
Recalls/TSBs owners mention: GM denies warranty assistance after vehicle exits warranty, even for identical failures occurring within warranty period
Wave plate failure in transmission
Wave plate (transmission internal component) fails prematurely, sending metal debris into transmission and causing major damage. Vehicle may stall or lose power during driving.
When: 70,000 miles; 80,000+ miles in some reports
Symptoms owners cite: Transmission failure; Vehicle stalls or loses power; Grinding or noise from transmission
Repairs/costs cited: Major transmission repair or replacement required; at least one owner stated cost was approximately $2,500 but outside mileage warranty despite being within year warranty
Coolant leak into ventilation system
Coolant (Dexcool) leaks from cooling system and enters cabin ventilation, causing toxic fumes to be emitted into passenger compartment and affecting occupants' health.
When: After evaporative core replacement; 35,687 miles
Symptoms owners cite: Fumes entering cabin from ventilation; Passengers becoming ill; Coolant smell in cabin; Coolant leaking from engine area
Repairs/costs cited: Foam cleaner used to detail ventilation system; remedy failed
Chronic low coolant level
Coolant level drops repeatedly despite no visible major leaks. Owner refills coolant (Dexcool) multiple times. Eventually diagnosed as Class III leak from pressure relief valve or hose.
When: Recurring from 2014 onward across multiple years of ownership; steaming episode at 90+ mph on highway
Symptoms owners cite: Low coolant warning; Frequent need to refill coolant; Class III leak of Dexcool from front right wheel area; Steaming from engine area at highway speed
Repairs/costs cited: Pressure relief valve overfill claimed by one dealer; not definitively repaired
Recalls/TSBs owners mention: Multiple dealers unable to locate source of leak despite 20+ service visits
Engine will not stop after key removed
Engine continues to run after ignition key is removed and turned to off position. Engine eventually shuts off after a few seconds.
When: Not specified in complaint
Symptoms owners cite: Engine runs after key removed; Engine runs even in off position
Repairs/costs cited: No repair documented; problem occurred sporadically
Purge valve failure
Purge valve or purge solenoid fails or sticks open, triggering check engine light and requiring replacement.
When: Approximately 74,000 miles
Symptoms owners cite: Check engine light
Repairs/costs cited: Purge solenoid replacement (cost included in larger service bill of approximately $1,000)
Synthesized from 59 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 2 most recent
The car's air condition pump, filters, and hoses they had major contaminants. *tr
Had engine trouble with your 2008 GMC Acadia?
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 2008 GMC Acadia?
It's a meaningful issue. 59 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 50 complaints that reported odometer mileage, most engine failures cluster between 70,000 and 125,000 miles, with the median around 95,000. A quarter of owners report trouble before 70,000; a quarter make it past 125,000. 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/2008/GMC/Acadia.
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.