This service bulletin provides information on some vehicles that may rock or move slightly forward or rearward while in Park at start up after cold soak. This condition may be accompanied by a clunk noise. This is a slight movement that is more often seen visually, rather than felt, when viewed from the outside and using the auto-start feature, if equipped.
full bulletin at NHTSA ↗2008 Buick Enclave powertrain problems
moderate 119 complaints filed with NHTSA · avg repair $2,500 · see powertrain across all vehicles →
Failure mileage
Complaints
119
Recalls
0
Avg fix
$2,500
2crashes
1injury
When does it fail?
Of the 119 powertrain complaints filed for the 2008 Buick Enclave, 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
Of the 14 model years of Buick Enclave we track for powertrain problems, this one carries the most owner complaints on file — 119.
Owners have filed 119 powertrain 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.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering powertrain 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.
GM is receiving damaged (cracked or broken) transmission cores returned to the reman facilities. The damage is being caused either in the removal process by the technician, or inadequate packaging or shipping. This bulletin advises the dealers to be more careful not to damage the transmissions during removal and to package the core properly for return.
full bulletin at NHTSA ↗This bulletin provides information on the harmful effects of water or ethylene glycol in transmission fluid.
full bulletin at NHTSA ↗This service bulletin provides technicians with information to help identify the differences between what is considered a fluid leak, and what is considered fluid seepage.
full bulletin at NHTSA ↗This Warranty Admin service bulletin provides guidelines for Dealers Not Required and for Dealers Required to Contact the PQC for engine or transmission assembly replacement and explains the PQC process, GWM Transaction submission, vehicle service record retention and proper handling of assembly returns for Canadian Dealers only.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The 2008 Buick Enclave powertrain shows a clear primary failure mode: the transmission wave plate (also called snap ring or clutch wave plate) breaks or cracks, leading to sudden loss of acceleration, stuck gears, and complete transmission shutdown on highways and at intersections. Owners describe the issue as "known" to dealerships, and it occurs from 20,000 to 158,000 miles, often clustering in the 66,000–100,000 range. Repair costs range $2,000–$5,000; GM's Special Coverage program (issued March 2015) promises 10-year/120,000-mile coverage for wave plate defects, but many 2008 Enclave VINs report exclusion from this program, and owners already outside the window have been denied reimbursement.
A secondary but serious issue involves timing chain slippage, where the chain stretches and triggers check-engine and StabiliTrak lights; GM issued a 10-year/120,000-mile extended warranty for timing chain defects on 2007 and 2009 Enclaves but conspicuously excluded 2008 model-year vehicles, forcing owners to pay $2,500–$5,200 for repairs.
Additional powertrain complaints include transmission control module failures causing hard shifts and transmission shutdown, fuel tank defects, and intermittent engine stalling. Several owners report transmission hesitation, power loss during acceleration, and intermittent shifting issues that dealers cannot replicate or fix. Water leaks into the cabin and steering squeaks, while not powertrain-specific, add to the repair burden. Multiple owners note that warning lights often fail to illuminate before sudden power loss, creating a safety hazard on busy highways and interstates.
Same Buick Enclave powertrain reports on nearby years: 2009 · 2010 · 2011
Failure modes owners describe
Transmission wave plate failure
Broken, cracked, or failed clutch wave plate (3/5/R, 35R) in the 6T75 transmission causing internal damage, metal debris, and transmission loss of function. Owners report the wave plate as a 'known problem' acknowledged by dealerships. Failure results in inability to shift gears, stuck in first gear, stuck in neutral, loss of acceleration, and transmission shutdown on highways.
When: Typically 50,000–150,000 miles; owners report failures as early as 20,000 miles and as late as 158,000 miles. Many failures occur within or near the powertrain warranty expiration (5 years/100,000 miles).
Symptoms owners cite: Inability to shift gears or delayed/hard shifting; Stuck in first gear or neutral; Sudden loss of power and acceleration; Engine revs to high RPM (3500–4000+) without vehicle moving; Vehicle coasts to a stop on highway or in intersection; Check engine light illuminates; Humming or whirring noise from transmission; Hesitation between gears; Transmission slipping when accelerating; Rough shifting or jerking when putting in or out of gears
Codes mentioned: P0011, P0366, P0391, P0700, P0716, P0717, P0756
Repairs/costs cited: Wave plate rebuild or full transmission replacement. Owner-reported costs range from $2,000 (rebuild) to $5,000+ (new transmission). Dealership estimates: $2,577–$5,231. One owner paid $3,100 at dealership, another $2,800 for rebuild at independent shop, another $3,589.49. Metal debris often found inside transmission during repair.
Recalls/TSBs owners mention: GM acknowledged wave plate as a 'known problem' to dealerships but frequently denied warranty coverage when mileage exceeded 100,000 miles or when outside the 5-year window, even by as little as 3,000 miles. GM issued Special Coverage Adjustment #14404 (effective Mar 3, 2015) for 10-year/120,000-mile transmission clutch wave plate coverage, but some 2008 Enclave VINs reported as not covered by this program. Some owners received partial reimbursement (e.g., 30/70 split). GM declined to reimburse owners outside the coverage window or those who had already paid for repairs.
Timing chain slippage and failure
Timing chain stretches or slips, causing loss of engine synchronization and triggering check engine, StabiliTrak, and traction control warning lights. One owner reported timing chain failed after only 14,000 miles following initial replacement. Owners report GM issued a 10-year/120,000-mile extended warranty for timing chain issues on 2007 and 2009 Enclaves but skipped the 2008 model year.
When: Reported at 90,000–104,000 miles; one owner had replacement fail after 14,000 miles of use.
Symptoms owners cite: Check engine light illuminates; StabiliTrak warning light comes on and off intermittently; Traction control warning light; Engine shaking and stalling at red lights; Hesitation and lack of engine power
Codes mentioned: P0011, P0366, P0391
Repairs/costs cited: Timing chain and timing actuator replacement. Estimated repair cost range: $2,577–$5,231, depending on whether cylinder heads or camshafts also require replacement. One owner reported GM's extended warranty covered the repair; another's 2008 model was excluded from extended coverage available for 2007 and 2009 models.
Recalls/TSBs owners mention: GM issued a 10-year/120,000-mile extended warranty for timing chain slippage on 2007 and 2009 Enclave models but did not extend this coverage to 2008 model-year vehicles. One owner was denied coverage under powertrain warranty for timing chain replacement at 94,710 miles (under the 100,000-mile limit) because the extended warranty specifically excluded the 2008 Enclave.
Transmission shift cable or park engagement failure
Shift cable adjustment clip not fully engaged or transmission unable to properly hold park position. Vehicle rolls backward after being placed in park and key removed, or rolls forward unexpectedly. One owner's vehicle rolled backward on an incline and struck the owner's foot while unloading groceries.
When: Owner reported ongoing issue occurring once or twice per week.
Symptoms owners cite: Vehicle rolls backward after placed in park; Vehicle rolls forward unexpectedly; Transmission gear position does not match shifter position
Repairs/costs cited: No successful repair reported by either of two dealerships inspected. Both dealerships were unable to find a problem despite multiple visits.
Recalls/TSBs owners mention: Owner cited NHTSA recall campaign #09V073000 for 2009 Enclave (shift cable adjustment clip not fully engaged), suggesting the 2008 model may have similar defect but no corresponding recall issued.
Transmission control module and solenoid failures
Broken solenoid inside transmission or faulty transmission control module causing transmission malfunction, loss of power, stuck RPMs, and inability to shift. One owner's transmission module replacement did not resolve hard shift issues, and transmission failed one week later. Another experienced transmission stalling with stuck solenoid.
When: Reported at 90,000 miles and 30 MPH driving speeds.
Symptoms owners cite: Engine power reduced warning light; Vehicle stalls without warning; Stuck at high RPM (engine revs without acceleration); Hard shifts and rough shifting; Transmission fails to operate in reverse; Check engine light; Smoke and burnt metal smell
Codes mentioned: P0700
Repairs/costs cited: Transmission module replacement did not permanently resolve issues in at least one case; full transmission replacement required after module repair. Cost estimated at $3,000–$4,400 for full replacement.
Recalls/TSBs owners mention: GM recommended electronic code reset in one case but transmission failed again one hour later. No permanent fix identified.
Fuel tank defect (check engine light)
Fuel tank failure causing check engine light and potential fuel system shutdown. One owner reported a brand-new fuel tank required at 64,000 miles on a 6-year-old vehicle.
When: At 64,000 miles.
Symptoms owners cite: Check engine light remains on continuously; Risk of car stopping due to lack of fuel delivery
Repairs/costs cited: Fuel tank replacement cost: $505.
Recalls/TSBs owners mention: GM transferred responsibility to dealership; dealership conducted test outside service area and determined owner was responsible for cost.
Transmission hesitation and power loss
Transmission exhibits hesitation during acceleration, momentary loss of power between pedal and engine, and rough shifting. One owner reported fuel efficiency dropped from 17 MPG to 14–15 MPG concurrent with transmission hesitation; another reported inability to accelerate slowly without aggressive throttle input and difficulty maintaining normal acceleration.
When: Reported on trips and during normal highway and city driving.
Symptoms owners cite: Hesitation in acceleration at low speeds; Momentary lapse in power when pressing accelerator; Hesitation between gears (continuous or intermittent); Transmission slipping at highway speeds when accelerating; Inability to accelerate smoothly at low throttle input; Decreased fuel efficiency
Repairs/costs cited: No repairs completed for hesitation issues in reported cases; owners state transmission may eventually require full replacement.
Recalls/TSBs owners mention: Multiple dealership visits reported; dealers unable to replicate issue on test drives or find diagnostic codes, so nothing was done.
Engine noise (whistling/screeching)
Loud, continuous sharp whistling or screeching noise from engine audible while driving and idling. Occurs within 2 years, 4 months and under 25,000 miles. Dealership claimed all Enclaves make the same noise but owner refutes this.
When: Within 2 years, 4 months of ownership and under 25,000 miles.
Symptoms owners cite: Loud sharp whistling noise from engine; Screeching continues while idling; Noise is embarrassing and unacceptable for luxury vehicle
Repairs/costs cited: Dealership installed new defibrillator; issue not resolved. No successful repair reported.
Recalls/TSBs owners mention: GM claimed all Enclaves make the same noise (per dealership technician), contradicting owner's observation that other Enclaves on lot do not produce the noise.
Engine stalling while driving
Engine intermittently and unexpectedly shuts off without warning during normal driving at any speed (30–70 MPH). May or may not restart; no warning lights illuminate before failure. Issue is intermittent and difficult to diagnose.
When: Intermittently at any speed.
Symptoms owners cite: Sudden engine shutdown while driving; No warning lights prior to shutdown; Engine sometimes restarts, sometimes does not
Repairs/costs cited: Multiple dealership visits at $100 per visit; no problem identified or resolved. Issue recurs within one week of service visit.
Recalls/TSBs owners mention: None effective. Dealerships unable to diagnose or fix.
Water leak into cabin
Rainwater leaks into passenger compartment, pooling in headliner and pouring onto dashboard during hard braking or heavy rain. Issue has recurred multiple times despite three prior repairs in 2008. Represents electrical hazard and driver visibility/distraction safety issue.
When: Ongoing issue reported to recur after prior repairs.
Symptoms owners cite: Rainwater pouring from passenger-side headliner onto dashboard during braking or rain; Water pooling in vehicle interior
Repairs/costs cited: Prior repairs completed three times in 2008; issue recurred. No successful permanent repair reported.
Recalls/TSBs owners mention: GM offered only one free hour of diagnostic time per owner.
Steering squeak
Loud squeaking noise from steering system that persists across multiple dealership visits and does not improve or change in severity over time.
When: Present when vehicle was purchased; ongoing.
Symptoms owners cite: Loud steering squeak
Repairs/costs cited: Multiple dealership visits; no repair completed; dealership stated nothing was wrong.
Recalls/TSBs owners mention: Dealership advised no issue found on multiple visits despite owner reporting worsening squeak.
StabiliTrak and traction control false warnings
StabiliTrak and traction control warning lights illuminate and turn on/off intermittently, even when systems are functioning properly or when no defect is present. In one case, timing chain stretch triggered warning lights.
When: Reported on ongoing basis and at high mileage (148,000 miles in one case).
Symptoms owners cite: StabiliTrak warning light comes on and goes off repeatedly; Traction control warning light illuminates; Warning persists even with no underlying traction control defect; Traction control becomes disabled when warning triggered (in winter/snow conditions)
Repairs/costs cited: No successful repair reported in one case; in another, timing chain replacement was recommended but not yet completed.
Recalls/TSBs owners mention: GM did not provide clear diagnostic explanations in reported cases.
Synthesized from 119 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 6 most recent
The engine light came on... (4) recalls for other malfunctions..., the current re-call - 10/2014 on side air bags, that was taken care of. The engine light continued to stay on ...the dealership found the problem... The gas tank...a brand new gas tank was needed. How can that be, the car is ( 6 ) years - six . The mileage ( 64,000 ).. Record shows consistent car services, good care from the…
The contact owns a 2008 Buick Enclave. The contact stated while driving 45 MPH, the traction control warning light illuminated. The contact took the vehicle to an independent mechanic and was informed that the transmission needed to be replaced. The vehicle was not diagnosed or repaired. A dealer was not contacted. The manufacturer had not been informed of the failure. The failure mileage was…
Driving on the highway RPM's were going up but car was hardly moving. We could have been hit! After checking on-line this seems to be a problem for the 2008 enclave. Why has there not been a recall? I believe no-one wants to take responsibility for such a costly problem but someone is going to get hurt.....we were on the highway. I will not stop here....I am hoping someone will actually read and…
Tl* the contact owns a 2008 Buick enclave. The contact was driving approximately 40 MPH when the service engine warning light illuminated. In addition, the vehicle would not respond to acceleration attempts and then stalled. The vehicle was taken to the dealer and diagnosed as the transmission needing to be replaced. No repairs were performed. The manufacturer was notified but no solution was…
The car started to have trouble shifting into gears, especially overdrive. Then it wouldn't go into reverse. The 3-5 reverse waved plate broken, replaced 3-5 reverse housing, replace 3-5r piston and dam assembly, replace all seals and gaskets, replace front cover piston spring assembly, and transmission fluid filter.......$3,173 later I was out the door not happy. I was out of town on vacation…
While on the highway on a trip, the transmission of my 2008 Buick enclave started skipping/shifting roughly when accelerating/upshifting. Soon the transmission would not go faster than 30 miles an hour and seemed stuck in 2nd gear. I exited the highway as soon as I was able to. By then, it could not go on reverse either. At the repair shop, the transmission was disassembled, with a broken wave…
Had powertrain trouble with your 2008 Buick Enclave?
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 powertrain problem on the 2008 Buick Enclave?
It's a documented issue but not catastrophic. 119 complaints have been filed. Repairs average $2,500 and most owners catch it before it causes a breakdown.
At what mileage does the powertrain typically fail?
Across the 106 complaints that reported odometer mileage, most powertrain failures cluster between 73,000 and 114,000 miles, with the median around 88,500. A quarter of owners report trouble before 73,000; a quarter make it past 114,000. 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 $2,500 for powertrain 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 powertrain?
No active recalls currently cover powertrain 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/Buick/Enclave.
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.