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 ↗2009 Chevrolet Tahoe powertrain problems
severe 14 complaints filed with NHTSA · avg repair $2,500 · see powertrain across all vehicles →
Failure mileage
Complaints
14
Recalls
0
Avg fix
$2,500
1crash
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 2009 Tahoe powertrain complaints cluster around two main problem areas: hybrid system lurching and broader transmission/electrical failures affecting both hybrid and standard models.
Hybrid owners consistently report sudden forward lunges when the system switches between electric and gasoline engine operation—most dangerous in stop-and-go traffic. The lurch feels like rapidly releasing a manual clutch and forces emergency braking. Some owners replaced the auxiliary transmission fluid pump without lasting relief. One hybrid owner's independent research points to pump or control module failures engaging gears improperly during mode switching; another found the transmission was missing a main bearing at manufacture, though the dealer rebuilt it rather than replacing it.
Across the full lineup, transmissions shift hard and constantly, fail to hold cruise control speed, and resist acceleration—sometimes accompanied by check engine lights, stalling, and electrical chaos. One owner reported 47 diagnostic codes and no transmission-computer communication even after ECM replacement costing thousands. Dealers consistently fail diagnosis. Independent repairs replacing auxiliary transmission pumps and control modules show mixed results. One owner's transmission nearly threw a service technician through the windshield on a cold start. Electrical gremlins cause door locks to cycle unpredictably, power steering to drop out, and the vehicle to accelerate unintended to 55 mph with stability control disabled. Repair attempts have been unsuccessful or incomplete.
Same Chevrolet Tahoe powertrain reports on nearby years: 2007 · 2008
Failure modes owners describe
Hybrid System Lurch / Uncontrolled Acceleration on Mode Switching
In hybrid models, when the system switches between electric and gasoline engine operation, the vehicle lurches forward suddenly—described as similar to quickly releasing a clutch on a manual transmission. Owners report this occurs commonly in stop-and-go traffic and poses a collision risk. The issue appears linked to failure of the auxiliary transmission fluid pump (electric-motor-driven in electric mode) or associated control modules that may engage gears inappropriately during mode transitions.
When: Stop-and-go traffic, upon hybrid system switching; at least weekly for some owners; occurs from early mileage (around 9000 miles) through higher mileage
Symptoms owners cite: Sudden forward lurch when switching between gas and electric modes; Uncontrolled acceleration requiring emergency braking; Feeling similar to dumping a manual transmission clutch; Occurs in stop-and-go traffic situations
Repairs/costs cited: Some owners report replacing the auxiliary transmission fluid pump resolves the issue; others still experience lurching after pump replacement. Some owners claim no repair was completed or available.
Transmission Manufacturing Defect (Missing Bearing)
One owner reported that upon dealer investigation, the transmission was found to have been manufactured missing one of the main bearings. The vehicle initially ran fine for approximately 9000 miles before symptoms appeared. The transmission was rebuilt (not replaced) after dealer and GM approval; the repair took about three weeks.
When: Approximately 9000 miles; first start or after 5 hours of sitting
Symptoms owners cite: Vehicle jumps forward then locks up; Engine stalls after acceleration attempt; Occurs consistently on cold/warm starts and after vehicle sits; Violent enough to nearly throw a service technician through the windshield
Repairs/costs cited: Transmission rebuild to replace missing bearing; GM required all repairs be approved by the manufacturer rather than installing a new transmission
Recalls/TSBs owners mention: GM was notified and approved all rebuild repairs
Intermittent Acceleration Resistance with Electrical Anomalies
Vehicle intermittently resists acceleration accompanied by warning chimes and erratic door locking/unlocking. The failure occurs regardless of speed and involves warning light flashing, sudden deceleration as if in neutral, and unresponsive accelerator. Dealer unable to diagnose.
When: 57,000 miles; multiple occasions
Symptoms owners cite: Intermittent resistance to acceleration; Warning chime sounding; Unexpected door locking and unlocking; Warning lights flashing; Rapid deceleration as if in neutral; Unresponsive accelerator
Repairs/costs cited: Not repaired; dealer unable to diagnose
Recalls/TSBs owners mention: Manufacturer made aware, offered no assistance
Stalling with Check Engine Light and Abnormal Acceleration
Vehicle stalls with illumination of check engine light, followed by abnormal acceleration. Dealer initially diagnosed dirty fuel injector and performed cleaning, which failed. Converter replacement also unsuccessful. Independent shop diagnosed defective torque converter and transmission requiring replacement.
When: 35,000 miles
Symptoms owners cite: Vehicle stalling; Check engine warning light illumination; Abnormal acceleration; Continued issues after multiple repair attempts
Repairs/costs cited: Fuel injector cleaned by dealer (failed); torque converter replaced by dealer (failed); independent shop diagnosed defective torque converter and transmission requiring replacement
Jerking, Independent Acceleration, and Stalling at Higher Mileage
Vehicle jerks, accelerates independently, and stalls at various speeds on different occasions. Service engine warning light illuminated. Independent mechanic replaced auxiliary transmission fluid pump and auxiliary transmission control module, though repair completion status unclear.
When: Approximately 145,000 miles
Symptoms owners cite: Jerking while driving; Independent/unintended acceleration; Vehicle stalling; Service engine warning light illuminated
Repairs/costs cited: Auxiliary transmission fluid pump and auxiliary transmission control module replaced by independent mechanic; repair status unclear
Hybrid Surge on Deceleration / Disengagement
In hybrid mode, when braking and the hybrid system disengages, the vehicle surges forward suddenly, preventing normal stopping. This creates collision hazard with vehicles ahead or pedestrians. Dealer unable to identify cause after two visits.
When: During braking and hybrid system disengagement
Symptoms owners cite: Vehicle surges forward when hybrid system disengages during braking; Prevents stopping normally; Collision hazard with vehicles or pedestrians in crosswalks
Repairs/costs cited: Not repaired; dealer unable to find cause after two visits
Transmission Hard Shifting and Speed Control Failure
Six-speed transmission shifts constantly and harshly. Vehicle fails to maintain set speed when cruise control is engaged. Dealer replaced multiple transmission modules and sensors without resolving the issue.
When: <UNKNOWN>
Symptoms owners cite: Constant, hard transmission shifting; Cruise control unable to maintain speed
Repairs/costs cited: Dealer replaced several transmission modules and sensors
Transmission Shifting Issues During Towing
Transmission has difficulty shifting when vehicle is towing. Owner also reports brake wear requiring two replacements and driver-side hub replacement.
When: During towing operations
Symptoms owners cite: Transmission trouble shifting during towing
Repairs/costs cited: Not specified; also required two brake replacements and driver-side hub replacement
Reduced Engine Power / Electrical Control Failure
Vehicle experiences reduced engine power, loss of power steering, transmission-computer communication failure, and multiple electrical malfunctions. Vehicle may rev and accelerate to 55 mph on its own, stability control turns off, door locks and auto shut-off malfunction. Dealer identified 47 diagnostic codes and inability to communicate between transmission and computer. ECM replacement attempted but issue persisted.
When: <UNKNOWN>
Symptoms owners cite: Reduced engine power; Loss of power steering; Unintended acceleration to 55 mph; No communication between transmission and computer; Stability control disabled; Door locks and auto shut-off malfunction; Multiple electrical anomalies
Codes mentioned: P2138, 47 codes total (per one report)
Repairs/costs cited: ECM replaced costing thousands; issue persists
Drivetrain Vibration from Delivery
Vehicle exhibited drivetrain vibration since initial dealer delivery. Unintended acceleration occurred early in vehicle ownership at low mileage. Airbag warning notice issued against front passenger seat occupancy.
When: Since delivery (November/December 2015); unintended acceleration at 8680 miles
Symptoms owners cite: Drivetrain vibration; Unintended acceleration; Airbag warning notice issued
Engine Warning Lights and Stalling with Forward Surge
Vehicle displays warning lights instructing driver to turn off engine. Vehicle tugs forward and has stalled on multiple occasions. Engine warning light remains continuously illuminated.
When: <UNKNOWN>
Symptoms owners cite: Warning light directing to turn off engine; Vehicle surges forward; Multiple stalling incidents; Persistent engine warning light
Synthesized from 14 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 0 most recent
Had powertrain trouble with your 2009 Chevrolet Tahoe?
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 2009 Chevrolet Tahoe?
It's a meaningful issue. 14 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $2,500.
At what mileage does the powertrain typically fail?
Across the 12 complaints that reported odometer mileage, most powertrain failures cluster between 35,000 and 100,000 miles, with the median around 76,000. A quarter of owners report trouble before 35,000; a quarter make it past 100,000. 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/2009/Chevrolet/Tahoe.
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.