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 ↗2007 Chevrolet Avalanche powertrain problems
severe 20 complaints filed with NHTSA · avg repair $2,500 · see powertrain across all vehicles →
Failure mileage
Complaints
20
Recalls
0
Avg fix
$2,500
1crash
1fire
When does it fail?
Of the 20 powertrain complaints filed for the 2007 Chevrolet Avalanche, 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
Among the 7 model years of Chevrolet Avalanche in our records for powertrain problems, this one ranks #2 by owner-complaint volume.
No new NHTSA powertrain complaint has been filed on this vehicle in over 7 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 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 2007 Avalanche's powertrain exhibits a pattern of serious defects that emerge across this cluster. Transmission failure is the dominant complaint: owners describe loss of drive gear, inability to engage higher gears, loud clunking or grinding on shifts, and slipping—often occurring between 27,000 and 93,000 miles. Many report the failures happen right after warranty expiration. A few owners cite sprag or sun gear internal breakage; repair costs run $2,800 to $3,000-plus.
Engine power loss is the second major issue. Drivers report total power cutoff at highway speeds, triggering "Reduce Power Mode" and check engine lights. Throttle Position Sensor (TPS) failure is the confirmed cause in several cases. One owner noted GM's service bulletins cover TPS replacement for 2008–2011 Avalanches but denied coverage on the 2007 despite identical part numbers.
Stability and traction control systems malfunction, with service warnings activating repeatedly and the vehicle unexpectedly shifting from 2WD to 4WD high while the selector is in 2WD. One owner's vehicle also experienced rear axle seal failure and fire at 12,832 miles. Multiple owners report electrical gremlins—burning wire smells, cruise control and radio dropout, air bag light cycling on and off. The wiper/washer module failure tied to recall #0848 suggests a broader wiring harness vulnerability.
Same Chevrolet Avalanche powertrain reports on nearby years: 2005 · 2006
Failure modes owners describe
Transmission failure—loss of drive and gear engagement
Complete transmission failure where drive gear becomes inoperable or severely limited. Owners report the truck will not move in drive or loses drive entirely; some gears (typically 1st, 2nd, 3rd) work intermittently or with severe slipping. Often occurs on acceleration or gear shift, sometimes accompanied by clunking or grinding sounds. Failures reported at 27,000 to 93,000 miles.
When: 27,000 to 93,000 miles; often shortly after warranty expiration
Symptoms owners cite: No power in drive gear, only 1st or 2nd moves vehicle; Loud clunking or grinding noise during acceleration or gear shift; Transmission slipping out of gear; Jerking or harsh shifts; Vehicle stalls or loses power on acceleration; Sprag gear or sun gear breakage (internal component failure)
Codes mentioned: Transmission fault codes (not explicitly cited in narratives)
Repairs/costs cited: Complete transmission rebuild or replacement; owners report repair costs exceeding $2,800–$3,000+. Some dealers cite forward sprag gear damage requiring replacement.
Throttle Position Sensor (TPS) / engine power loss in reduce-power mode
Engine loses total power while driving, triggering 'Reduce Power Mode' message and check engine light. Vehicle either shuts off or becomes undrivable on the highway. Condition is intermittent and repeats after diagnostic reset. Throttle Position Sensor (TPS) confirmed as root cause by dealers; some owners report related codes for stability control/ABS.
When: Reported on highway driving; one case at 195,000 miles
Symptoms owners cite: Total loss of engine power while driving at highway speeds; 'Reduce Power Mode' illuminated on display; Check engine light illuminates; Engine stalls or shuts off; Stability control and ABS warning lights illuminate; Intermittent recurrence even after code reset
Codes mentioned: Throttle Position Sensor (TPS) code, Stability/ABS codes
Repairs/costs cited: TPS replacement; front wheel speed sensor also replaced in one case.
Recalls/TSBs owners mention: GM Service Bulletin #11273B addresses TPS issue for 2008–2011 vehicles. Bulletin PIP3089B addresses bad wiring to TPS for 2003–2006 Avalanches. GM denied coverage on 2007 model despite identical part numbers.
Stability/traction control system malfunction—unintended 4WD engagement
Service Stabilitrak and Service Traction Control warnings activate repeatedly. Vehicle switches from 2-wheel drive to 4-wheel drive high even when the selector is in 2WD position. Occurs while driving, parked, and with cab empty. First occurrence at 70K miles, recurring at 90K, 97K, 101K, and 116K miles.
When: 70,000 to 116,000 miles; recurring over vehicle lifetime
Symptoms owners cite: Service Stabilitrak warning light illuminates; Service Traction Control warning light illuminates; Unintended automatic shift from 2WD to 4WD high; Shift occurs while parked, driving, or with vehicle unoccupied
Codes mentioned: Service Stabilitrak code, Service Traction Control code
Evaporative emission control system leak
Check engine light with evaporative emission control (EEC) code indicating a leak in the return line. Owners report the line was replaced at 70K miles and failed again by later mileage. Dealer initially attributed leak to 'water in the connector,' which owners dispute as implausible.
When: First occurrence at 70K miles; recurrence at later mileage
Symptoms owners cite: Check engine light illumination; Evaporative emission control warning
Codes mentioned: EEC (Evaporative Emission Control) code
Repairs/costs cited: Return line replacement performed; recurring failure suggests defective component or design flaw.
Rear axle seal failure and fire
Defective pinion seal in the rear axle caused transmission fluid to leak and ignite while towing a trailer at highway speed. Fire department determined the failure involved synthetic rear axle fluid. The incident caused loss of braking power, white and black smoke, and vehicle fire that damaged fuel tank, trailer, tailgate, and quarter panel.
When: Early in vehicle ownership at 12,832 miles
Symptoms owners cite: White and black smoke from rear view mirror; Brake pedal extends to floor when applied; Fluid dripping from rear axle; Rear axle catches fire; Loss of braking power (except trailer electric brake)
Repairs/costs cited: $1,800 in fire damage reported; vehicle required towing.
Recalls/TSBs owners mention: Dealer identified defective pinion seal; however, fire department attributed failure to synthetic rear axle fluid.
Engine stall and hard start in reduced power mode
Vehicle stalls while driving at various speeds, often at stops or during light acceleration. Check engine and multiple warning lights illuminate (traction control, ABS, Stabilitrak). Disconnecting and reconnecting the battery temporarily restores operation. Transmission jerking and abnormal clicking sounds accompany the condition. Failure persists after spark plugs, brake light switch, and transmission oil filter replacement.
When: Occurred at 195,000 miles; reported as reoccurring
Symptoms owners cite: Vehicle stalls while driving; Check engine light illuminates; Traction control, ABS, and Stabilitrak warning lights; Abnormal clicking sounds from engine; Transmission slipping and jerking; Reduced Power mode message displayed
Codes mentioned: Multiple warning codes (check engine, ABS, Stabilitrak, traction control)
Repairs/costs cited: Spark plugs, brake light switch, and transmission oil filter replaced without resolving issue.
Wiper and washer fluid module malfunction (related to recall #0848)
After recall #0848 service (heated washer fluid module wire harness replacement), wipers activate and spray fluid when in off position. Issue is intermittent but repeats multiple times. Dealer diagnosis: washer module defective, requires replacement per GM Service Bulletin #4298.
When: First occurrence after October 2009 oil pressure sensor failure; reported Dec 2009
Symptoms owners cite: Windshield wipers activate while in off position; Washer fluid sprays with wiper activation; Intermittent activation requiring engine shutdown to stop
Repairs/costs cited: Washer module replacement (GM Part #1910885); service per GM Bulletin #4298 dated 02/26/07.
Recalls/TSBs owners mention: GM Service Bulletin #4298; recall #0848 for heated washer fluid module wire harness.
Oil pressure sensor failure and related cascade faults
Engine loses oil pressure, triggering check engine light and 'turn off engine' message. Oil pressure sensor replaced at dealership. Owner believes sensor failure is linked to recall #0848 repairs and subsequent wiper module malfunction, catalytic converter, and O2 sensor replacements. Suggests a systemic electrical or harness issue cascade.
When: October 2009, approximately 2–3 years after vehicle purchase (Recall #0848 performed Apr 2009)
Symptoms owners cite: Check engine light illuminates; 'Turn off engine' warning message; Loss of oil pressure (detected by sensor)
Codes mentioned: Oil pressure sensor fault code
Repairs/costs cited: Oil pressure sensor replacement at dealership.
Recalls/TSBs owners mention: Recall #0848 (heated washer fluid module wire harness); owner alleges subsequent failures are related.
Transmission bump on acceleration and vehicle creep in park
Transmission produces a bump or jerk when accelerating from a stop. Vehicle creeps or moves forward slightly when in park and engine is cranked. Intermittent occurrence.
When: Several months prior to complaint; recurring issue
Symptoms owners cite: Bumping sensation during acceleration from stop; Vehicle creeps forward in park when engine is cranked
Electrical issues—cruise control, radio, heating/AC fan, and burning wire odor
Random electrical faults affecting cruise control, radio, and heating/AC fan operation. Intermittent burning wire smell suggests arcing or short circuit in electrical harness. Combined with air bag light and transmission issues.
When: Intermittent throughout vehicle ownership
Symptoms owners cite: Cruise control malfunction; Radio dropout or malfunction; Heating and AC fan intermittent operation; Burning wire odor (intermittent)
Codes mentioned: Air bag warning light (triggered by inflator or sensor issue)
Synthesized from 20 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 2 most recent
We were driving down i20 when we were coming off the off ramp and the stabilization light came on and we got to the stop sign to turn right and as were take off it shifted really bad out into 2nd it jerked really bad and we had no power we made it home and now it turns over but will not start. 2007 avalance it has 50,000 miles. I have been talking to other people on car gurus and there are…
Transmission failure, no warning signs. Vehicle felt like it popped out of gear. Truck does nothing in drive, only moves in reverse, 1st, and still does major slipping. Online research has informed me that this is a common issue among this type of truck. *tr
Had powertrain trouble with your 2007 Chevrolet Avalanche?
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 2007 Chevrolet Avalanche?
It's a meaningful issue. 20 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 19 complaints that reported odometer mileage, most powertrain failures cluster between 36,000 and 98,000 miles, with the median around 64,400. A quarter of owners report trouble before 36,000; a quarter make it past 98,000. 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/2007/Chevrolet/Avalanche.
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.