Engine light came on, "reduced traction control" light came on, power was drastically reduced and then "reduced engine power" light came on. Car has a problem that needs to be addressed, but cutting off power and acceleration while I'm making a turn with oncoming traffic or driving 70+ MPH is not a safe way of addressing that problem. I can turn off the car and regain power. Nearly any other…
2006 Chevrolet Impala powertrain problems
severe 93 complaints filed with NHTSA · avg repair $2,500 · see powertrain across all vehicles →
Failure mileage
Complaints
93
Recalls
0
Avg fix
$2,500
5crashes
2fires
3injuries
When does it fail?
Of the 93 powertrain complaints filed for the 2006 Chevrolet Impala, 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
Of the 15 model years of Chevrolet Impala we track for powertrain problems, this one carries the most owner complaints on file — 93.
Owners have filed 93 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.
The failure pattern owners describe
Owners report two dominant powertrain failure patterns on the 2006 Impala. The first is transmission slipping and delayed engagement: engine revs but the car doesn't move for 2–4 seconds, then slams into gear. It starts around 60,000 miles, progressively worsens, and often produces no check-engine light. Dealer transmission flushes provide a week of relief; valve-body swaps last three days. When transmission replacement becomes necessary—cost $2,400–$6,000 out-of-pocket after warranty—rebuilt units exhibit identical symptoms within 25,000 miles. One owner experienced three separate transmission failures across 75,000 miles.
The second critical issue is a throttle-body electrical fault that triggers "Reduced Engine Power" at highway speed without warning, dropping the vehicle from 60–70 mph to 15–30 mph and making the throttle unresponsive. One dealer reported performing three to four of these repairs weekly. A police officer's vehicle unexpectedly shifted into Reverse while parked, dragging him under the car and resulting in injury.
Owners also report isolated but severe electrical faults—dead batteries that won't crank despite good starter and alternator, in one case ending in alternator fire. These defects appear pattern-based rather than isolated: owners cite hundreds of online forum posts describing identical failures across model-years 2006–2009.
Same Chevrolet Impala powertrain reports on nearby years: 2005 · 2007 · 2008 · 2009
Failure modes owners describe
Torque Converter Clutch Failure
Torque converter clutch material breaks down and circulates in transmission fluid, causing rapid locking/unlocking cycles at cruise speed and harsh engagement from stops. Remanufactured units show same problem shortly after installation.
When: 59,000–86,000 miles; recurring on replacement units
Symptoms owners cite: Rapid torque converter clutch locking and unlocking at cruising speeds; Slipping and revving from a stop without car moving, then sudden slam into gear; 4–3 downshift oscillation at ~60 mph; Excessive transmission heat buildup with converter unlocked (40°F above normal); Torque converter material found in transmission pan
Repairs/costs cited: First failure: transmission rebuild with new soft parts and converter replacement at 59K miles (warranty). Second failure: transmission replaced with GM remanufactured unit at 86K miles (warranty). Third: partial rebuild at independent shop post-warranty; dealer claimed oscillation and heat were 'normal.'
Recalls/TSBs owners mention: Warranty coverage for first two failures; dealer denial of defect on replacement unit
Transmission Slipping and Delayed Engagement
Transmission slips under load or hesitates to engage after shifting from Park to Drive or from a complete stop. Starts mildly and progressively worsens. Occurs with no check-engine light or diagnostic codes present in many cases.
When: 60,000–130,000 miles; often begins ~60K miles and worsens over 10,000–20,000 mile intervals
Symptoms owners cite: Engine revs but car does not move initially, then slips hard into gear (2–4 second delay); Slipping from Park to Drive or at traffic lights when accelerating from stop; Transmission shudders, stutters, or shakes on acceleration; Slippage in 1st–2nd gear transition and in 4th gear/overdrive; Jerking or 'clunk' when shifting from Reverse to Drive at driveway exit; No check engine light or transmission warning codes; Dealer unable to replicate issue during diagnostic visit
Repairs/costs cited: Transmission flushes (temporary relief lasting ~1 week). Valve body replacement (temporary relief lasting ~3 days). Full transmission rebuild or replacement ($2,400–$3,000 out-of-pocket when warranty expired). Rebuilt/remanufactured units show same symptoms within 25,000–30,000 miles.
Recalls/TSBs owners mention: Dealers claim 'normal behavior'; no action without transmission code. One owner reported TSB #070730012C and NHTSA Campaign #10021844 addressed issue but no recall issued. GM master tech recommended valve body change.
Transmission Fails to Shift or Stays Out of Gear
Transmission either does not shift from Park or slips completely out of gear while driving, causing loss of propulsion or unintended rolling. One police officer's vehicle shifted into Reverse while parked and unoccupied, resulting in serious injury.
When: Variable; from 1,000 miles to 101,000 miles
Symptoms owners cite: Vehicle rolls backward after parking on incline or after officer exits car; Transmission slips out of gear while driving; Transmission will not shift from Park to Drive without multiple attempts; Vehicle goes into gear unexpectedly and backs up when unoccupied; Intermittent neutral condition—car acts like it's in neutral, revs up, then suddenly bangs into gear
Repairs/costs cited: Police fleet car towed; GM representatives found 'nothing wrong' per fleet management. Other vehicles involved in accidents; officers charged despite vehicle defect. No repair documented in most cases.
Recalls/TSBs owners mention: GM inspectors claimed 'no defect found' despite multiple officer complaints and documented injuries
Reduced Engine Power / Throttle Body Failure
Engine power cuts to ~30 mph without warning while driving at highway speeds, accompanied by 'Reduced Engine Power' or 'Service Traction Control' messages. Vehicle becomes unresponsive to throttle input and hazard escalates in traffic.
When: Variable; some cases noted at 80,000 miles
Symptoms owners cite: Sudden 'Reduced Engine Power' message; speed drops from 60–70 mph to 15–30 mph; Throttle pedal pressed fully but engine will not accelerate; 'Service Traction Control' light illuminates; Vehicle unresponsive to input; requires restart to regain power; Multiple occurrences over time; one owner experienced issue twice within one year
Codes mentioned: Throttle Position Sensor (TPS) fault, Throttle body codes
Repairs/costs cited: Throttle body replacement. One dealer reportedly performs 3–4 of these repairs per week. Oil corrosion of throttle wiring cited as cause; may correlate with excessive oil consumption.
Recalls/TSBs owners mention: No recall issued despite documented pattern. Online forums show hundreds of owners with identical issue.
No-Start / Electrical Power Loss
Vehicle loses all electrical power or fails to crank despite battery and starter being functional. Power may return after hours of waiting, but vehicle still will not start or crank. Intermittent and difficult to diagnose.
When: Variable; recurring issue from vehicle's early life
Symptoms owners cite: No power to entire vehicle; all lights dead despite good battery; Battery cable requires manual repositioning to restore power; Vehicle starts and runs intermittently; stalls unexpectedly; Requires repeated jump-starts; does not hold charge; Check engine light and battery system warning lights illuminate intermittently; Alternator overheating and fire in one case
Codes mentioned: B1000-00 (Electronic Control Unit fault)
Repairs/costs cited: Battery replacement; starter replacement; alternator replacement (in one case, alternator caught fire and had to be cut away by fire department). Root cause remains undiagnosed in most cases; described as 'electrical defect' by independent mechanics.
Recalls/TSBs owners mention: No specific warranty action documented; dealers unable to isolate cause
4T65E-HD Transmission Torque Rating Mismatch (LS4 Engine Pairing)
LS4 V8 engine (323 lb-ft torque) paired with 4T65E-HD transmission rated for only 280 lb-ft, creating 43 lb-ft torque overload. This undersized transmission combination contributes to high failure rates in 2006–2009 Impala SS and related W-body vehicles.
When: Design issue affecting all LS4 + 4T65E-HD equipped vehicles from factory
Symptoms owners cite: Premature transmission failure (multiple failures reported in same vehicle); Torque converter and clutch material degradation; Excessive heat buildup despite normal driving
Repairs/costs cited: Owner documented GM spec sheets showing transmission rated for 280 lb-ft vs. engine output of 323 lb-ft. No corrective action by manufacturer.
Recalls/TSBs owners mention: No recall; no design change. One owner noted 100+ other V8 W-body owners experiencing identical failures.
Transmission Overheating
Transmission runs excessively hot under normal and light driving conditions, remaining warm long after engine cools. Correlates with transmission fluid breakdown and premature failure.
When: Throughout vehicle's life; worsens with age
Symptoms owners cite: Transmission stays warm to touch during post-repair inspection when engine and exhaust are cool; Fluid discoloration and breakdown despite regular fluid changes; Higher-than-normal transmission temperature readings (40°F above baseline in one case)
Repairs/costs cited: Fluid flushes provide temporary relief. Cooling system inadequacy not addressed.
Recalls/TSBs owners mention: No TSB or design correction identified
Hard Shifting and Jerking Engagement
Transmission engages abruptly with violent jerking or 'clunking' when shifting from Reverse to Drive, at traffic lights, or during normal gear transitions. Creates whiplash-type motion and unintended acceleration or deceleration.
When: Can begin as early as 1,000 miles; progressive worsening
Symptoms owners cite: Hard 'clunk' or jerk when backing out of driveway and pulling into Drive; Violent jerking when vehicle lunges forward 10–15 feet unexpectedly at stops or low speed; Transmission hesitation followed by sudden engagement; Shuddering torque converter lockup; Erratic RPM bouncing at steady highway speed
Repairs/costs cited: Valve body and solenoid replacement in at least one case (GMPP warranty coverage). Issue recurs in rebuilt/remanufactured transmissions.
Recalls/TSBs owners mention: Dealers claim behavior is 'normal' for transmission type. NHTSA Campaign #10021844 and TSB #070730012C referenced by owner but no recall issued.
Synthesized from 93 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 1 most recent
Had powertrain trouble with your 2006 Chevrolet Impala?
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 2006 Chevrolet Impala?
It's a meaningful issue. 93 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 81 complaints that reported odometer mileage, most powertrain failures cluster between 60,000 and 127,000 miles, with the median around 83,000. A quarter of owners report trouble before 60,000; a quarter make it past 127,000. 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/2006/Chevrolet/Impala.
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.