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 ↗2005 Chevrolet Impala powertrain problems
severe 33 complaints filed with NHTSA · avg repair $2,500 · see powertrain across all vehicles →
Failure mileage
Complaints
33
Recalls
0
Avg fix
$2,500
4crashes
3injuries
When does it fail?
Of the 33 powertrain complaints filed for the 2005 Chevrolet Impala, here's the actual mileage breakdown — failures cluster heaviest at 150,000+ 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 33 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.
This bulletin provides information on the harmful effects of water or ethylene glycol in transmission fluid.
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 ↗This PI bulletin advises the technician on the proper way to install the pistons in an engine.
full bulletin at NHTSA ↗This service bulletin provides a vibration analysis worksheet the technician can use in conjunction with the appropriate Vibration Analysis-Road testing procedure when diagnosing vibration concerns.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Owners report transmission problems falling into three broad patterns. The most common complaint is hard or jerky shifting from a standstill, especially between first and second gear. This can happen within the first two years of ownership and gets worse over time. Owners describe a grinding or slipping sound followed by a loud pop as the car lurches into gear. One owner was told this is inherent to the design for fuel economy.
A second category involves transmission slipping out of gear or refusing to shift. Owners report the transmission dropping into neutral mid-drive, not shifting into gear at all, or the shift lever jamming in Park. At least one owner faced this at 196,000 miles.
The third major pattern involves the transmission rolling the vehicle backward while in Drive or forward in Reverse, even on slight inclines. Multiple owners report dealers claiming this is normal for the model. Some owners have experienced transmission fluid leaks, cracked flex plates (beginning around 49,000 miles), and recurrence of problems after transmission fluid service.
The 4L60-E/4T65-E transmissions appear affected. Owners cite P1811 diagnostic codes and mention pressure control solenoid issues as a recurring theme. Many dealers cannot duplicate problems during diagnostic testing. Repair costs mentioned range from $700 to replacement-level expenses; one owner received only $1,000 toward a full replacement.
Same Chevrolet Impala powertrain reports on nearby years: 2006 · 2007 · 2008
Failure modes owners describe
Hard or Jerky Shifting on Takeoff
Transmission shifts hard from standstill, particularly from first to second gear. Owners report grinding or slipping sounds followed by loud pop and violent jerking into gear. Problem worsens over time and is more pronounced after stop-and-go traffic or when engine is warm.
When: Starts within first 2 years; affects vehicles from 44,000 to 131,000+ miles
Symptoms owners cite: Grinding or slipping noise before shift; Violent jerking into gear; Hard shifting especially 1st to 2nd and 2nd to 3rd; Shuddering noise during shift; Intermittent occurrence, sometimes after parking 10 minutes
Codes mentioned: P1811
Repairs/costs cited: Transmission fluid and filter change provided only temporary relief (one week); cost cited $700 or more
Recalls/TSBs owners mention: Dealers unable to duplicate in many cases; one dealer stated hard shifting is design feature for fuel economy; dealership offered only $1,000 credit toward transmission replacement in at least one case
Transmission Slippage and Loss of Drive
Transmission slips, loses drive, or refuses to shift into gear while driving. Vehicle may suddenly downshift to neutral, drop out of drive entirely, or fail to shift into gear after being placed in Drive.
When: 59,000 to 196,000+ miles
Symptoms owners cite: Transmission slips during driving; Car drops into neutral mid-drive; Transmission will not shift into gear; Vehicle stalls several times during incident; Unexpected downshift with violent jerking
Repairs/costs cited: Transmission fluid and filter change did not resolve; vehicles not repaired in some cases
Recalls/TSBs owners mention: Transmission fluid service recommended by dealers; one recall campaign (14V400000) mentioned but owner not included
Transmission Shift Lever Stuck in Park
Shift lever becomes stuck and cannot be moved out of Park position. Can occur suddenly with no prior warning.
When: Can occur at any mileage with no warning
Symptoms owners cite: Shift lever immobilized in Park; Sudden onset with no prior indication; Lever will not move to other positions
Backward Rolling in Drive and Forward Rolling in Reverse
Vehicle rolls backward while in Drive or forward while in Reverse when foot is released from brake, even on slight inclines. Multiple owners report this pattern; dealers have stated it is normal for the model.
When: Occurs at various mileages including 24,100 miles and 30,000 miles
Symptoms owners cite: Vehicle rolls backward in Drive with brake released; Vehicle rolls forward in Reverse with brake released; Occurs on slight inclines; Can result in collision with other vehicles or property
Recalls/TSBs owners mention: Dealers stated this is normal design and nothing can be done; dealer stated it is design feature to improve fuel economy
Unintended Vehicle Movement from Park
Vehicle shifts out of Park and moves (rolls forward or backward) while parked with engine running or off. Serious safety incidents reported including vehicle crashing through fence and garage door.
When: Can occur at any mileage while vehicle is parked
Symptoms owners cite: Vehicle suddenly shifts out of Park; Vehicle rolls backward or forward while parked; Occurs while vehicle is running in driveway; Can happen with engine off
Repairs/costs cited: One vehicle held at dealership for 20 days with no repair completed
Recalls/TSBs owners mention: GM has not been responsive in at least one case involving vehicle damage; GM inspecting in property damage situations
Cracked Flex Plate
Flex plate (connects crankshaft to transmission) develops cracks that spread from crankshaft mounting bolts outward through stamped steel cutouts. Second occurrence reported in same vehicle.
When: First failure at 48,929 miles; second failure on same vehicle at later mileage
Symptoms owners cite: Cracks beginning at crankshaft mounting bolts; Cracks spreading to stamped steel cutouts; Repeated failure in same vehicle
Repairs/costs cited: First repair cost $661.69; 3800 Series II V-6 engine, well-maintained vehicle
Synthesized from 33 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 1 most recent
The contact owns a 2005 Chevrolet Impala. The contact stated while driving at an undisclosed speed, the instrument panel became inoperable. The contact stated that several unknown warning lights were illuminated. The contact stated that while driving at an undisclosed speed, the vehicle unexpectedly downshifted. There was no warning light illuminated. The vehicle was taken to an independent…
Had powertrain trouble with your 2005 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 2005 Chevrolet Impala?
It's a meaningful issue. 33 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 24 complaints that reported odometer mileage, most powertrain failures cluster between 44,000 and 141,000 miles, with the median around 90,000. A quarter of owners report trouble before 44,000; a quarter make it past 141,000. 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/2005/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.