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 ↗2006 Chevrolet Monte Carlo powertrain problems
severe 26 complaints filed with NHTSA · avg repair $2,500 · see powertrain across all vehicles →
Failure mileage
Complaints
26
Recalls
0
Avg fix
$2,500
2injuries
When does it fail?
Of the 26 powertrain complaints filed for the 2006 Chevrolet Monte Carlo, 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
Owners have filed 26 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.
Powertrain accounts for 23% of all owner complaints filed against this vehicle, across 7 categories tracked.
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
The 2006 Monte Carlo has widespread transmission problems starting as early as 20,000 miles. Owners describe the transmission slipping on acceleration, then slamming hard into gear—usually between 1st and 2nd. This happens at stops, during merges, and sometimes while cruising. The front end shudders when it shifts. Some cars need replacement transmissions before 100,000 miles, and at least one owner is on the third replacement already.
Torque converter failure appears to be a root cause. Mechanics report that aftermarket converters aren't available, forcing complete transmission replacement. One owner's transmission failure prevented acceleration during a highway merge, forcing the car off the road.
Oil pressure sensors fail repeatedly—one owner replaced the same sensor four times in 15,000-mile intervals. The engine also consumes 1–1.5 quarts per 1,000 miles, even after ring and piston replacement.
Safety issues round out the picture: one owner's transmission sensor overrode the brakes, nearly causing a crash. Others report random engine shutoff (3–5 times daily in one case), loss of acceleration response, and transmission that won't lock in Park. Shift levers are stiff, requiring two hands. RPMs fluctuate at steady speeds and under cruise control, yet dealers insist this is normal.
Same Chevrolet Monte Carlo powertrain reports on nearby years: 2007
Failure modes owners describe
Transmission slipping and hard shifts (1st–2nd gear)
Transmission slips on acceleration from stops, then slams or lurches hard into the next gear. Occurs primarily during 1st-to-2nd gear transition. Some owners report it happens 50% of the time; others report hesitation followed by hard engagement. Shuddering and shaking of front end noted during shifting. Fluid is typically clear and full.
When: Observed at 45,000 to 93,000 miles; some cases as low as 20,000 miles
Symptoms owners cite: Transmission slips on acceleration from stop; Hard shift or lunge into gear; Grinding noise during shift; Shuddering or shaking of front end during shift; Hesitation before engagement; Occurs primarily 1st–2nd gear transition; May occur 50% of the time or intermittently
Repairs/costs cited: Transmission replacement required in multiple cases. Some owners report replacement at 20k–90k miles, with some on 2nd or 3rd replacement transmission already.
Recalls/TSBs owners mention: Dealer quoted $2,900–$5,100 for repair; one offered to cover expenses over $2,000. Acknowledged as 'known issue' by dealer in at least one case. No recalls issued for this specific failure.
Torque converter failure
Torque converter fails, preventing proper transmission engagement. Owner reported inability to accelerate during merge maneuver; in another case, failure occurred while attempting acceleration to avoid another driver. Mechanic confirmed torque converter as root cause; replacement requires full transmission replacement due to unavailable aftermarket torque converters.
When: Observed at 85,000 to 93,000 miles
Symptoms owners cite: Transmission fails to accelerate as intended; Loss of power during acceleration attempt; Inability to merge or accelerate when needed
Repairs/costs cited: Full transmission replacement required; aftermarket torque converters unavailable, forcing complete unit replacement.
Oil pressure sensor failure (repeated)
Oil pressure sensor fails, causing shuddering noise during acceleration. One owner replaced this component at least four times within relatively short intervals (initially around 145,000 miles, then recurring every ~15,000 miles).
When: Initially observed around 90,000–145,000 miles; recurs frequently thereafter
Symptoms owners cite: Shuddering noise while accelerating; Multiple sensor failures in short sequence
Repairs/costs cited: Sensor replacement. Owner on 4th replacement in short timeframe.
Transmission override sensor malfunction (safety hazard)
Transmission sensor overrides braking, causing vehicle to not stop. Owner had to shift to neutral to maintain control. Described as a critical safety failure that nearly caused an accident.
When: Observed around 36,000 miles
Symptoms owners cite: Vehicle will not stop despite brake application; Brake override—acceleration when braking intended; Loss of vehicle control
Repairs/costs cited: Warranty repair obtained after extended negotiation with dealer.
Recalls/TSBs owners mention: Eventual warranty coverage after owner had to 'fight with Chevy for several weeks.'
Engine stalling (random shutoff)
Engine shuts off randomly while driving, multiple times per day (3–5 times daily reported). Dealership rebooted computer system multiple times without resolution. Owner must shift to neutral and restart while coasting. Owner suspects correlation with GM recall on ignition system.
When: Timing not specified; owner suggests multiple incidents per day
Symptoms owners cite: Random engine shutdown while driving; No warning before shutoff; Occurs 3–5 times per day in severe cases; Steering and braking also affected during shutdown
Repairs/costs cited: Dealership computer reboots attempted; no resolution achieved.
Recalls/TSBs owners mention: Owner suspects GM recall involvement but not explicitly confirmed by manufacturer.
High oil consumption
Vehicle consumes oil rapidly, running low 1–1.5 quarts every 1,000 miles before oil change interval. Owner conducted oil consumption test at 40,000 miles. Issue persisted after rings and pistons were replaced at 92,000 miles.
When: Observed by 40,000 miles; ongoing after engine work at 92,000 miles
Symptoms owners cite: Low oil level between service intervals; Consumption of 1–1.5 quarts per 1,000 miles
Repairs/costs cited: Oil consumption test performed. Rings and pistons replaced at 92,000 miles; issue continued after repair.
Shift linkage stiffness (gear shift difficult)
Gear shift lever is extremely difficult to move between positions (Park to Drive or vice versa). Owner must use two hands to shift. Shift button very hard to push.
When: Not specified
Symptoms owners cite: Difficulty shifting between Park and Drive; Requires two hands to shift gears; Shift button extremely hard to depress
Transmission will not lock in Park
Vehicle placed in Park does not lock into gear. Driver can remove key while transmission not engaged; gears move freely without locking.
When: On several occasions (frequency unclear)
Symptoms owners cite: Park does not lock transmission; Gears move freely without engagement; Key can be removed while transmission unlocked
Computer malfunction (false temperature reading)
Vehicle computer incorrectly reads outside temperature as -38 to -40 degrees Fahrenheit during summer, forcing heating system to run. Dealer indicated computer failure requiring expensive replacement.
When: Around 41,000 miles
Symptoms owners cite: False temperature sensor reading (-38 to -40°F in summer); Heating system runs inappropriately
Repairs/costs cited: Computer replacement quoted at high cost; owner declined.
Torque converter–related driveline clunk and lunging
Vehicle lunges forward or backward with force upon purchase. Dealer initially found no failures, then identified defective torque converter. Repair involved transmission rebuild, but motor mount, transmission, and steering column issues were noted but not fully addressed.
When: Observed immediately after purchase (failure mileage 7 miles); current mileage 35,000
Symptoms owners cite: Violent lunge forward or backward; Persistent after first dealer visit
Repairs/costs cited: Transmission repaired; motor mount and steering column issues noted but not fully resolved.
Recalls/TSBs owners mention: Manufacturer stated engineers would receive information from dealer to investigate root cause; no resolution documented.
Accelerator pedal unresponsiveness
Accelerator pedal fails to respond when depressed. Vehicle will not accelerate despite pedal input. One incident prevented safe highway merge, forcing driver off road. No warning light; issue recurred after engine restart.
When: Observed at 200,000 miles in one case; at 87,000 miles in another
Symptoms owners cite: Pedal depression produces no acceleration response; No warning light; Hesitation followed by jerking acceleration in some cases; Issue recurs after restart
Repairs/costs cited: No repair documented in one case; complaint not investigated.
Recalls/TSBs owners mention: Dealer informed owner no recalls existed for this failure.
RPM fluctuation under cruise control and steady speeds
Vehicle exhibits RPM fluctuation at steady speeds and under cruise control. When descending grades, vehicle pulsates and RPMs fluctuate, then clears. Owner reports this abnormal behavior; dealer and GM claimed it was normal operation.
When: Since new (from purchase in July 2006)
Symptoms owners cite: RPM fluctuation at steady speeds; Pulsation and RPM fluctuation on descents under cruise control; Issue clears after pulsation stops
Recalls/TSBs owners mention: GM and dealer stated this behavior was normal.
Unwanted acceleration when stopped
Vehicle accelerates on its own when stopped, even without driver input. Occurred since the car was new.
When: Since new (July 2006)
Symptoms owners cite: Unintended acceleration while stopped
Synthesized from 26 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 2 most recent
Tl* the contact owns a 2006 Chevrolet monte carlo. The contact stated that she noticed a shuttering noise while accelerating from a traffic stop. The vehicle was taken to an independent mechanic for diagnostic testing where the mechanic replaced the oil pressure sensor. The approximate failure mileage was 90,000. Updated 12/03/12*bf the consumer stated the vehicle had low oil, before an oil…
At a complete stop. When taking off car will hesitate and then jolt forward very hard before taking off. Also dash coming up from the seams
Had powertrain trouble with your 2006 Chevrolet Monte Carlo?
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 Monte Carlo?
It's a meaningful issue. 26 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 23 complaints that reported odometer mileage, most powertrain failures cluster between 60,000 and 100,000 miles, with the median around 87,000. A quarter of owners report trouble before 60,000; 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/2006/Chevrolet/Monte Carlo.
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.