My 2017 Chevy malibu has periodically showed a reduced power mode alert in the dash while driving and then the car drops down to under 40 MPH and when I push the gas it won't accelerate. The check engine light comes on every time but within days it goes off and drives fine until it happens again with no warning. My husband was driving 70 on the interstate when it first happened and almost wrecked…
2017 Chevrolet Malibu powertrain problems
moderate 137 complaints filed with NHTSA · avg repair $2,500 · see powertrain across all vehicles →
Failure mileage
Complaints
137
Recalls
0
Avg fix
$2,500
When does it fail?
Of the 137 powertrain complaints filed for the 2017 Chevrolet Malibu, 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 137 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.
Among the 20 model years of Chevrolet Malibu in our records for powertrain problems, this one ranks #3 by owner-complaint volume.
The failure pattern owners describe
Buyer takeaway: A 2017 Malibu powertrain can fail suddenly and dangerously—power loss on the highway, false "shift to park" errors that strand you with a dead battery, brake failures, and recurring sensor faults are widely reported even at low mileage. Dealers often claim they don't know the root cause and won't cover repairs out of warranty, despite evidence of known defects; plan for significant repair costs and safety risks before buying used.
The 2017 Malibu powertrain generates two major complaint streams: sudden power loss and shifter control failures, both appearing across a wide mileage range and creating real hazards.
Power loss incidents hit without warning. Drivers report the engine cuts to limp mode (20–40 mph) on busy highways at cruising speeds, forcing emergency shoulder pulls. A check-engine light and "reduce engine power" message appear; shutdown and restart temporarily restore function, but the fault recurs. Diagnostic codes point to throttle/accelerator pedal sensors (P2138, P2097, P2122, P2123, P2101), yet replacing these parts often doesn't stop the problem coming back weeks or months later. Several owners paid $500+ for sensor or pedal replacement only to face identical failures. One owner went through accelerator pedal replacements four times.
Shifter failures prevent vehicles from turning off. The dash displays "shift to park" even though the shifter sits in park, keeping the engine in auxiliary mode and draining the battery. Owners jiggle the shifter repeatedly or restart multiple times to clear the error. Dealers replace the shifter control assembly for $400–$700, but recurrence is common—one owner's 2019 repair failed again within years. GM issued service bulletin 19-NA-206 (deposit-scraping workaround) and acknowledges the issue exists; a class action lawsuit has been filed. Warranty denial is standard once coverage expires.
Secondary concerns include vacuum pump failures (rock-hard brake pedal, engine stall, pump debris destroying the camshaft), alternator voltage regulation faults causing cascading electrical failures, and transmission torque mismatches (6T40 installed instead of rated 6T45). Dealers consistently claim ignorance, clear codes without fixing root causes, and resist warranty coverage. Safety risk is acute: sudden power loss at 65+ mph, loss of power steering mid-turn, and inability to shut down the vehicle in high-temperature environments are documented.
Same Chevrolet Malibu powertrain reports on nearby years: 2014 · 2015 · 2016 · 2018 · 2019
Failure modes owners describe
Sudden power loss / reduced engine power in motion
Engine abruptly cuts power or enters 'limp mode,' dramatically reducing available acceleration. Typically happens on highway at cruising speeds (55–75 mph), forcing drivers to coast to the shoulder. Check engine light illuminates; 'reduce engine power' message displays on dashboard. Power usually restores after shutdown and restart, but failure recurs without warning or repair holds.
When: 50k–192k miles; mostly reported between 3k and 100k miles
Symptoms owners cite: Sudden loss of engine power while at highway speed; Car slows to 20–40 mph and will not accelerate; Check engine light illuminates; 'Reduce engine power' or 'engine power reduced' message on dashboard; Traction control light may illuminate; Power restored temporarily after shutdown/restart; Recurrence without permanent fix
Codes mentioned: P2138, P2097, P2122, P2123, P2101, C0242, U0401
Repairs/costs cited: Throttle/accelerator pedal sensor replacement cited; owners report repeated failures of same part. One owner paid $500+ for throttle pedal assembly replacement; another paid $300+ for same repair. Transmission and engine control module (ECM) replacement mentioned but not confirmed as effective. Fuel pump system replacement attempted in one case (estimated $500). Cold-weather fuel line freezing mentioned; dealer recommended $500 line service with no guarantee.
Recalls/TSBs owners mention: Dealership service bulletins 19-NA-206 referenced for shifter corrosion deposits. GM warranty denial common; one owner's extended warranty rejected claim citing oil consumption and bent valve as excluded. Multiple owners report dealerships claiming issue is a 'quirk' or unknown. Recall issued for some model years (2016–2020) for accelerator pedal, but coverage denied to vehicles over 150k miles despite ongoing problem.
Shift to Park false message / shifter control assembly failure
Vehicle displays 'Shift to Park' error message while already in park, preventing safe shutdown. Doors will not lock; auxiliary power remains on; battery continues to drain. Message may clear after jiggling shifter multiple times or restarting vehicle, but increasingly requires more attempts. Problem begins intermittently, worsens rapidly to permanent state.
When: 8.4k–145k miles; typically reported early in ownership; failures as early as first weeks
Symptoms owners cite: 'Shift to Park' message appears on dashboard after shifting to park; Vehicle will not turn off completely; Doors remain unlocked; Emergency lights remain on; Beeping sound from dash; Battery drain risk; Shifter feels stiff or requires forceful movement
Codes mentioned: Shifter control assembly error (no standard code cited)
Repairs/costs cited: Shifter control assembly replacement most common repair, costing $391–$700 per owner reports. One dealer scrapped deposits from electrical contacts (service bulletin 19-NA-206) as temporary fix. Some dealers installed jumper. Early failure of replacement parts noted; one owner reports problem recurring years after 2019 repair.
Recalls/TSBs owners mention: Service bulletin 19-NA-206 documented for deposit removal (manual thumb-scraping 50 times), jumper installation, or shifter control assembly replacement. GM denies warranty coverage beyond 3 years or bumper-to-bumper term despite known issue. Class action lawsuit filed (Rothschild v. General Motors LLC, US District Court Eastern District of New York) specifically for this defect. Multiple owners cite GM as aware of issue; dealers routinely state they have seen problem before.
Brake system / vacuum pump failure
Brake pedal becomes rock-hard or unresponsive; vehicle loses braking assist during operation. Engine power reduced message may appear simultaneously. Vacuum pump locks up, breaks internally, or leaks; shattered pump parts enter and destroy engine camshaft. Vacuum booster malfunction suspected. Related to low electrical voltage states.
When: Under 100k miles; one case at first major incident (January 2019, low mileage)
Symptoms owners cite: Brake pedal becomes solid and requires extreme force to apply; Loss of power steering assist; Loud ticking noise during braking; Vacuum pump grinding or locked-up noise; Engine power loss occurs simultaneously; 'Reduce engine power' message; Engine stalls
Codes mentioned: P2097
Repairs/costs cited: Vacuum pump replaced; part broken apart and fragments entered engine. In one case, camshaft destroyed by circulating pump debris. Gasket replacement tried but pump leaked. Dealer found condensation in radiator from coolant system. Owner out-of-pocket repair cost not specified; part availability and cost unknown.
Recalls/TSBs owners mention: Dealer acknowledged brake system vacuum issue; no recall action taken. Warranty coverage not specified.
Alternator / charging system voltage regulation failure
Vehicle electrical system maintains abnormally high voltage (14.8–15 volts) or abnormally low voltage (12.5–12.6 volts) for extended periods. Causes raw egg/sulfur smell in cabin (likely battery gassing); fogged windows; cascading failures in steering assist, anti-lock brakes, stability control, OnStar, and hybrid control processor. Hybrid inverter suspected; software updates attempted without resolution.
When: 24k miles (hybrid model); failures ongoing over weeks of dealer service
Symptoms owners cite: Voltage stays high (14.8–15 volts) for extended periods; Voltage drops and stays low (12.5–12.6 volts) for extended periods; Cabin windows fog up; Raw egg smell (sulfur) in cabin; Steering assist failure; Anti-lock brake system failure; Stabilitrack (stability control) failure; OnStar system failure; Electric drive unit error messages (hybrid)
Codes mentioned: Hybrid inverter fault, Electric drive unit error
Repairs/costs cited: Hybrid inverter diagnosed and software update applied; issue persisted. Dealer unable to identify root cause after 2+ weeks in shop. Unknown cost.
Recalls/TSBs owners mention: OnStar sent multiple error messages to owner; no manufacturer response documented. Dealership unable to resolve.
Engine stall / no-start failure
Engine cuts off while driving or at idle, leaving vehicle immobilized. Multiple start attempts may be required; jump-start sometimes necessary. Start/stop automatic shutoff feature malfunctions. Low mileage; often recurring without permanent repair.
When: 3k–67k miles; one case at 3k miles with no clear cause found
Symptoms owners cite: Engine shuts off suddenly while driving or stopped; Vehicle will not restart immediately; Multiple start attempts required; Jump-start may be necessary; Check engine light and unknown warning lights illuminate; Start/stop feature fails to function
Codes mentioned: Unknown; faulty sensor suspected in one case
Repairs/costs cited: Dealership diagnostics inconclusive in multiple cases. Sensor replacement attempted. No permanent fix achieved by owner's report.
Recalls/TSBs owners mention: Manufacturer not notified in most cases. Dealership unable to diagnose after multiple visits.
Transmission malfunction / torque mismatch
6T40 transmission installed instead of advertised 6T45. 6T40 rated for 177 lb-ft torque; engine produces 184 lb-ft, exceeding transmission capacity. Hard shifting reported. Owner alleges design flaw causing premature transmission wear and failure risk, especially in high-heat climates.
When: Present at purchase; hard shifting noted immediately in new vehicle
Symptoms owners cite: Hard or rough shifting; Transmission slipping (alleged in future failures)
Codes mentioned: Unknown (transmission torque mismatch, not diagnostic code)
Repairs/costs cited: No repair attempted; owner raised concern at purchase. Transmission replacement would be required to rectify mismatch (6T45 substitution), but not pursued.
Recalls/TSBs owners mention: GM customer service stated 6T40 and 6T45 are 'the same' despite technical specification differences. No action taken; no recall issued.
Accelerator pedal assembly failure
Accelerator pedal sensor or assembly malfunctions, causing loss of throttle response or sudden power reduction. Common early failure requiring replacement; identical problem recurs weeks to months after repair, suggesting design defect not resolved by parts swap.
When: Under 50k miles; recurring failures within weeks to months of repair
Symptoms owners cite: Loss of acceleration response when pedal pressed; Throttle unresponsive during pressing; Check engine light illuminates with throttle/pedal position sensor code
Codes mentioned: P2138
Repairs/costs cited: Accelerator pedal assembly or sensor replaced multiple times on same vehicle (one owner: 4 replacements). Repair cost cited as $500+ per replacement. Warranty coverage varies; some repairs out-of-pocket after warranty expiration.
Recalls/TSBs owners mention: Recall issued for 2016–2020 model years (letter sent 2019) for accelerator pedal; coverage limited to vehicles under 150k miles. Extended warranty denial common (cited in one case as unrecognized recurring fault).
Auxiliary battery negative cable failure
Auxiliary battery negative cable assembly (Part # 84085823) fails, causing complete power loss while driving on freeway. Part discontinued by GM; no replacement or aftermarket parts available despite extensive search. Dealer unable to repair for 6+ weeks; junkyard parts considered unsafe.
When: Regular service; failure occurred after several years of reliable operation
Symptoms owners cite: Complete loss of electrical power while driving at highway speed; Vehicle unresponsive; must be towed
Codes mentioned: Unknown
Repairs/costs cited: Part # 84085823 (Auxiliary Battery Negative Cable Assembly) failed. Part discontinued by GM; unavailable through dealers, E-Bay, Amazon, AC Delco, or major auto part chains. Dealership considered junkyard part as last resort. Original part cost ~$50 when in production.
Recalls/TSBs owners mention: GM discontinued the part; directed dealer to source from junkyard. No alternative solution provided.
Water intrusion into cabin / electrical short
Water enters vehicle interior from rear tail lights or dome light; causes interior wetting and window fogging. Root cause undetermined by dealership. Related to transmission control assembly failure in same vehicle.
When: 145k miles
Symptoms owners cite: Water visible inside vehicle; Wet interior carpeting and surfaces; Windows fog up
Codes mentioned: Unknown
Repairs/costs cited: Initial repair completed; water source at rear tail lights and dome light sealed. Moisture caused persistent fogging; second visit to dealership unable to determine root cause or resolve fogging.
Recalls/TSBs owners mention: None documented.
Emission system fault (P2097) – unresolved
Recurring P2097 emission code; vehicle fails state inspection due to emissions problem. GM admits not knowing the cause. Problem began at very low mileage (3k miles) on brand-new vehicle and remains unresolved after multiple repair attempts over nearly 2 years.
When: 3k–low mileage; owned less than 2 years at time of complaint
Symptoms owners cite: Check engine light illuminates; Vehicle fails state emissions inspection; Code P2097 recurs despite clearing
Codes mentioned: P2097
Repairs/costs cited: Multiple repair attempts by dealership; GM technicians admit not knowing cause. No permanent solution achieved. Owner alleges financial and personal hardship resulting from vehicle defect.
Recalls/TSBs owners mention: GM admits not knowing the issue. No recall or warranty coverage documented.
Synthesized from 137 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 5 most recent
Car voltage stays very high (between 14.8 and 15 volts) for extended periods of time. At which point the windows have fogged up and there is a raw egg smell in the cabin - probably Sulfur. Both the hybrid and the 12v car battery are located in the truck and there are vents that draw air from the cabin to ventilate those batteries. The car voltage will also stay at 12.5 to 12.6 for extended…
Reduced engine power warning 12/29/20 plus numerous occurrences in 2019 while driving on the highway; vehicle slows to 40mph without warning shift to park warning when vehicle already in park, can't shut off vehicle until it recognizes park, often taking upwards of 10 minutes of repeated shifting stabilitrack sensor warning and loss of cruise control, at highway speeds
Driving on highway at about 65 mph on family trip to Delaware. . Car suddenly gave reduced acceleration error and speed started declining while in traffic. No warning.checked chevron app on phone and it did not see anything wrong. There was NO check engine or anything. Got to a dealer and they said it was probably a sensor for gas pedal. 5 days later driving home to Georgia from trip on highway…
Dash warning says action required....shift to park. But the car is already in park. Car will not shut off til you get it in park. Sometimes need to start and restart car a dozen times to get it to stop the error. This is a known problem with late model malibu's. Tsb # 19-na-206. Repair cost approximately $300. This happens at random times, making the vehicle unreliable. Need to do a recall!
Had powertrain trouble with your 2017 Chevrolet Malibu?
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 2017 Chevrolet Malibu?
It's a documented issue but not catastrophic. 137 complaints have been filed. Repairs average $2,500 and most owners catch it before it causes a breakdown.
At what mileage does the powertrain typically fail?
Across the 74 complaints that reported odometer mileage, most powertrain failures cluster between 32,000 and 70,000 miles, with the median around 50,000. A quarter of owners report trouble before 32,000; a quarter make it past 70,000. 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/2017/Chevrolet/Malibu.
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.