Owners describe a dangerous pattern: the engine shuts down without warning at any speed, from city streets to 80 mph expressways, with complete loss of power, steering, and brakes. No check-engine light warns you. You restart and it runs fine—until it happens again. Some owners have experienced this repeatedly over years of ownership.
The ignition switch is the leading suspect. Owners report keys stuck in the ignition, keys that won't release, ignition switches too stiff to operate, and keys that slip out of the ON position. The electrical system also generates phantom warning lights—power steering, traction control, brake, ABS, check engine all flashing together—while gauges bounce wildly. Many owners say dealers cannot reproduce these problems or find any diagnostic codes, leaving repairs unresolved.
Post-recall failures are particularly worrying. After paying for the ignition switch recall, multiple owners report the stalling returned worse than before, or new problems emerged like total battery drain and ECM failure. Water leaks into the electrical system cause condensation on dashboards and radio shorts. Power windows fail, door locks cycle on their own, and heater fans make noise.
Dealers often deny the problem exists or blame the owner, even when presented with online complaints from dozens of other Cobalt owners. GM's response has been inconsistent—recalls issued, then expanded—but owners still experience the failure. One owner paid over $400 for battery replacements in 18 months because the electrical system drained it repeatedly. The bottom line: this car's electrical system is unpredictable and, owners say, puts lives at risk.
Failure modes owners describe
Engine stalls without warning while driving
Vehicle loses all power and shuts down during operation at various speeds, sometimes on highways at 65-80 mph, with no warning lights. Power steering, brakes, and electrical systems fail simultaneously. Owners report having to restart the vehicle after pulling over.
When: Throughout ownership; some owners report first occurrence within 30,000 miles, others at higher mileage
Symptoms owners cite: Complete loss of engine power; No warning check engine light beforehand; Loss of power steering; Loss of brake power assist; Loss of all electrical power; Vehicle restarts normally after pull-over
Codes mentioned: No codes present in many cases, P0604 (Control Module RAM Failure), P0606 (Internal Controller Failure)
Repairs/costs cited: Dealership replaced ignition switch in some cases; GM attempted magnetic device retrofit and plastic key insert; ECM reprogramming attempted in other cases; some owners replaced ignition column and key
Recalls/TSBs owners mention: GM Recall 13454 (Ignition Switch); Recall 14063 (Expansion Recall); Recall 14V171000 (Electrical System); Recall 10V073000 (Power Steering); Recall 14E021000 (Electrical System); owners report recall repairs did not resolve stalling
Ignition switch failure and key issues
Ignition switch malfunction causing difficulty starting, key stuck in ignition, key not releasing, or ignition shifting out of proper position. Some owners report ignition switch rotating unexpectedly, requiring multiple attempts to start.
When: Early in ownership; some within first week of purchase, others after months or years
Symptoms owners cite: Key difficult to insert or turn; Key stuck in ignition; Key will not disengage from ignition; Key slipping out of OFF position; Ignition switch stiff to operate; Key hangs up when inserted; Multiple attempts required to start
Repairs/costs cited: Dealership applied WD-40 to ignition hole; replaced ignition switch; attempted plastic piece around ignition; replaced entire ignition column; added magnetic device to keep key from moving
Recalls/TSBs owners mention: GM Recall 13454 (Ignition Switch Lock Cylinder & Key); Recall 14V171000; owners report multiple recall attempts with recurring failures
Anti-theft system malfunction and lock display
CD player locks up and displays LOCK status unpredictably. Dashboard displays LOCK icon causing owner fear that anti-theft function may shut off fuel supply. Anti-theft light activates randomly; security light comes on and car shuts down.
When: Intermittent; triggered by rough roads or no apparent reason
Symptoms owners cite: CD player locks and displays LOCK; LOCK appears on radio display; LOCK icon appears on dashboard; Anti-theft light activation; Security light illumination; Engine shutdown when security light comes on
Repairs/costs cited: Dealership unable to diagnose when problem does not occur during service visit; owner stopped using CD player due to persistent locking
Recalls/TSBs owners mention: Recall 14V047000 (Air Bags, Electrical System); owners report dealer denies any problem exists
Power steering failure and loss of steering control
Power steering suddenly fails or becomes difficult to control while driving, sometimes with power steering warning light illumination. Owners report loss of power steering requiring excessive force to steer vehicle to safety.
When: Can occur suddenly without warning; some owners report occurrence after power steering recall work
Symptoms owners cite: Power steering warning light illumination; Loss of power steering assist; Difficulty turning steering wheel; Steering wheel lockup; Loss of steering control
Repairs/costs cited: Dealership replaced steering column and motor in multiple visits; some failures recurred within three weeks of repair
Recalls/TSBs owners mention: Recall 10V073000 (Steering: Electric Power Assist System); some VINs excluded from recall; owners report problems continued after recall work
Dashboard and instrument cluster malfunction
Dashboard displays erratic warnings and gauge movements. Gauges (speedometer, tachometer, fuel gauge, temperature) cycle or jump up and down. Multiple warning lights flash simultaneously. Power steering, traction control, brake, ABS, and check engine lights illuminate together.
When: Intermittent; can occur multiple times per week or once every six months
Symptoms owners cite: Gauges move up and down erratically; Speedometer fluctuation; Tachometer fluctuation; Fuel gauge fluctuation; Temperature gauge incorrect reading; Multiple warning lights flashing; Dashboard panel lights cycling; Power steering message on display; Traction control light activation; Brake light activation; ABS light activation; Check engine light activation; REDUCED ENGINE POWER message
Codes mentioned: Modules not communicating, Error codes present but dealer unable to locate specific problem
Repairs/costs cited: Dealer reprogramming of computer; battery cable removal overnight to reset; removal and reinsertion of battery terminal; replacement of body control module; one shop charged $100 to reset all computers
Recalls/TSBs owners mention: Recall 14V171000; owners report dealer states they cannot find root cause despite multiple diagnostic attempts
Engine shutdown with reduced power messages
Engine power shuts down or reduces suddenly during driving, often with dashboard display showing ENGINE DISABLED, ENGINE LOSING POWER, or REDUCED ENGINE POWER. Vehicle loses acceleration capability and becomes difficult or impossible to drive.
When: Can happen progressively more frequently once started; some after heavy rain
Symptoms owners cite: Engine disabled message on display; Engine losing power message; Reduced engine power message; Loss of acceleration; Engine cannot maintain speed; Engine hesitation during turning
Repairs/costs cited: One owner reports diagnostic specialist suggested computer chip in key may be corrupted, potentially from cell phone proximity; recommended key replacement and full ignition column replacement
Recalls/TSBs owners mention: Dealers downplay concerns and suggest throttle or engine problems instead
Stalling and jerking during acceleration and shifting
Vehicle stalls at stop lights and signs or jerks violently during low-speed acceleration. Hard transmission shifts that jerk passengers. Vehicle acts like it is going to die while driving. Transmission shifts very hard like it will tear something up.
When: Intermittent; can occur at various speeds; some owners report onset after recall service
Symptoms owners cite: Stalling at stop lights; Stalling at stop signs; Jerking during low-speed driving; Jerking during acceleration; Hard transmission shifts; Loss of power during driving; Engine hesitation; Vehicle lurches
Codes mentioned: Error codes displayed, Codes not reproducible by dealer
Repairs/costs cited: Dealer replaced shifter assembly in one case; suggested transmission issue but unable to confirm; owners report manually shifting transmission to prevent stalling
Recalls/TSBs owners mention: Recall 13454 includes expansion for stalling issues; owners report problem continues after recall work
Electrical system causing battery drain
Battery drains completely despite recent replacement. Vehicle fails to start with electrical system issue but radio and other accessories function. No check battery warning light. Owners report paying hundreds for multiple battery replacements in short timeframe.
When: Intermittent; some owners report battery problems after key left in ACC or OFF position
Symptoms owners cite: Battery completely dead with no starting capability; Radio and accessories work but engine won't turn over; No check battery warning light; Battery drained overnight; Rapid battery drain
Repairs/costs cited: Battery replaced multiple times; ignition switch identified as cause by owner; one owner paid over $400 for batteries in 18 months
Recalls/TSBs owners mention: Dealers suggest battery replacement without addressing root cause; one owner notes battery location in trunk with poor air circulation may contribute
Door lock malfunction and electronic lock cycling
Door locks engage and disengage by themselves repeatedly without operator input. Unlock button does not work. Fuses appear intact but locks cycle uncontrollably.
When: Intermittent; some owners report removing fuse to stop automatic cycling
Symptoms owners cite: Locks cycle up and down by themselves; Door unlock button non-functional; Locks engage and disengage repeatedly; Unset anti-theft system from lock cycling; Door locks and unlocks create security vulnerability
Repairs/costs cited: Fuse checked and found intact; owner removed fuse to prevent cycling and now must manually lock all doors
Power window failure and motor burnout
Power windows malfunction or fail to operate. Window motors burn out. Driver-side rear power window becomes inoperable.
When: Early in ownership; some owners report multiple window failures
Symptoms owners cite: Power windows non-functional; Window motor burnout; Driver-side rear window inoperable
Repairs/costs cited: Window motors replaced
Heater blower motor and defrost issues
Heater fan does not function on initial purchase. When replaced, makes whining noise on setting 1. Rear defogger quits working and fuse replacement does not fix it.
When: From new vehicle purchase; defrost issue occurred after years of ownership
Symptoms owners cite: Heater fan non-functional; Heater fan whining noise; Rear defogger non-functional
Repairs/costs cited: Dealership took parts from brand new vehicle to replace defective heater fan; replaced fuse and relay switch for rear defogger with no resolution
Radio/CD player and display lock/malfunction
Radio locks up and displays LOCK status. Radio won't work when LOCK appears. Requires turning car off and back on to reset. Radio shorted out twice from water intrusion damage.
When: Intermittent; triggered by rough roads or moisture intrusion
Symptoms owners cite: Radio locks up; LOCK appears on display; Radio refuses to work; Radio shorts out from water intrusion; Clock won't display when LOCK active
Repairs/costs cited: Owner stopped using CD player due to persistent locking; radio replaced twice due to water intrusion damage
Vehicle fails to start - no electrical response
Vehicle will not start; electrical system goes haywire in morning. No lights, no sounds, complete electrical shutdown. Engine will not turn over despite all other lights and accessories functioning.
When: Multiple occurrences reported; some in morning, some after extended parking
Symptoms owners cite: No electrical response; Engine won't turn over; All gauges dead; Electrical system haywire; No cranking or clicking sounds; Complete electrical failure
Repairs/costs cited: Dealer required vehicle be towed (not jumped) to diagnose; ignition module replaced in one case; owner required to drive to dealer while problem occurring
Post-recall complications and ECM failure
After ignition recall service, vehicle develops new electrical problems. Ignition becomes stiff and difficult to operate. Key deprogramming occurs. ECM failure with control module RAM and internal controller failures after recall service.
When: Within hours to days after recall service completion
Symptoms owners cite: Stiff ignition operation; Key hangs up when inserted; Random hesitation during U-turns; Vehicle won't start after recall; Key deprogrammed; Anti-theft light activated; Sudden random ignition switch clicks; Door locks engaging; Dashboard flashing; Key locked in ACC mode position; Key won't turn to OFF position; Battery drained by tow truck arrival
Codes mentioned: P0604 (Control Module RAM Failure), P0606 (Internal Controller Failure)
Repairs/costs cited: ECM reprogramming performed; theft relearn and crank variation learn completed; dealer recommends ECM replacement if problem recurs
Recalls/TSBs owners mention: Recall 14113 (Ignition Switch); owners report ECM failure after recall work; dealer notes other owners experienced same issue post-recall
Synthesized from 180 NHTSA owner complaints — unverified consumer
allegations, summarized for patterns. The verbatim filings appear below.