Owners of 2007 Impalas report widespread electrical failures that span the ignition system, engine management, and multiple warning lights. The most common complaint is the ignition switch: keys stick, refuse to turn, eject randomly, or break inside the lock. Some engines continue running after the key is removed. Brake Transmission Shift Interlock (BTSI) solenoid failures prevent vehicles from shifting out of Park, compounding the stuck-key problem.
Engine power cuts out abruptly—the "Reduced Engine Power" message appears, dropping the car to 5–10 MPH on highways or in traffic, sometimes repeatedly and with no pattern. One owner replaced the throttle position sensor, another the accelerator pedal, but episodes recurred. Stalling while driving occurs without warning, sometimes post-recall repair, and restarts may need jump-starts or multiple attempts.
The rear window defroster connector burns and melts from the inside out, creating a fire hazard near the passenger kick panel. Chevrolet acknowledged this as "common," but issued no recall. Multiple YouTube videos show owners bypass the burned connector with jumper wires.
Dashboard warning lights—airbag, tire pressure, check engine, traction control—illuminate in cascades, sometimes with no actual failure. Headlights flicker or fail after being physically jarred. One owner replaced the battery, starter, and alternator yet the electrical shutdown persisted. Another lost radio, chime, and turn-signal sounds after tightening a loose battery cable. Dealers often cannot replicate failures or pinpoint causes. Recall parts (14V355000) took 30–60 days or longer to arrive, leaving owners stranded with known defects.
Failure modes owners describe
Ignition switch failure and key sticking
The ignition switch fails to turn, release, or rotate properly. The key becomes lodged in the ignition, refuses to turn over, or ejects intermittently. In some cases, the engine continues running after the key is removed, or the key breaks inside the switch.
When: Intermittent; reported from early ownership to high mileage (33k-190k miles)
Symptoms owners cite: Key stuck in ignition; Key will not turn to start vehicle; Key ejects from ignition intermittently; Engine runs after key is removed; Key fractures or breaks inside ignition; Forced removal of key required
Codes mentioned: NHTSA Campaign 14V355000 (Electrical System)
Repairs/costs cited: Dealers diagnosed broken wires in BTSI (Brake Transmission Shift Interlock) solenoid terminals, faulty actuators, and shift control solenoid failures. Some repairs involved BTSI harness rerouting; others required solenoid or switch replacement. Recall parts were unavailable for extended periods (30-60+ days). One owner reported needing to unhook the battery terminal to shut off vehicle.
Recalls/TSBs owners mention: NHTSA Campaign 14V355000 (Electrical System) issued; TSB 08-07-30-007A addressed BTSI harness routing. Parts availability was a major problem; manufacturers stated uncertain timelines. Recall required original keys only in some cases.
Reduced Engine Power / Limp mode activation
Without warning, the engine goes into limp mode, dropping power dramatically and limiting acceleration. The 'Reduced Engine Power' message appears on the dash along with check engine light and other warning lights. Vehicle slows to 5–10 MPH or loses power entirely and becomes unsafe to drive.
When: Intermittent; reported from 34k to 112k miles; some owners report weekly or multiple occurrences per week
Symptoms owners cite: Vehicle suddenly slows to 5–10 MPH; Loss of acceleration ability; Cannot drive faster than 5–10 MPH; Check engine light illuminates; Traction control light comes on; Engine light clears after turning vehicle off for 10 minutes; Recurring episodes with no clear pattern
Codes mentioned: P0606, P0641
Repairs/costs cited: Owners replaced throttle position sensors, accelerator pedal assemblies, and had throttle bodies cleaned. One owner reported performing extensive diagnostics (checking sensor wires for 5V, inspecting grounds, checking fuses, wiggling connectors) with no resolution. Another owner replaced the accelerator pedal position sensor after first event but experienced recurrence. Repairs often temporary or unsuccessful.
Engine stalling during driving
Engine stalls without warning while driving at various speeds (25–60 MPH), forcing the driver to pull over. Stalling may occur after recall repair, and restart may require multiple attempts or jump-starting. Some vehicles stall repeatedly even after dealer repairs.
When: Intermittent; reported at 33k–190k miles; some incidents occur post-recall repair
Symptoms owners cite: Engine shuts off without warning; Loss of steering power assist; Loss of power brakes; Instrument panel sensors illuminate intermittently before stall; Vehicle requires multiple restart attempts; Jump-start required to restart; Stalling continues even after repair attempts
Codes mentioned: NHTSA Campaign 14V355000 (Electrical System)
Repairs/costs cited: Dealers replaced the engine motor on at least one vehicle without resolving the issue. One owner took vehicle to independent mechanic who also was unable to fix repeated stalling. Technicians unable to duplicate or diagnose the failure in multiple cases. One owner reported stalling persisted even after recall repair.
Recalls/TSBs owners mention: NHTSA Campaign 14V355000 (Electrical System) issued; however, recall parts were unavailable for months, and in some cases owners were told manufacturer was uncertain when parts would arrive.
Rear window defroster connector overheating and burning
The electrical connector for the rear window defroster, located near the passenger kick panel, overheats and charred due to improperly sized connector pins in the wiring harness. The plastic housing melts, creating a burning smell and scorching the interior carpet. This is documented as a widespread issue on ninth-generation Impalas.
When: Occurs when rear defroster is activated; reported at various mileages
Symptoms owners cite: Burning smell when defroster is turned on; Visible charring of connector plastic; Melted wires and connector ends; Scorched carpet under connector; Defroster stops working after burning event
Repairs/costs cited: No factory repair documented. Owners report Chevrolet acknowledged it is a 'common problem' but issued no recall. Shade-tree repairs bypassing the connector with jumper wires are documented on YouTube and internet forums. Owners describe this as a widespread, documented issue on ninth-generation Impalas.
Recalls/TSBs owners mention: Chevrolet acknowledged the defect as a 'common problem' but refused to issue a recall. Owner stated manufacturer 'would not acknowledge the defect.'
Remote keyless entry and remote start failure
Remote keyless entry and remote start functions cease to work beyond 10 feet from the vehicle, or stop working altogether. One owner's remote start failed immediately; another experienced simultaneous TPMS warning light issues.
When: Early ownership; reported at 7,800 miles on one vehicle
Symptoms owners cite: Remote keyless entry inoperable beyond 10 feet; Remote start does not function beyond 10 feet; Simultaneous TPMS warning light activation; Antenna replacement recommended but part unavailable
Repairs/costs cited: Dealer identified antenna as needing replacement but part was unavailable for undetermined time. Dealer could not confirm the antenna replacement would actually solve both issues. One owner tried factory remote start—it would not work, so had to use key to start vehicle.
Brake Transmission Shift Interlock (BTSI) solenoid failure
The shifter becomes locked in Park and cannot be moved into any other gear. Key cannot be removed from ignition. Caused by broken wires in the BTSI solenoid terminal, incorrectly routed BTSI wiring harness, or tangled wiring looms that stress connector pins.
When: Intermittent; reported at 44k, 62k, 71k, and 75k miles
Symptoms owners cite: Shifter stuck in Park; Cannot move gear selector; Key stuck in ignition and cannot be removed; No transmission movement possible
Repairs/costs cited: Dealers replaced faulty actuators (some twice), shift control solenoids, and shifter assemblies. One owner reported BTSI solenoid wires broke a second time after initial repair. TSB 08-07-30-007A instructs rerouting BTSI wiring harness to relieve stress on connectors and inspect for wire damage or crimping.
Recalls/TSBs owners mention: TSB 08-07-30-007A issued for 2007–2009 Impala models addressing BTSI harness routing and wire inspection.
Electrical system faults and cascading warning lights
Multiple warning lights illuminate simultaneously on the instrument panel (airbag, tire pressure, brake system, engine temperature, check engine, traction control), sometimes even when no actual fault exists. Instrument panel may flicker or fail temporarily. Dash displays false fault codes.
When: Intermittent; reported from 37k to 190k miles
Symptoms owners cite: Multiple warning lights illuminate at once; Service airbag light comes on; Service tire pressure warning illuminates; Check engine light appears; Traction control warning activates; Instrument panel flickers or goes dark briefly; False 'Engine Hot' and 'AC Off' messages displayed; All indicators illuminate when air bag light turns on
Codes mentioned: P0606
Repairs/costs cited: Dealers unable to find mechanical cause. One owner was charged $89 diagnostic fee but no repair was performed (vehicle out of warranty). Replacing thermostat did not resolve false 'Engine Hot' messages. Technicians often could not duplicate the failures.
Headlight electrical failure
Headlights fail intermittently or completely. Lights work after physical jarring or rapping on the headlight housing, suggesting a loose connection or poor contact issue. Brights may work when low beams do not.
When: Intermittent; reported at 12,000+ miles
Symptoms owners cite: Passenger or driver headlight fails; Both headlights fail simultaneously; Lights come on only after tapping headlight housing; Brights work when low beams do not; Intermittent failure suggests loose connection
Repairs/costs cited: Physical jarring of headlight housing temporarily restores function. Suggests poor connection at headlight switch or connector. Owner describes this as unsafe, especially during night driving or in emergencies.
Battery and charging system faults
Vehicle experiences sudden power loss with multiple warning lights: battery light, battery saver active, and other dashboard warnings. Electrical system shuts down entirely while driving. Battery replacement, starter replacement, and alternator replacement do not resolve the issue. Dealer diagnostics find no charging system fault.
When: Reported during heavy traffic; same issue recurred after full repair attempts at 7,800–9,000+ miles
Symptoms owners cite: Battery light illuminates; Battery Saver Active message appears; AC Hot Shut Off message; Traction Control message; Reduced Power message; Complete electrical shutdown; Vehicle will not restart without jump-start; System shuts down even after battery, starter, and alternator replacement
Repairs/costs cited: Owner replaced battery, starter, and alternator. Dealer ran diagnostic tests and charged service fee but reported no charging system fault found. Problem persists even after all major components replaced.
Radio and audio system failures
Factory radio, chime, and turn signal indicator stop functioning. Radio display goes dark and no sound output occurs. OnStar and phone functions also cease. In other cases, radio shorts out when vent controls are activated, or radio stops working after battery connection issues.
When: Reported at early ownership to higher mileage; one instance at 22k miles
Symptoms owners cite: Radio becomes non-operational; No display on radio; No sound from speakers; OnStar system fails; Phone function inoperable; Chime stops working; Turn signal tick-tick sound disappears; Radio shorts out when vent controls activated; Radio fails after battery connector tightened
Repairs/costs cited: Rear defroster wiring repair correlated with radio failure in one case. Bad battery cell required replacement in another. No systematic repair documented.
Windshield wiper fluid pump failure
The windshield washer fluid motor fails and stops dispensing fluid. Occurs after only a few months of ownership.
When: Within first few months of ownership
Symptoms owners cite: Windshield washer fluid stops dispensing; Motor fails to operate
Repairs/costs cited: Motor failure requires replacement.
TPMS (Tire Pressure Monitoring System) sensor false warnings
TPMS warning light illuminates intermittently even when tires are properly inflated and sensors are tested as functional. Same sensor repeatedly triggers warning. Dealer will not test individual sensor despite owner request.
When: Reported early in ownership; at 7,800 miles on one vehicle
Symptoms owners cite: TPMS warning light comes on intermittently; Warning light triggers even with proper tire pressure; Light goes off after a few minutes; Left rear sensor consistently triggers warning; Intermittent, recurring activation
Repairs/costs cited: Dealer recommended antenna replacement as solution but part was unavailable. Dealer refused to test individual TPMS sensor. Problem persists without resolution.
Transmission and drivetrain electrical issues
Transmission fluid leaks; transmission slips during acceleration; vehicle cannot be shifted out of Park due to solenoid failures. Transmission exhibits loss of power and jerking on acceleration.
When: Reported at 22k–62k miles
Symptoms owners cite: Transmission fluid leaks with no identified source; Vehicle hesitates and jerks upon acceleration; Transmission slips while driving on highway; Loss of power during acceleration; Cannot remove vehicle from Park; Repeated failure requiring overhaul
Repairs/costs cited: Input sprague failure due to premature wear documented. Transmission repaired at 39k miles, but required complete overhaul at 46,699 miles after 1,474 additional miles. Multiple solenoid replacements required. Shift control solenoid broke twice.
Dash light and headlight flickering
Dash lights and headlights flicker intermittently while driving. Instrument display may briefly go dark, and headlights may dim significantly, creating unsafe night-driving conditions. Identified in TSB 07-08-42-008.
When: Intermittent, reported at all speeds
Symptoms owners cite: Dash lights flicker; Headlights flicker and dim; Instrument display goes out briefly; Headlights dim to unsafe levels for night driving; Occurs at all speeds
Repairs/costs cited: Chevrolet dealer acknowledged problem and identified it in TSB 07-08-42-008. Owner notes this is a safety concern greater than an inconvenience.
Recalls/TSBs owners mention: TSB 07-08-42-008 issued; however, no formal recall or repair procedure documented.
Heating system malfunction
Heat only blows warm air during acceleration; turns ice-cold when engine is idling. Issue persists or recurs despite multiple dealer repair attempts using different approaches.
When: Recurring issue across multiple repair attempts
Symptoms owners cite: Heat blows warm only during acceleration; Heat turns ice-cold when idling; Problem recurs after dealer repair; Multiple different repair attempts by dealer
Repairs/costs cited: Dealership attempted three separate repairs, each using a different approach, but problem recurred after each. Dealer blamed owner for 'not knowing how to work heat' and suggested owner was 'breaking it,' despite issue being documented as known problem.
Door lock and locking system failures
Doors hesitate when locking or unlocking. Lock pad function fails intermittently. Automatic door lock function does not work.
When: Reported at 190k miles
Symptoms owners cite: Doors hesitate to lock; Doors hesitate to unlock; Keypad does not work
Repairs/costs cited: No repair documented. Issue occurred after recall repair service.
Cruise control and accelerator electrical faults
Cruise control activates independently without driver input. Vehicle accelerates on its own. Issues occurred after recall service.
When: Reported after recall repair at 190k miles
Symptoms owners cite: Cruise control activates independently; Vehicle accelerates without driver input; Stalling also reported concurrently
Repairs/costs cited: Occurred post-recall repair. Dealer stated failures were not related to recall repair. Cause unable to be determined. No repair performed.
Burning smell and electrical connector failures
Burning odor detected near driver's seat area or passenger compartment. Turn signal blown fuse, trunk not opening, and speaker failure occur simultaneously or in sequence with burning smell.
When: Reported at 83k miles
Symptoms owners cite: Burning odor near driver seat; Trunk will not open; Rear right turn signal blown fuse; Front speakers not working properly; Failures recur on multiple occasions
Repairs/costs cited: Not diagnosed or repaired.
Synthesized from 104 NHTSA owner complaints — unverified consumer
allegations, summarized for patterns. The verbatim filings appear below.