I have had this vehicle at the garage for the 4th time in 2 months for the same issues. It would not start. the fuse box keeps blowing. The starter was replaced and the Alternator was replaced and the fuse box 3 times so far. It is in the auto repair shop now for the same issues. the mechanic has done an inspection and diagnostics and cant find what is wrong. There were no warning lights to warn…
2021 Chevrolet Trailblazer electrical problems
severe 30 complaints filed with NHTSA · avg repair $850 · see electrical across all vehicles →
Complaints
30
Recalls
0
Avg fix
$850
1crash
1fire
What stands out
Owners have filed 30 electrical 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.
The failure pattern owners describe
Buyer takeaway: The 2021 Trailblazer has widespread electrical issues including a notorious "Shift to Park" sensor fault that prevents engine shutdown, water leaks destroying infotainment and critical electronics, and engine stalling from broken wiring at the air intake sensor. Before buying one used, have a pre-purchase inspection focus on transmission shift response, electrical module health, and evidence of water damage or corrosion—many owners have spent thousands on repairs that GM refuses to cover despite known design bulletins."
Owners of 2021 Chevrolet Trailblazers report a range of electrical failures that span drivetrain control, infotainment, body electronics, and power distribution. The most frequent complaint involves a "Shift to Park" error message appearing even when the vehicle is already in park, preventing the engine from shutting down. Owners describe having to repeatedly jiggle the shifter, restart the vehicle, or drive around the lot before the car recognizes park mode. GM issued TSB PIT5616A to address this, but parts remain backordered with long lead times; some dealers have suggested customers trade in vehicles rather than wait for repair parts.
Separate failures include engine stalling due to broken wires at the mass airflow sensor (confirmed via GM Service Bulletin 22-NA-008), total electrical blackouts affecting all dashboard electronics simultaneously, and water intrusion leading to electrical damage—one owner reported a flooded interior that rained moisture into the cabin for two years before discovery. Radio and speaker problems appear in multiple accounts: crackling, popping, and buzzing sounds; complete audio loss; and loss of backup camera and warning signals tied to a "shortage in radio" module. Other reported issues include power steering and brake failures at low mileage, door locks that malfunction or fail to recognize the key fob, ignition keys that become stuck and won't turn off, and an alternator and fuse box that repeatedly fail, draining batteries and leaving vehicles inoperable. One owner reports a post-collision fire.
Same Chevrolet Trailblazer electrical reports on nearby years: 2022 · 2023
Failure modes owners describe
Shift to Park sensor/shifter harness malfunction
Vehicle displays 'Shift to Park' error message even when transmission is already in park, preventing engine shutdown and trapping occupants in the vehicle. Requires repeated shifter manipulation or restarts to register park mode.
When: Throughout ownership; one owner reported issue started around 50,000 miles
Symptoms owners cite: Cannot turn off engine; Shift to Park warning persists in park mode; Radio and other systems remain active; Dinging alarm; Car may not recognize actual gear position while driving
Codes mentioned: Transmission control module fault mentioned in one narrative
Repairs/costs cited: TSB PIT5616A issued by GM; requires shifter harness replacement; parts on backorder with six-month+ lead times reported; some dealers suggest trading in vehicle
Recalls/TSBs owners mention: TSB PIT5616A exists; class action lawsuit filed; GM offered trade-in instead of repair wait
Mass airflow sensor wiring failure
Broken wires at the mass airflow sensor cause engine stalling and reduced power warnings. GM Service Bulletin 22-NA-008 (March 2022) documents the issue. Owners report the design does not account for engine rocking and movement.
When: Owner reported failure at late August 2025; one narrative mentions issue within two years of ownership
Symptoms owners cite: Engine stalls while driving; Yellow check engine light; Engine Power is Reduced message; Random stalling in traffic
Codes mentioned: U060F (Mass Air Flow Sensor)
Repairs/costs cited: $364.44 repair cost reported; required inspection and wire repair at independent shop
Recalls/TSBs owners mention: GM Service Bulletin 22-NA-008 issued March 2022; GM declined warranty coverage; classified as customer responsibility despite known design issue
Electrical system voltage and module failures
Vehicle experiences low system voltage, repeated power module resets, and lost communication with critical control modules including the airbag system. Multiple electrical components fail simultaneously.
When: Early in ownership reported in some narratives; one owner reports 1,574 miles
Symptoms owners cite: All electronics go blank or dead; Check engine light and reduced power message; Power steering and brake failure; Abnormal popping sound before failure; Brake pedal becomes overly sensitive
Codes mentioned: P0562 (System Voltage Low), P1005 (Fuel Level Sensor Control Module: Too Many Resets), P14C0/P14CD (Fuel Pump Driver Control Module Signal Error), U0151 (Lost Communication with Airbag Control Module/SRS)
Repairs/costs cited: One owner spent $4,500+ on alternator, starter, and fuse box replacements (three times) without resolution; fuse box kept blowing
Recalls/TSBs owners mention: Dealers unable to duplicate failures; one dealership reprogrammed power steering angle sensor and rear differential clutch sensor without success; Lemon Law case being processed
Water intrusion and electrical damage from leaks
Vehicle develops water leaks under the driver's seat and in the trunk, leading to moisture damage of interior electronics. Owners report mildew smell, wet carpeting, and cascading electrical failures.
When: One owner reported leaking for two years; another noticed water in trunk and found flooded interior
Symptoms owners cite: All electronics go blank/dead intermittently; Mildew smell in cabin; Liquid detection warning when charging phone; Radio crackling and squealing then complete failure; Backup camera failure; Interior fabric compromised
Repairs/costs cited: Owners took vehicles to dealership for 'water test' with no confidence in resolution; damage to radio module, infotainment system, and charging port reported
Radio and speaker failures
Radio module experiences intermittent or complete failure, loss of audio, crackling and popping sounds from speakers, and loss of integrated functions including backup camera alerts and turn signal feedback. One diagnostic noted 'shortage in radio' module.
When: Narratives report issues within first year of ownership; one case cited 43,906 miles with purge pump replacement; another reported October 2022 (purchased September 2020)
Symptoms owners cite: Loud crackling or popping from speakers; Loud buzzing noise (uncontrollable by volume); Black screen on infotainment display; No backup camera display or beeping; No radio sound; CarPlay disconnects and glitches; No sound from turn signals or hazard lights; Noise frightening drivers; Loss of front USB charger power
Repairs/costs cited: Dealers unable to replicate some failures; one case noted 'shortage in radio' diagnostic but repair status unclear
Door lock and keyless entry system failures
Door locks malfunction, fail to unlock, or do not respond to key fob commands. Occupants become trapped in or locked out of vehicles. Some owners report keyless entry button requires excessive pressure to function.
When: Reported throughout ownership; one owner trapped outside at night; another reports key fails to unlock 80% of the time
Symptoms owners cite: Doors will not unlock; Key fob not recognized by vehicle; Vehicle shows 'no remote detected' error; Keyless ignition button requires excessive pressure; Key gets locked inside vehicle; Occupants trapped inside or outside
Engine stall and transmission shift failures
Vehicle cuts off while driving or fails to shift into required gears. Engine stalls unexpectedly; transmission fails to engage drive or properly transition between gears, requiring repeated gear shifting attempts.
When: Reported at various mileages; one owner at 50,000 miles noted transmission control module code
Symptoms owners cite: Engine cuts off while driving; Vehicle will not shift into drive; Rough or delayed gear engagement; Close calls with other traffic due to inability to accelerate; Repeated attempts required to engage gears; Transmission control module fault code
Codes mentioned: Transmission control module
Repairs/costs cited: One owner reports high stress on battery due to improper shifting; transmission replacement may be required for some vehicles, though GM initially offers only shifter harness replacement
Brake and power steering intermittent failures
Power steering and brakes fail simultaneously or independently, creating unsafe conditions. Brake pedal becomes overly sensitive, causing abrupt stops. One narrative reports brake grinding and squeaking from new vehicle.
When: One case at 1,574 miles; another at various speeds during normal driving
Symptoms owners cite: Power steering fails; Brakes fail; Brake pedal overly sensitive causing abrupt stops; Grinding noise from brakes; Squeaky brakes on new vehicle; Abnormal popping sound preceding failure; System failure intermittent and not reproducible at dealer
Repairs/costs cited: Dealer unable to duplicate failures; dealership reprogrammed rear differential clutch sensor without success
Purge pump and fuel system control failures
Purge pump fails under warranty at low mileage. Fuel level sensor module experiences repeated resets; fuel pump driver control module reports signal errors.
When: One case at 43,906 miles while under warranty
Symptoms owners cite: Check engine light; Fuel gauge inaccurate or unstable; Fuel delivery issues; Starting problems; Engine stalling
Codes mentioned: P1005 (Fuel Level Sensor Control Module: Too Many Resets), P14C0/P14CD (Fuel Pump Driver Control Module Signal Error)
Repairs/costs cited: Purge pump replaced under warranty
Auto-stop and software malfunction
Auto-stop function fails to operate properly. Dealer reports issue is weather-related or unprogrammed, reprograms software, but failure recurs. Vehicle also experiences tire pressure sensor fault.
When: Reported at approximately 5,000 miles
Symptoms owners cite: Auto-stop not functioning; Check engine light; Reduced power message; Tire pressure sensor fault; Software resets after reprogramming
Repairs/costs cited: Dealer reprogrammed AUTO-STOP software and tire pressure sensor; failure recurred
Ignition and key stuck in ignition
Ignition key becomes stuck and cannot be removed from the ignition cylinder. Requires restarting vehicle, shifting to drive, wiggling steering wheel, and repeated attempts to extract key.
When: Ongoing issue; takes 5-10 minutes to remove key at times
Symptoms owners cite: Key will not remove from ignition; Requires engine restart to free key; Requires shifting and steering wheel manipulation
Climate control malfunction
HVAC system fails to deliver adequate airflow through floor vents when floor option is selected. Requires switching to face vents to achieve heating or cooling.
Symptoms owners cite: No or minimal airflow from floor vents; Climate control function degraded; Unable to use floor vent setting effectively
Headlight and security system intermittent faults
Headlights flash on and off on their own. Security system cuts off intermittently. Brake function becomes erratic.
Symptoms owners cite: Headlights flash autonomously; Security system deactivates; Brake function inconsistent
Post-collision fire
Vehicle fire occurred approximately five minutes after a three-car collision, with smoke and flames fully engulfing the vehicle.
When: Post-collision
Symptoms owners cite: Engine smoking; Vehicle fire; Complete vehicle engulfment
Synthesized from 30 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 8 most recent
After trying to remove rhe key from ignition, it gets stuck and won't come out unless I turn the car on, shift it into drive, wiggle the steering wheel, and try it again. Sometimes it works. Alot of times it take 5-10 min to get it out.
Popping sound from passenger side front speakers when releasing the brake pedal after a stop. Vehicle in drive.
2021 Chevy Trailblazer When I go to park my car, there is a constant error of 'Shift to Park'. The car is already in park. I must wiggle the shifting knob, restart my car, or drive around before my car will turn off and recognize that it is in park. My safety is compromised each time I get in the car. If the car cannot recognize it is in park, what happens when it can't recognize it is in…
While driving the car will cut off and on real quick. The headlights will flash on their own. Security systems cuts off and the brakes function messes up.
"Shortage in radio" according to Chevrolet's diagnostic. Caused black screen, no back up camera, no beeping when in reverse and coming close to another object, no sound when blinkers or hazard lights are on, no radio, no power to front charger, no ability to use front auxiliary cable. Initially a loud buzzing noise which could not be controlled by the volume dial. Problems began on or around…
When I place my car in park, a "shift to park" message appears on the dashboard. I am unable to fully turn my car off and the car will ding at me. I have tried driving around the parking lot, pushing the shifter from side to side and into another gear then park again, going forward and backward, but the problem still exists. It started to occur more frequently, until it occurred every time I…
The issue is the yellow engine light lit up on the dash of my 2021 Trailblazer in late August of 2025. At the same time, the cluster displayed the message "Engine Power is Reduced". Over the next few weeks my car engine would randomly stall out while I was driving! As you can imagine, this is a very unsafe driving condition. My car stalls and I'm in traffic and have no ability at all to…
Had electrical trouble with your 2021 Chevrolet Trailblazer?
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 electrical problem on the 2021 Chevrolet Trailblazer?
It's a meaningful issue. 30 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $850.
At what mileage does the electrical typically fail?
Based on the 30 complaints filed, electrical issues most often appear around 3,287 miles. Some report problems earlier; some make it well past 150,000 with no symptoms. Maintenance habits matter — vehicles that received timely fluid services and were not regularly overworked tend to last longer.
What does it cost to fix?
Independent shops typically charge around $850 for electrical 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 electrical?
No active recalls currently cover electrical 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/2021/Chevrolet/Trailblazer.
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.