Chevrolet Bolt EV check engine light comes on

Filed Aug 1, 2026 · Brakes, Electrical · MD

The vehicle suffers from severe, unresolvable electrical failures causing recurring loss of propulsion, shifting lockouts ("No Driving Conditions" / stuck in Park), complete exterior lighting failures, and loss of communication with the Restraints Control Module (RCM) and airbag impact sensors. The primary failure involves short circuits, open circuits, poor terminal contact, and thermal damage with melted, charred wiring and exposed copper in the main harness[cite: 6]. On May 25, 2026, OnStar telematics issued a critical red alert for the Regenerative Braking System[cite: 7]. All damaged components and diagnostic reports are available for inspection upon request[cite: 6, 7]. Safety risks include sudden loss of propulsion at highway speeds, total headlight and tail light loss during night driving, and potential non-deployment or malfunction of airbag restraint systems during a collision. The issues have been repeatedly reproduced and confirmed by an authorized dealership through 7 repair attempts between Sept 2024 and Apr 2025. Diagnostic steps included opening GM TAC Case 9-13634782861, consulting GM engineers, and testing 33 ground points. On Oct 28, 2024, the dealer and an insurance adjuster officially confirmed the failures are covered under GM warranty and unrelated to any accident[cite: 8]. Symptoms first appeared on Sept 10, 2024 (at 5,144 miles) with a "Waiting initialization to shift" message, blown Fuse 58, and loss of power to the ECM. Warning signs prior to subsequent failures included "Service Trans" warnings, "Reduced Propulsion" alerts, dim headlights, Check Engine Lights, SRS/Airbag warning lights, and total shifting lockouts after hitting road bumps. Despite replacing Fuse 58 (multiple times), Fuse 64, IP Fuse 7, the underhood fuse block, ECM connector terminals, headlamp assemblies, the RCM module, and multiple airbag impact sensors, the underlying electrical instability remains unresolved.

Filed May 8, 2026 · Electrical, Transmission · CA

Recurring electronic transmission shift control failure on a 2023 Chevrolet Bolt EV. The Electronic Transmission Shift Control Pushbutton Circuit Board (GM part designation K212) has failed twice within approximately 9,300 miles. First failure occurred at approximately 45,695 miles in July 2025. The dashboard displayed a malfunction indicator and a "Service Transmission" warning. Diagnostic trouble code U18D2 was set: Lost Communication with Transmission Range Selector Control Module on the Powertrain Sensor CAN Bus. The selling Chevrolet dealer replaced the K212 pushbutton circuit board and reprogrammed the HPCM2 module. Second failure occurred at approximately 54,969 miles in March 2026, only about 9,300 miles after the first repair. Same diagnostic code family, including the identical U18D2 code, plus U0076, U18C6, and U240E. The same dealer replaced the same K212 pushbutton circuit board a second time. The repair was processed under manufacturer warranty. Safety risk: when the failure occurs, communication with the transmission range selector is lost intermittently and without warning, leaving the vehicle unable to be reliably shifted into Drive, Reverse, or Park. This creates a clear hazard in traffic, parking lots, and on inclines. The failure mode is sudden and the warning lamps appear only after the malfunction has begun. The component is located beneath the center cup holder area. There is no visible waterproofing or moisture isolation around the circuit board, despite its location directly under a known liquid exposure zone. The failed component from the second repair was reportedly shipped back to GM by the dealer. The vehicle is available for inspection. The failure has been confirmed twice by an authorized Chevrolet dealer.

Filed May 28, 2025 · Fuel system · 25,100 miles · IN

The contact owns a 2020 Chevrolet Bolt EV. The contact stated that upon starting the vehicle, the message "Propulsion Power Reduced - Service Soon" was displayed, and check engine warning light was illuminated. The contact stated that upon investigation, it was discovered that the power output was limited. Despite the failure, the contact was able to drive the vehicle to the dealer. The contact was informed that the battery needed to be replaced. The contact was then informed that the battery replacement was on an indefinite backorder. The contact was not provided an estimate for when the battery would become available. The manufacturer was not notified of the failure. The vehicle was not repaired. The failure mileage was 25,100.

Filed Jan 20, 2025 · Electrical, Fuel system · CA

The vehicle was driving and lost all power and came to a stop. After about 5 seconds vehicle regained power. The "check engine light" illuminated on the dash. took to dealer and stated could not replicate problem. Only have the report from vehicle computer and the EV technician did not understand the information and had to call GM for help. Got car back and problem happen again. Dealer had GM specialist out to help. GM reset computer and problem just happens again.

Filed Aug 27, 2024 · Electrical · 25,000 miles · IL

The contact owns a 2020 Chevrolet Bolt EV. The contact stated while driving approximately 4 MPH and exiting the driveway, the check engine warning light and the check gear shifter warning light was illuminated. The contact stated that the vehicle stalled. The contact was unable to restart the vehicle. The contact had the vehicle towed to a local dealer, where it was diagnosed, and the dealer was unable to duplicate the failure. The vehicle was not repaired. The contact stated that the failure reoccurred. The contact was able to drive the vehicle to the same dealer who diagnosed the vehicle and determined that the negative 12V battery cable had short circuited and needed to be replaced. The vehicle was repaired. The manufacturer was informed of the failure. The failure mileage was approximately 25,000.

Filed May 5, 2024 · Electrical, Fuel system · AZ

The engine compartment wiring harness Part Number: 42765196 wiring shorted out due to the chaffing of wires in the harness. The dealer is replacing the harness but there is no known changes that will prevent this in the future. $3,000 repair bill. I have asked for the defective harness to be returned to me for examination. This is a major safety concern as in my case, the Chevrolet Bolt would not move either in forward or reverse (Note: the other electrical systems and battery continue to work. This failure happen in rush hour traffic and the vehicle was nearly hit by passing cars. There was no warning that the propulsion would entirely shut down. The dealer reported that they had seen this problem before. No one from the manufacturer are interested in this. A check engine light had come on the night before and I had set up an appointment with the dealer for the next day and add reported the vehicles' issues that I had observed. There is no warning to indicate that the problem would result in the complete loss of propulsion. Â

Filed Dec 2, 2022 · Electrical, Fuel system · CA

I'm experiencing the loss of propulsion covered in this bulletin. It's happened around 5 times. The malfunction indicator lamp comes on after each incident and then clears. The problem has been confirmed by a dealer and they are refusing to repair it under either the power train or emission control systems warranty. Losing propulsion is a safety issue, particularly in high speed traffic, and it needs to be fixed.

Filed Jul 28, 2022 · Fuel system · TX

As I drove my brand new 2022 Bolt (in use 30 days) into garage, the dash check engine light came on with a notice "reduced power propulsion." The battery was at about 50%. I tried to charge it and the dash indicated "charge complete." The reduced power propulsion message is concerningly similar to the error from the previous Bolt recalls that have resulted in fires. I took the car to my dealer and they have had it for 40 days and counting and say they don't know when it will be fixed nor do they know yet how to fix it.

Filed Sep 4, 2021 · Fuel system, Transmission · CA

The check engine light came on in my vehicle and limited the speed at which I could drive resulting in the car dealership is refusing to honor the warranty on my vehicle. The manual and all information from General Motors explicitly states the components which are covered under warranty. There is a the federal safety agency service bulletin regarding this exact problem (the federal safety agency 18-NA-064) along with the labor code for doing repairs under warranty. The warranty is for the first 100,000 miles or 8 years (2025), my vehicle currently has 49906 miles. The reason I was given is that software is not usually covered under warranty but there is no documentation stating that is the case. I was told that this vehicle may have this problem just due to operating it and there is no recourse for me other than to pay to have it fixed. If this is true the vehicle is unsafe to be driven in traffic.

Filed Aug 30, 2021 · Fuel system · CA

Recently going from cali to az and back i had 7 check engine lights while charging but onstar said nothing is wrong. Also it happened while running at still while running the AC. This is very dangerous and I refuse to drive my bolt and will payout of pocket for a rental and seek reimbursement. Anyways Ive been trying to send these videos to engineering/you. Here is 4 videos Electrify america check engine https://youtube.com/shorts/15J8QhNRPRc?feature=share Evgo with onstar. In california evgo https://youtu.be/YH_3M5JMiAM Electrify america. California. https://youtu.be/xzOs_-E8FHg Evgo AZ https://youtube.com/shorts/Zf61arcN8Z0?feature=share