Electrical System Problems of Chevrolet Trailblazer - part 1

The incident involved a 2025 Chevrolet Trailblazer, purchased new in late February 2025. The failure appears related to the vehicle’s electrical/charging system and associated control modules, resulting in a sudden loss of critical safety systems. The vehicle was towed by gm roadside assistance and is currently at an authorized Chevrolet dealership, where it is available for inspection upon request. While driving in cambria, new york, the dashboard illuminated with multiple warning indicators and the vehicle experienced a complete loss of power steering and braking. The brake pedal traveled fully to the floor with no resistance and no braking effect. Steering effort increased dramatically. The driver was only able to avoid a crash due to favorable road and traffic conditions and was able to coast to a stop and pull off the roadway. This failure posed an immediate and serious risk of injury or death to the driver and others. The problem had occurred previously in the form of repeated warning messages. Beginning within the first week of ownership, the vehicle displayed “service the charge system vehicle may stall” warnings and since then has appeared hundreds of times. The vehicle was previously towed to an authorized Chevrolet dealership, where we were informed that general motors identified the issue as a known software-related problem and advised that the vehicle could continue to be driven while awaiting a future update. The catastrophic failure occurred after this guidance. The vehicle has been inspected by an authorized Chevrolet dealership both prior to and following this incident, and general motors has been involved through dealership communication. No police or insurance inspection has occurred, as no collision resulted. Based on the repeated warnings, dealer statements, and nature of the failure, the best assessment is an electrical or software-related malfunction, though the precise root cause remains unknown and requires investigation.

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When parking and trying to shutoff vehicle a warning stating that the car needs to be shifted into park needs to be performed even though it is already properly in the parked position. The car cannot be shutoff and remains running until several actions of shifting the car in and out of the park position.

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The vehicle intermittently warns about a power steering issue with no other indications to the problem. There are no physical issues detected while driving. The error displays at random times and will reset intermittently. This started occurring at the same time the car constantly indicates that it is not in park when trying to shutoff the vehicle even though it is clearly shifted into park.

Shift to park message when car is in park - cannot turn off vehicle until message goes away. Car can roll if message is not off. Brakes: intense squeaking.

The vehicle displayed a warning on the dash that the battery was not charging properly and vehicle may stall. The vehicle was checked at dealership and issue was disregarded. 3 days later the vehicle showed the same warning and the battery light flickered, there was a chane in the power and lights dimmed. This was evaluated by dealership, apparently it is a known issue but no resolution available. When the battery light flashed during the second event there was no control over the vehicle (power/steering) creating a very concerning safety issue.

1/ while at the stop site, the car suddenly stopped and went black. Stereo turn off and screen went black. 2/ sometime I can’t unlock the car from inside. The lock works but not the unlock button. While backing or stopping there is a high noise that seems like I have a bad brake , took it to the dealership and they said the brake is good but they can’t figure out where the noise coming from. I took the car to the dealership 3 times in 1 month since the problem started and they still can not fix it.

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The radio system working with the phone produces a high pitch static noise when trying to make a phone call or when receiving a phone call. This has been reported to the dealership. Mechanics say that Chevrolet does not android phones, only iphones and this is causing the problem with the radio system, the lights will go on and off at a moment's notice whether you're driving when you're driving radio plays when it wants to play like I said you can't receive or make phone calls in this car, you have to be outside of the car with the car switched off in order to make a phone call, driving down the road in the middle of the night the lights could just go out sometimes for a whole 10 minutes before they come on again, radio does the same thing in and out in and out at anytime, it does not care is there a fix for these problems. Dealership did not note this problem said it was not a fix and phone needed to be changed, so there is no documentation of the incidence as they happen. Dealership refused to do the paperwork refused to check, it said it was normal because of that android phone. Chevy does not support an android phone on their vehicles.

While driving, a service warning came on that reads "service power steering" - when that came on, the brakes ceased to work properly and required significant force, causing a big delay in braking. It is not safe to drive due to the limited braking. This mirrors the recall situation for other 2021 Trailblazer models with the interrupted brake sensor.

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When I shift my vehicle into park and hit the button to shut it off, a "shift to park" message appears on the dic screen. I then am required to start my vehicle again, shift into gear, and then put it back into park and attempt to shut the vehicle off again. It has taken me up to 15 minutes to be able to get it to recognize that my vehicle is in park and for the message to not pop up. If I get out of the car while the message is still on the dic screen, I cannot lock my vehicle and it drains the battery. I contacted my local Chevrolet dealer and they are saying that although this is a known issue which has had more than one gm service bulletin on this issue which includes my year and model, there is not an actual recall for this, so I have to pay out of pocket, because my bumper to bumper warranty expired at 36,000 miles and I am currently just shy of 39,000 miles. Of note, there is also a class action lawsuit for this exact issue so I am confused as to why a recall would not have been issued, or why it would not still be covered despite the expired bumper to bumper warranty.

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 control the vehicle. This happened at least 4 times to me. When I checked the on board diagnostic codes on my vehicle the system reported back u060f (mass air flow sensor). I searched online for this condition with 2021 Trailblazers and found gm service bulletin number 22-na-008, dated March of 2022. This service bulletin clearly shows that Chevrolet were well aware of a problem years before it occurred to my vehicle. So, in October I took my car to bowman auto center, explained all of the above to them, and I mentioned the service bulletin that I found. Their investigation found that, indeed, the cause of my engine stalling was broken wires to the mass air flow sensor (maf sensor). Bowman repaired my car and billed me $364. 44 as shown on the attached 2-page repair order. I tried to make the case with the bowman service department that this should be a warranty repair, and paid by gm. Bowman responded that it was only a service bulletin from gm for the issue, and the customer is responsible for payment. I am astonished that repair of this product design failure, which results in an unsafe driving condition, would be paid for by the customer! the reason I call it a design failure is because no wiring should break during the life of a vehicle. Engines rock and move, and the Trailblazer design should have compensated for this engine movement by having a sufficient slack loop designed into the wire harness leading to the mass air flow sensor. I filed a case with Chevrolet, number 80982656, but they declined my request for reimbursement $$.

My vehicle displayed a shift to park message even though I was already in park. I could not turn off the engine, I could not lock my car. I had to go back into drive and then park mode and wiggle the shifter multiple times to get it to recognize park and turn off the car. This is now happening almost every time I drive the car. I did an internet search to see how to rectify the problem only to find that this exact issue has plagued gm vehicles for a decade and they still have not chosen to rectify the faulty part. There have been multiple recalls and class action lawsuits for the shift to park fault but not for my vehicle year yet! there are many Trailblazer owners who are experiencing this exact issue (on online forums) and gm so far is refusing to take responsibility and issue a recall to fix the issue for owners and also to stop using this faulty system in their cars. I have reached out to gm about this multiple times the past few weeks and requested they pay for diagnostic and fix the problem because it is a common and known problem with gm vehicles but they want me to pay for it myself and the repair and then they may decide to help out - unacceptable in my opinion. To be honest there needs to be a recall now and gm needs to be forced to change the components in all new models to stop this happening in future models going forward. This problem can cause the car battery to drain, it can cause the vehicle to roll away if it’s not recognizing it’s in park. Thankfully that hasn’t happened to me but others have had this happen. Not being able to shut the engine off or lock my car is a problem. This is a safety issue that needs addressing. I have lots of messages and communication from general motors which I have attempted to attach the screenshots with the photo below but get an error message on the upload page.

I get a shift to park warning after putting the car into park. I’m not able to turn the car off, this has drained the battery and caused safety issues for me and my child.

My 2024 Chevrolet Trailblazer has two main issues. First, there is a constant squealing noise when braking. I reported this twice to the dealer — the first time they said it was just sand inside the wheel. The noise continued. On the second visit, they told me it would cost over $100 to inspect the brakes because the wheel needed to be removed, which I couldn’t afford. This problem started before the vehicle reached 36,000 miles. Second, the electrical system malfunctions occasionally while driving. When I connect my son’s phone to bluetooth, both the dashboard and infotainment screens shut off completely for a few seconds. This happens while the vehicle is in motion, and it is extremely dangerous, especially on highways. The screens then turn back on. I believe both issues may relate to safety and should be investigated.

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Vehicle diagnostic summary – trouble codes explained 1. P0562 – system voltage low the vehicle’s electrical system is running at low voltage. This could be due to a weak battery, a failing alternator, or poor electrical connections. It may cause various electronic issues and unexpected shutdowns if not fixed. 2. P1005 – fuel level sensor control module: too many resets the fuel level sensor module has been reset too many times, likely due to electrical glitches. This may cause the fuel gauge to be inaccurate or unstable. 3. P14c0 / p14cd – fuel pump driver control module signal error there is a configuration signal error from the fuel pump control module. This could lead to fuel delivery problems, starting issues, or engine stalling if it worsens. 4. U0151 – lost communication with airbag control module (srs) the system lost contact with the airbag diagnostic module. This may affect airbag deployment during a crash, making it a serious safety concern.

There is a faulty sensor on this car that does not allow the car to be properly parked and gives the error message "shift to park" on the dashboard. You have to turn the car back on and mess with the shifter multiple times to get it to register that it is park. This usually takes about 10 attempts every time you need to park the car. There are other reports regarding this exact issue on this car that further validates that this issue is relevant and needs to be addressed through a recall.

Put vehicle into park, attempt to turn off car, get message shift to park after the vehicle is already in park. Vehicle keeps message shift to park not allowing car to fully turn off even though car is not started it keeps flashing message shift to park and system such as radio will not turn off as the car thinks it's not in park even though it already is.

The dash and radio have gone out while driving several times now. Was driving out of state on vacation and it has gone out on us over 9 times. We will be driving and the dash goes black. You can’t see your speed, gas or radio.

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.

The vehicle began to display 'shift to park' on the display even after the vehicle was in the park position. This started periodically over a few days, but then became a regular occurrence within a week. At first this could be resolved by shifting back out of park and back into park, but that became less effective as time went on. The vehicle will not shutdown fully when this warning is displayed and therefore can cause a battery drain condition, which can result in a safety risk returning to a vehicle with a weak or dead battery. This occurred at 37 months of ownership with ~28,100 miles on the vehicle. In researching to understand the problem, I discovered that there are many instances of this same issue occurring at about the same time period, as well as there being several class action lawsuits on the identical issue, which shows that it isn't isolated. Further, the cost of this repair is a replacement of the shifter assembly at nearly $700 on a $24,000 vehicle less than 3 years old, because the failed inexpensive switch isn't repairable. Repair information is available, but the system isn't allowing for an upload of the files.

There is something wrong with the battery charging system, this is a known issue for gm. I've brought it to the dealership to address the issue and they do not know what is wrong or how to fix it. Sixteen times since I got this vehicle it has flashed a warning "service charging system: your vehicle may stall because the battery is not charging properly. Schedule service soon. " I obtained this vehicle April 30th with 5 miles on it. They still do not have a fix for this, the dealership stated they would contact me when there is a recall. . . .

While driving the car stalled and eventually stopped running. The battery was still on, but there was no power to the engine. The car needed to be pushed out of the road and towed to the dealership for work.

I am reporting a recurring “shift to park” malfunction with my 2022 Chevrolet Trailblazer. When I shift the vehicle into park and attempt to turn it off, the dashboard displays a “shift to park” message, and the vehicle remains in accessory mode rather than shutting down completely. The vehicle continues drawing electrical power and the battery drains overnight. This condition poses several serious safety risks: 1. The vehicle may not consistently detect or hold the park position, creating a potential roll-away hazard. 2. It prevents the driver from shutting off or locking the vehicle, leading to security and electrical safety concerns. 3. If the vehicle remains powered in an enclosed area, it increases the risk of carbon-monoxide exposure. I understand this issue has been widely reported by owners of late-model gm vehicles, and appears related to a defective park/position switch or shifter assembly. I request a thorough investigation, appropriate repair, and confirmation whether this defect falls under a service bulletin or recall.

The cruise control system intermittently fails to engage indicating an error with the system. After several random occasions it was finally determined that the issue is related to the brake pedal sensor not determining that the brake pedal has been fully released. It requires having to manually pull the brake pedal up to properly set the sensor to allow the cruise control system to engage. This does not present any clear danger in itself, however, after having the vehicle inspected the manufacturer service center states that the entire pedal assembly has to be replaced because of worn parts and that the pedal may continue to get worse. While the mileage has taken the vehicle out of warranty that covers this issue the car is primarily driven on the interstate with minimal wear and tear on the pedal assembly.

My vehicle keeps flashing: "shift to park" when I am in park and then my car is unable to shut off the battery even though I'm in park and our of the vehicle.

Blank instrument panel while [xxx] is driving. This is not safe for my son. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

The vehicle was started with the key fob. The vehicle was then driven for 12 miles without a key within the vehicle. I had to bring the key to where the vehicle was located to lock the car and be able to drive it. This has not been inspected.

The contact's wife owns a 2022 Chevrolet Trailblazer. The contact stated that the front driver's side and passenger's side doors failed to lock as needed while pressing the lock button on the key fob or the lock button located on the exterior of the doors. Additionally, the contact stated that upon parking and attempting to turn off the vehicle, the message "shift lever to park" was displayed. The contact stated that after shifting out of park(p) and shifting back to park(p) several times, the vehicle responded as needed. The vehicle was taken to the dealer, where an unknown diagnosis was made. The dealer informed the contact that the vehicle would be repaired at the contact's expense because the warranty had expired. The vehicle was not repaired. The manufacturer was notified of the failure and referred the contact to the NHTSA hotline for assistance. The failure mileage was approximately 45,000.

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.

I am writing to formally express my frustration and disappointment regarding ongoing issues with my vehicle, which I purchased new on [xxx]. Despite repeated efforts to address these concerns with authorized dealers, I have been unable to achieve a resolution. My vehicle currently has 13,630 miles and remains under warranty. However, I feel my concerns are not being taken seriously, and the vehicle's persistent issues are being overlooked or dismissed. Background of the issue: for over a month, I have been reporting significant electrical problems and other malfunctions with my vehicle. Each authorized dealer I approached assured me that nothing was wrong. To verify these claims, I sought a third-party diagnostic evaluation, which revealed two specific error codes—clear evidence of underlying issues. Details of dealer appointments: appointment: November 25-26, 2024 I entrusted my vehicle to [dealer name], where it was kept for two days. Despite this, no diagnostic efforts or repairs were conducted, as confirmed by the service advisor, erica jones. Frustrated by the lack of action, I retrieved my vehicle on November 26, 2024. Second appointment: December 2, 2024: I scheduled another appointment with the same dealer and dropped off my vehicle on December 1, 2024. To my dismay, the paperwork I received at the conclusion of this visit contained several discrepancies: the entry date was listed as November 25, 2024, with a promised completion date of December 2, 2024. This is incorrect, as I had my vehicle from November 26 to December 1, 2024. The mileage recorded at drop-off was less than the actual mileage on the vehicle at that time. The report stated that only one mile was driven during the diagnostic process, which is insufficient for evaluating my concerns thoroughly. Issues reported: I have consistently reported the following problems with my vehicle: seatbelt malfunction: the seatbelts fail to secure me during sudden braking situations,etc. . . Information redacted pursuant to the freedom of information act (foi.

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 me of anything. I have spent 4500+ so far in repairs and more to come.

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 drove the car. I'm not sure if the car is actually in park, so when I finally get it to turn off, I place the emergency brake on. I can not physically turn the car off when this message appears on the dashboard. I took the vehicle to the service center of the dealer on 11/12/2024. I was told this has been a big problem with gm cars and they have had many cars coming in with the same problem. Currently the part is on backorder, and there is not an eta as to when it will be available due to high demand for this part.

On [xxx] I shifted my 2021 chevy Trailblazer to park and and was unable to shut off the vehicle. When I shifted it to park it kept displaying an error "shift to park" on the dashboard, but the shifter knob was correctly in park. I attempted to press the power button to turn off the car and it wouldnt do anything but beep. I tried multiple times to shift to park to get the car to recognize it was actually in park and turn off the vehicle but I was unable to do so. I was frantic and panicked to find I could not turn off my vehicle as I park on a apartment complex lot. That day I took the car to henna Chevrolet in austin TX for repair. They said the part was on backorder from gm with no eta. It is now November 1st and there is still no eta on when I will get the part for my car from gm. This has been going on for 3 weeks now with no end. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

My daughter was stopped at a stoplight and the auto-stop engaged. The light turned green and she began to accelerate when all of the error lights on the dash lit up, then the dash info system and infotainment system went out followed by the engine turning off and not restarting. While all of this happened, the vehicle behind me struck my daughter’s car. Luckily it was at a low rate of speed and no one was injured. I took the car to the dealer and after nearly a week of testing they found nothing wrong and found no error codes in the system. They ere not able to replicate the problem. However, once we got the vehicle back a similar instance happed again, except just the dash info system and infotainment system went out and the car was still drivable. Once restarted the electronics came back on as normal. It has not happened again at this point. Had the first incident happened at a higher rate of speed a severe injury or fatality could have occurred.

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 drive as I am on the road? or reverse? or any gear? my safety is also affected because my car does not realize it is in park, and at times I cannot exit my car. I am highly concerned that the car does not truly know which gear it is in and it compromises not only my safety, but the safety of my family/other passengers, and other drivers on the road. The problem is a known problem and there is an active fix bulletin for the problem. Gm cannot get the part in stock - it has been 5 weeks. It affects not only my year, make, and model, but many others too. Gm continues to sell the cars with this known safety defect. This defect has been confirmed by the dealership, and gm has sent out a known fix for the issue (TSB pit5616a). There is also a class action lawsuit for this specific issue with gm. Gm's solution to me is to trade in my car for a newer model rather than waiting for the part. In addition, many cars of my year, make, and model require a whole new transmission, but gm will only replace the shifter harness to start with, if and when they receive the part. I was told that the part could take up to six months to receive. For an issue that has been happening since at least 2019, this is unacceptable. The only warning that I receive is when I am trying to shut off my car and it will not shut off due to this error. This has been happening to my car for 2 months, but there seems to be a history of this defect since at least 2019.

I was driving my 1 week old vehicle, on a city street, foot still on the gas, and the vehicle completely shut down; no power at all. It wasn't the auto start/stop technology, but rather a complete power down. No lights, no hazard lights, no dash, nothing worked. The car came to an abrupt stop. The gear shift could not be moved into neutral, nothing. Luckily I was on a city street with not a lot of traffic. If I had been on a highway it could have caused a serious accident; if I had been driving across railroad tracks and it stops - very dangerous. I was able to contact aaa, and after a "jump", it started. However, because of my proximity to the highway, I opted to have it towed to the dealer where I bought it. . . . They ran service on it and can find nothing wrong with it. . . As you can imagine, I am nervous to drive on the highway (which I do 5 days a week normally). . .