![]() It’s like the truck is turning off as I’m driving, but it doesn’t feel like it. “I just purchased my 2021 Blazer RS, and the dash started acting up after 3000 miles. Here is how one Chevy Blazer owner described their experience: The same issue has also been reported in 2021 models of the GMC Acadia, Chevy Camaro and Chevy Malibu. It doesn’t affect the drivability of the vehicle, but you’ll momentarily lose the speedometer, as well as other important information that’s displayed on the digital dash. This issue only occurs in the RS and Premier trim levels which have the larger digital display in the middle. Sometimes, the dash will only light back up after restarting the car. Owners report that the entire instrument cluster will intermittently turn itself off and start back up again while they’re driving. The 2021 models of the Chevrolet Blazer are more prone to instrument cluster issues than all other model years. Older GM vehicles that had similar issues did get a software update which seems to have gotten rid of the vibrations, but there are no official updates for the Blazer yet. However, this does result in slightly worse gas mileage.ĭealers who are not familiar with the issue will typically try to balance the tires or check the drivetrain and engine mounts to no avail since it’s actually caused by the cylinder deactivation. Some owners have resorted to using an aftermarket AFM disabler, which can be plugged into the OBDII port, to get rid of the annoying vibrations. Unfortunately, GM doesn’t provide any way to permanently disable the AFM system. Doesn’t seem to be as much of an issue at lower speeds.” Solution Seems to want to deactivate cylinders too much. “It almost feels like the transmission is holding the higher gear and lugging the motor because the noise disappears after a downshift.” I didn’t experience this issue in the 5K miles I have put on the Blazer up until then.” “I took my 2019 Blazer RS into the dealership for a slight shudder when cruising at 35 to 40 mph with very light throttle. Here is how a few Chevy Blazer owners describe the issue: Other GM vehicles that use the same V6 engine like the GMC Acadia and Cadillac XT5 also have similar issues. Some vehicles have this issue as soon as they leave the factory while others only exhibit it after a couple thousand miles. This is when the Active Fuel Management (AFM) deactivates 2 cylinders to save on gas and runs in V4 mode, which you can tell by a light on the dash. It usually starts at around 35 mph while the engine is running at 1,500 RPMs. ![]() It’s also often accompanied by a light chatter or flutter sound. The vibration or shuddering is similar to the feeling you get when driving over rumble strips but at a much lower intensity. This problem only occurs in the 20 models. Some Chevy Blazers equipped with the V6 engine have vibration issues while cruising at highway speeds. Some owners were also able to get rid of the error by ‘shorting’ the Park switch permanently. If the car is no longer under warranty, the part itself costs around $100. GM has issued a TSB (Technical Service Bulletin) that recommends replacing the entire shifter assembly in order to fix the faulty Park switch. This eventually activates the switch and gets rid of the error message and the accompanying electrical issues. The most common workaround to this problem is to simply press the shifter button several times and move around the shift lever a bit. The ‘Shift to Park’ error message is caused by a faulty microswitch in the shifter assembly that tells the car’s computers when the car is in Park as a safety measure. Have to move shifter several times so message will disappear.” Solution When vehicle is in Park, instrument panel says Shift to Park. I cannot turn off the car or lock the doors.” “Shift to park displays despite being in park. Here is how a few owners described the issue: It also shows up in a lot of other GM vehicles like the GMC Acadia, Chevy Malibu and Chevy Traverse. This ‘Shift to Park’ issue occurs mostly in the 2019 model years of the Blazer, and we’ve seen a few reports of it happening in the 2020 model.
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