Truck stuck in service mode

[htex88]

My 21 Silverado 1500 is stuck in the shop after getting the rear brake pads and rear right side rotor replaced. They used a fancy scanner to put it in service mode but now the truck won’t come out of it. They tried disconnecting the battery, having the dealership reflash the module, and some other online tricks. It was explained to me, that supposedly, the piston or something retracted too far and got stuck? I managed to hook my scanner up to it when I went to get my things out of the truck and got these codes P0602-00, C15C7-00, C2A1C-00, and C2A1B-00. They said it might need a new module, but they wont be able to get one for a while because they are on national back order. 
So has anyone run into this problem after replacing the rear brakes? Were you able to get it fixed? Also is the shop liable for replacing the module?

[GMCustomerService]

On 7/13/2025 at 11:29 AM, htex88 said:

My 21 Silverado 1500 is stuck in the shop after getting the rear brake pads and rear right side rotor replaced. They used a fancy scanner to put it in service mode but now the truck won’t come out of it. They tried disconnecting the battery, having the dealership reflash the module, and some other online tricks. It was explained to me, that supposedly, the piston or something retracted too far and got stuck? I managed to hook my scanner up to it when I went to get my things out of the truck and got these codes P0602-00, C15C7-00, C2A1C-00, and C2A1B-00. They said it might need a new module, but they wont be able to get one for a while because they are on national back order. 
So has anyone run into this problem after replacing the rear brakes? Were you able to get it fixed? Also is the shop liable for replacing the module?

Is the shop you are referring to a GM dealership? If so, our team would like to act as an extra layer of assistance and get to the bottom of your concerns. If you are interested in our teams involvement, we can be reached at [email protected]. We are keeping a very close eye out for this. By sending us a message, you consent to the information you provide being monitored and recorded by GM or those acting on GM’s behalf, subject to the GM Privacy Statement: https://www.gm.com/privacy-statement.

[htex88]

1 hour ago, GMCustomerService said:

Is the shop you are referring to a GM dealership? If so, our team would like to act as an extra layer of assistance and get to the bottom of your concerns. If you are interested in our teams involvement, we can be reached at [email protected]. We are keeping a very close eye out for this. By sending us a message, you consent to the information you provide being monitored and recorded by GM or those acting on GM’s behalf, subject to the GM Privacy Statement: https://www.gm.com/privacy-statement.

email sent

[2016 Sierra Owner]

On 7/13/2025 at 12:29 PM, htex88 said:

Also is the shop liable for replacing the module?

Only the shop can really answer that.