Won’t Detect New Brake Pads/Pad Monitor

Bucky7711 · Aug 10, 2026

Hi all- was wondering if anyone has any advice as I am having an issue with my 2022 AT4 not detecting new brake pads. Just replaced the rear pads only with a new pad sensor. I used all GM parts, no aftermarket. Followed the correct procedure of placing the vehicle in brake service mode. Confirmed that it came out of service mode when I was finished installing the pads. The vehicle won’t detect the new rear pads to allow me to reset the pad life. Dash still is saying I need to service the brake monitor. When I go to the pad life screen, Service System remains on in red and cannot select “rear pads installed”. Truck has 48,800 miles on it and the front pads are still at about 40% or so. Anyone else come across this with any advice? Any help would be greatly appreciated. Thanks for your time….

pinebaron · Aug 10, 2026

Welcome. Lets wait for @gemarsh to respond. He usually has most answers.

Bucky7711 · Aug 10, 2026

pinebaron said:
Welcome. Lets wait for @gemarsh to respond. He usually has most answers.

Thanks very much, I appreciate it.

gemarsh · Aug 11, 2026

Welcome.

Try this procedure. Hopefully it will work, otherwise it will require a trip to someone with a bidirectional scan tool that is capable. (More than likely) 🫩

1. Turn the ignition to the ON position without starting the engine.

2. Press and hold the brake pedal firmly.

3.Navigate to the Driver Information Center using steering wheel controls.

4.Select Vehicle Settings from the main menu.

5. Choose Brake Pad Life from the submenu.

6. Press and hold the reset button for 3 seconds.

7. Confirm the reset when prompted on the display.

gemarsh · Aug 11, 2026

Step 1. Push the start button long enough to turn ON the whole dash (service mode). Not just the quick push ACC mode.

Chopper_Man · Aug 11, 2026

You have a "fault" in your pad monitor system. Per your post: "Dash still is saying I need to service the brake monitor."
You cannot reset it due to that fault, it has nothing to do with pad life or resetting due to new brake pads. You need to find the cause of the fault and start there. Inspect all wiring, reseat the sensor plug etc.

Bucky7711 · Aug 11, 2026

gemarsh said:
Welcome.

Try this procedure. Hopefully it will work, otherwise it will require a trip to someone with a bidirectional scan tool that is capable. (More than likely) 🫩

1. Turn the ignition to the ON position without starting the engine.

2. Press and hold the brake pedal firmly.

3.Navigate to the Driver Information Center using steering wheel controls.

4.Select Vehicle Settings from the main menu.

5. Choose Brake Pad Life from the submenu.

6. Press and hold the reset button for 3 seconds.

7. Confirm the reset when prompted on the display.

Thanks for the advice, didn’t work though so I will have to dig a little deeper. I really appreciate it!

Bucky7711 · Aug 11, 2026

Chopper_Man said:
You have a "fault" in your pad monitor system. Per your post: "Dash still is saying I need to service the brake monitor."
You cannot reset it due to that fault, it has nothing to do with pad life or resetting due to new brake pads. You need to find the cause of the fault and start there. Inspect all wiring, reseat the sensor plug etc.

Yeah, I am beginning to think there is an issue with the plug for the new wear sensor. I even went so far as to check continuity on the sensor itself, it is good. Tried to reseat the sensor head several times in the new pad, will have to pull the wheel and root around some more.Thanks for your advice, I appreciate your time.

pinebaron · Aug 11, 2026

Bucky7711 said:
Yeah, I am beginning to think there is an issue with the plug for the new wear sensor. I even went so far as to check continuity on the sensor itself, it is good. Tried to reseat the sensor head several times in the new pad, will have to pull the wheel and root around some more.Thanks for your advice, I appreciate your time.

Perhaps another wild and stupid suggestion here: Disconnect batteries for around 30 minutes; reconnect and see if it still shows the same message.

R467X · Aug 11, 2026

You're going to have to get your hands on an expensive scanner and run it for error codes

pinebaron · Aug 11, 2026

You can go to Autozone or O'Reilly Auto Parts for a free scan.

Bucky7711 · Aug 12, 2026

R467X said:
You're going to have to get your hands on an expensive scanner and run it for error codes

I have ordered one because of this issue, thanks.

FirstTimeTruckOwner · Aug 13, 2026

gemarsh said:
Step 1. Push the start button long enough to turn ON the whole dash (service mode). Not just the quick push ACC mode.

Hey @gemarsh is the above how you put the truck in "brake service mode?"

I've seen a few videos where the person holds down the brake pedal and the parking brake button for like 20 seconds, but your way seems easier? I have a 2023 FWIW.

I'm swapping out my rear pads tomorrow and want to ensure I don't have any issues with the parking brake.

Thanks!

gemarsh · Aug 13, 2026

FirstTimeTruckOwner said:
Hey @gemarsh is the above how you put the truck in "brake service mode?"

I've seen a few videos where the person holds down the brake pedal and the parking brake button for like 20 seconds, but your way seems easier? I have a 2023 FWIW.

I'm swapping out my rear pads tomorrow and want to ensure I don't have any issues with the parking brake.

Thanks!

No.

If you don't have a scanner this video instructions is probably what you have seen.

Bucky7711 · Aug 14, 2026

Just to give a quick update, I had to buy a scanner to clear the DTC and now I have no issues. Front brake pads show 48% and the rears at 100% as they should be. Thanks to all that responded and gave advice, I appreciate you all.