A no start condition due to a dead battery may be found on some 2023 Blazers along with intermittent cruise control operation. Along with these conditions, the brake lights may stay on a times. (Fig. 5)
If these conditions are present, check for a possible concern with the brake pedal position sensor or a sticking brake pedal.
Fig. 5
Perform a battery draw test to determine the cause of the dead battery. If no draw can be found, check if the brake lights stay on by applying and releasing the brake pedal at various speeds multiple times while an assistant watches the brake lights.
If the illuminated brake lights condition can be duplicated, perform a Brake Pedal Position (BPP) learn in both the Body Control Module (BCM) and Engine Control Module (ECM). After the learn procedure, attempt to duplicate the brake lights condition again. If the condition can be duplicated after performing the BPP learn, replace the brake pedal assembly. (Fig. 6)
Fig. 6
If the illuminated brake lights condition cannot be duplicated, and no other cause is identified for a battery draw, perform only the BPP learn to update the BPP sensor calibration.
– Thanks to David Goodrow
