Conditions for Setting the DTC
WARNING: This page is about a different car, the 2016 GMC Acadia, 2016 Chevrolet Traverse, and 2016 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
P2534
The TCM detects 6 V or less on the ignition voltage circuit, with the ignition turned ON.
P2535
The TCM detects greater than 6 V or greater on the ignition voltage circuit, with the ignition turned OFF.