Conditions for Setting the DTC
WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
P0815
Hybrid/EV Powertrain Control Module 1 detects an Up request for 10 min with the shift lever in a forward range.
P0816
Hybrid/EV Powertrain Control Module 1 detects a Down request for 10 min with the shift lever in a forward range.
P0826
Hybrid/EV Powertrain Control Module 1 detects an invalid voltage on the Up/Down signal circuit for 1 min.