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.
P077B
The hybrid/EV powertrain control module 1 detects an incorrect OSS direction.
P077C
The hybrid/EV powertrain control module 1 detects the output speed sensor signal voltage is less than 0.36V for 0.25 s.
P077D
The hybrid/EV powertrain control module 1 detects the output speed sensor signal voltage is greater than 4.25V for 0.25 s.