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.
P1E1B
The motor control module detects a correlation difference between the Isolation Supply sensor and overall pack voltage.
P1E1C and P1E1E
The motor control module detects Isolation Supply sensor voltage less than 20 V.
P1E1D and P1E1F
The motor control module detects Isolation Supply sensor voltage greater than 40 V.