Conditions for Setting the DTC
WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
P27EB
Transmission Range Control Valve 1 Position Switch = 1.26 to 1.50 V - For greater than 1 s
P27ED
Transmission Range Control Valve 1 Position Switch = Less than 0.41 V - For greater than 1 s
P27EE
Transmission Range Control Valve 1 Position Switch = Greater than 2.54 V - For greater than 1 s