0xD90B0C Trailer Control Modulator backup valve-Bad Intelligent Device Or Component
â–¶ How to fix
Action: -Erase fault memory and check the lines and plugs between central ECU and the TCM
What you'll see
Symptom:
System reaction
SystemReaction: ESP control restricted. HSA off. Trailer Control and CFC functions are not available
Diagnostic depth
Detection
Detection: Hardware fault detected in TCM or in central ECU
Possible cause
Cause: Damage in the wiring (low insulation restiance to vehicle ground or interruption) and/or connectors between TCM and central ECU, damaged TCM backup valve or central ECU