Lost Communication with Drive Motor Control Module
The Drive Motor Control Module has stopped transmitting on the vehicle data bus, so other control units no longer receive its messages. On a hybrid or EV the electric drive can shut down or limit power. Typical causes are loss of power or ground at the module, an open or shorted CAN/LIN bus wire, a connector fault, or an internal module failure.
Affected components
- Drive motor control module
- Can bus wiring
Common causes
- High likelihood: Drive motor module unpowered
- Medium likelihood: CAN wiring to drive motor module broken
- Low likelihood: Gateway module routing CAN messages incorrectly
Possible symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Diagnostic notes
- The malfunction indicator lamp may illuminate
- Reduced-power or limp mode may occur
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.