Lost Communication with Power Steering Control Module
The vehicle network has lost the electric power steering (EPS) control module. Power assist drops out, the steering becomes heavy and the EPS warning lamp lights up.
Affected components
- Eps module
- Can bus wiring
Common causes
- High likelihood: EPS module unpowered
- Medium likelihood: CAN wiring to EPS damaged
- 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
Related codes
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.