Exhaust Brake Input Circuit Range or Performance
Same as P04D3 with the signal in plausible range yet not matching expected behaviour - e.g. activation request without driver input or no response after a request.
Affected components
- Exhaust brake request switch
Common causes
- High likelihood: Signal implausible against driver action or bus
Diagnostic notes
- The malfunction indicator lamp may illuminate
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.