Powertrain
generic / SAE
P04D3
Exhaust Brake Input Circuit
The exhaust brake activation input - typically from a stalk lever, brake pedal switch, or vehicle bus message - shows a circuit fault. The ECU cannot accept a request to engage the exhaust brake, which limits engine braking on heavy vehicles.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / D3
Possible causes
- Open in switch circuit high
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 120–450 €
- Estimated time: 0.6–1.8 h
- Component: exhaust brake request switch
- Component: exhaust brake actuator
- MIL / check engine light
Sources
References
sae:J2012