Powertrain
generic / SAE
P04D7
Exhaust Brake Input Circuit Intermittent or Erratic
Same as P04D3 with intermittent or erratic signal. The exhaust control valve modulates exhaust backpressure or routing (EGR feed, sound, regen support); a malfunction shifts torque mapping and may trigger limp mode.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / D7
Possible causes
- Intermittent contact at connector high
- Connector with intermittent contact under vibration low
- Harness routed against vibrating component low
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 wiring
- MIL / check engine light
Sources
References
sae:J2012