Powertrain
generic / SAE
P04D6
Exhaust Brake Input Circuit High
Same as P04D3 with the signal voltage above the plausible range. 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 / D6
Possible causes
- Signal shorted to supply high
- Connector pins corroded - high contact resistance low
- Supply wire pinched against B+ source low
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 120–450 €
- Estimated time: 0.6–1.8 h
- Component: exhaust brake request switch
- MIL / check engine light
Sources
References
sae:J2012