Powertrain
generic / SAE
P049F
Exhaust Pressure Control Valve B
A general circuit fault is detected on the second exhaust pressure control valve (B) - used for example on dual exhaust brakes, twin-bank diesels with separate back-pressure flaps, or for DPF regeneration backpressure assist on the second bank. The ECU loses control of this stage.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / 9F
Possible causes
- Open in harness or actuator winding high
- Connector corroded by exhaust heat or moisture medium
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 200–900 €
- Estimated time: 1–3.5 h
- Component: exhaust pressure valve b
- Component: exhaust pressure actuator b
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012