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.
Affected components
- Exhaust pressure valve b
- Exhaust pressure actuator b
Common causes
- High likelihood: Open in harness or actuator winding
- Medium likelihood: Connector corroded by exhaust heat or moisture
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Related codes
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.