Exhaust Flow Control Valve A Control Circuit High
Voltage on the exhaust flow control valve A control line is above the expected window. The exhaust control valve modulates exhaust backpressure or routing (EGR feed, sound, regen support); a malfunction shifts torque mapping and may trigger limp mode.
Affected components
- Exhaust flow valve a
- Solenoid
- Wiring harness
Common causes
- High likelihood: Control wire shorted to B+
- Medium likelihood: Open solenoid coil
- Low likelihood: Connector pins corroded - high contact resistance
Diagnostic notes
- The malfunction indicator lamp may illuminate
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.