Fuel Volume Regulator B Control Circuit Performance
The ECU sees implausible feedback on the control loop for fuel volume regulator B - duty cycle does not match measured rail pressure response. The regulator either reacts too slowly, sticks, or has shifted from its calibration.
Affected components
- Fuel volume regulator b
- High pressure pump b
- Fuel rail
Common causes
- High likelihood: Regulator stem sticking due to debris or wear
- Medium likelihood: High-pressure pump wear changes regulator response
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
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.