Actuator Supply Voltage B Circuit Low
The supply voltage to actuator group B (e.g. solenoids, valves driven by ECU) is below the calibrated threshold. The affected actuators may be slow or unable to switch.
Affected components
- Actuator supply relay
- Main wiring
Common causes
- High likelihood: Faulty supply relay
- Medium likelihood: Wire shorted to ground
- Low likelihood: Connector pins corroded - high contact resistance
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.