Actuator Supply Voltage "B" Circuit Low

Possible causes

• CommonOne actuator failed internally and is loading the supply
• CommonSupply circuit shorted to earth
• CommonWater in a connector bridging the supply to earth
• PossibleHigh resistance in the supply wiring or a corroded connector
• PossibleWeak battery or charging fault dragging the whole system down
• PossibleFailed control module supply driver

What you might notice

• Several actuator codes at once
• Limp mode or reduced power
• Actuators operating weakly or intermittently
• Check engine light on

What to check, in order

1. Check battery and charging voltage first. A weak supply to the whole vehicle shows up here before it shows up anywhere else.
2. Disconnect actuators on supply "B" one at a time while watching the supply voltage.
3. Look for water in connectors bridging the supply to earth.
4. Perform a voltage drop test on the supply circuit to find high resistance.
5. Fix the supply before diagnosing the individual actuator codes stored alongside.