What it means
The charge port door B unlock control reports a circuit high condition. Door cannot be commanded to unlock reliably.
At a glance
- Usually lights the check-engine light
How it works
The charge port door B unlock actuator uses a monitored electrical circuit to release the door on command. This code sets when the module sees a signal higher than expected in that circuit. A short to a higher voltage, an open or resistive connection, or an internal actuator fault can cause the abnormal high reading.
Common causes
Most likely first.
- Signal circuit shorted to voltage
- Open or high-resistance wiring
- Internal actuator or circuit fault
Symptoms
- Charge-port door B may not unlock reliably
How to diagnose it
- Save freeze-frame data and check for related charge port door B circuit codes that may help identify a shared wiring issue.
- Command door B to unlock and note whether the actuator moves or remains unresponsive.
- Inspect the actuator connector and harness for damaged insulation, corrosion, moisture, or contact with another powered wire.
- Check circuit continuity and connections for an open or high-resistance fault using the manufacturer's wiring information.
- Test the circuit for a short to voltage and compare its response during an unlock command with the manufacturer's specification.
- Test the actuator according to the manufacturer's procedure and replace it if its internal circuit is faulty.
Common fixes
- Secure or clean a loose or corroded door B actuator connector.
- Repair wiring shorted to voltage or an open or high-resistance connection.
- Replace the charge port door B unlock actuator if it fails its circuit test.
Can I keep driving?
Door B may not unlock, so access to that charging inlet can be interrupted. Avoid forcing the door or using the connector to pry it open.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.