Battery Charger A Input Voltage Sensor B Circuit Low

Where it lives

For P0EF9, the circuit described runs through the sensor. The description of P0EF9 reports a fault at the sensor.

Check these first

• A short to ground on the charger A input voltage sensor B signal wire
• An open in the sensor B circuit
• A failed charger A input voltage sensor B
• A loose connector at sensor B

What to do next

1. Read charger A input voltage sensor B on a scan tool
2. Test the sensor B signal wire for a short to ground
3. Check the sensor B connector and pins
4. Measure the sensor B resistance
5. Replace the charger A input voltage sensor B if faulty
6. Clear the code and retest

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