P0D97: Battery Charger Coupler Unlock Control Circuit High

What it means

The coupler unlock control circuit voltage is higher than expected. This can prevent the connector from being released, and may interrupt charging.

At a glance

• Usually lights the check-engine light
• The engine or gearbox may go into limp mode

How it works

The coupler unlock actuator releases the charging connector from the inlet, and the charger monitors voltage on its unlock control circuit. P0D97 sets when that voltage is higher than expected, which can result from a short to battery power, an open actuator, or a poor connector contact.

Common causes

Most likely first.

1. Wire shorted to B+
2. Open actuator
3. Connector pins corroded - high contact resistance

Symptoms

• Charge status indicator shows fault
• Charging may not start or interrupts
• Slower-than-expected charge rate

How to diagnose it

1. Check freeze-frame and live charging data to see whether the high circuit reading appears when the vehicle commands coupler unlocking.
2. Inspect unlock-circuit wiring for contact with a battery-positive feed, damaged insulation, or an incorrectly routed repair.
3. Check the actuator connector for corrosion, loose terminals, or pins that are not making proper contact.
4. Use a scan tool, if supported, to command unlocking and note whether the actuator operates while the circuit remains high.
5. Test the unlock control wire for a short to battery power and test the actuator circuit using the manufacturer's procedure.

Common fixes

• Repair wiring shorted to battery power.
• Repair loose, corroded, or damaged unlock-circuit terminals.
• Restore the actuator connection if an open connection is causing the high reading.
• Replace the coupler unlock actuator if its internal circuit is open or faulty.

Can I keep driving?

The connector may not release correctly, leaving it locked after charging, and charging may be interrupted. Do not pull or pry it free; use the manual release procedure in the vehicle's instructions.