P0DA1: Battery Charger A Coupler Lock Position Sensor Circuit High

What it means

The ECM detects a high fault on the battery charger a coupler lock position sensor circuit. Reading cannot be used reliably for control.

At a glance

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

How it works

The battery charger A coupler lock position sensor reports whether the connector is secured. This code sets when its circuit signal is higher than the control module expects, which can result from a signal short to battery voltage or an open sensor.

Common causes

Most likely first.

1. Signal wire shorted to B+
2. Open sensor
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. Record freeze-frame data and check live lock-position status as the charger A coupler is moved between unlocked and locked positions.
2. Inspect the lock-position sensor connector for disconnection, corrosion, or damage, and look for broken wiring or insulation touching a power feed.
3. With the vehicle made safe according to its service information, test the signal wire for an open circuit and a short to battery voltage.
4. Test the lock-position sensor against the manufacturer's specification to determine whether it is open.
5. If the sensor and wiring pass, check the module input using the vehicle's diagnostic information.

Common fixes

• Reconnect a loose lock-position sensor connector and repair damaged wiring.
• Clean corroded connector terminals and restore secure pin contact.
• Repair an open signal wire or short to battery voltage.
• Replace the charger A lock-position sensor if it tests open or out of specification.

Can I keep driving?

Charging may be blocked or interrupted because the vehicle cannot trust the lock-position signal. Do not charge with a coupler that fails to lock securely, and do not force the connector into place.