P0E8A: Battery Charger B Current Sensor Circuit

What it means

The ECM detects a circuit fault on the battery charger b current 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

Battery charger B’s current sensor reports how much input current the charger is drawing, allowing the control module to manage charging. P0E8A sets when the sensor circuit has an electrical fault and its current reading cannot be trusted.

Common causes

Most likely first.

1. Sensor failed
2. Wiring or connector fault

Symptoms

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

How to diagnose it

1. Read freeze-frame and live charging data to see whether the current sensor fault appears before or during charger B operation.
2. Inspect the current sensor connector and accessible wiring for looseness, corrosion, moisture, or physical damage.
3. Check the sensor circuit for opens, shorts, and poor terminal contact using vehicle wiring information.
4. Compare the sensor reading with an appropriate independent current measurement using the manufacturer’s diagnostic procedure.
5. If wiring and connections are sound, test the current sensor and charger B as specified by the manufacturer.

Common fixes

• Reconnect and secure the current sensor connector.
• Repair damaged wiring or corroded terminals in the current sensor circuit.
• Replace the current sensor if its output fails the specified test.
• Repair charger B if the sensor circuit checks out but charging remains faulty.

Can I keep driving?

Charger B may charge slowly, stop, or fail to start because the control module cannot rely on its current reading. Confirm the battery’s charge before driving and avoid relying on charger B until the fault is addressed.