P0D28: Battery Charger Input Voltage Too High

What it means

The battery charger monitors the voltage supplied at its input during charging. It sets this code when that voltage rises above the expected range.

How it works

The battery charger monitors the voltage supplied at its input during a charging session. P0D28 sets when that input voltage rises above the expected range, and the charger may limit or stop charging to protect its circuits.

Common causes

Most likely first.

1. Supply voltage outside the expected range
2. Charging inlet, wiring, or connection fault

Symptoms

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

How to diagnose it

1. Review freeze-frame and live input-voltage data to see whether the high reading occurred with a particular supply or charging event.
2. Stop using the charging supply associated with the fault and check the plug and inlet for damage, heat marks, moisture, or poor fit.
3. If available, compare operation on another suitable charging supply to determine whether the fault follows the supply or the vehicle.
4. Inspect accessible input wiring and connectors for damage or unintended contact, following the manufacturer's safety instructions.
5. Have the input circuit and charger voltage monitoring tested against the manufacturer's specification.

Common fixes

• Stop using a charging supply confirmed to be outside the vehicle's expected range.
• Repair or replace damaged inlet wiring or connector terminals.
• Correct a poor or damaged charging connection.
• Replace the charger if testing confirms an internal input-voltage fault.

Can I keep driving?

Stop charging on the supply associated with the high-voltage fault until it has been checked, and do not repeatedly retry if the vehicle stops the session. Continued use of an out-of-range input may damage the charger or other charging components.