What it means
Battery charger A output voltage does not meet the expected performance criteria. Charging operation may be affected.
How it works
Battery charger A converts incoming charging power into output for the vehicle's battery system. P0D20 sets when the module finds charger A's output voltage does not meet its performance criteria, without identifying a specific too-low condition.
Common causes
Most likely first.
- Battery charger fault
- Charging circuit or connection fault
Symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
How to diagnose it
- Read freeze-frame and charging live data for charger A's commanded and measured output voltage, along with any charger or battery codes.
- Check whether the fault occurs with one charging source or cable, then inspect the charge inlet, cable, and charger A connections for damage or poor seating.
- Inspect accessible charger A wiring and connectors for corrosion, looseness, or heat damage, following the manufacturer's shutdown procedure.
- Use the scan tool's charging test, if available, to compare charger A's output response with the manufacturer's specification.
- If the connections and input are sound but output performance remains out of specification, test charger A and its charging circuit using the manufacturer's procedure.
Common fixes
- Reseat or replace a damaged external charging cable or connector, if confirmed faulty.
- Clean or repair poor connections in charger A's circuit.
- Repair damaged charging-circuit wiring.
- Replace charger A if its output fails the manufacturer's test.
Can I keep driving?
Avoid depending on the vehicle for a trip that requires a full charge if charging repeatedly stops or remains slower than expected. Stop charging if the cable, inlet, or vehicle shows heat damage or a charging safety warning.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.