What it means
The signal from the battery charger A input current sensor is below the expected electrical range. The reading may be unreliable.
At a glance
- The engine or gearbox may go into limp mode
How it works
Battery Charger A's input-current sensor sends a signal representing current entering the charger. P0D3A sets when that signal is below the module's expected electrical range, which can happen if the signal is pulled toward ground or the sensor is internally shorted.
Common causes
Most likely first.
- Signal wire shorted to ground
- Internal sensor short
- 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
- Save freeze-frame data and check the live Battery Charger A input-current sensor signal to confirm it is low when the code sets.
- With the vehicle powered down according to its service instructions, inspect the sensor connector for corrosion, damaged pins, or poor contact that could add resistance.
- Inspect the signal wire for damage or contact with ground, paying particular attention to areas where the harness bends or is secured.
- Test the signal circuit for a short to ground and check its power and ground connections against the wiring diagram and manufacturer's specification.
- If the wiring and connector are sound, test the sensor for an internal short using the approved procedure.
Common fixes
- Clean and secure corroded or loose connector terminals.
- Repair a signal wire shorted to ground or otherwise damaged.
- Replace the input-current sensor if testing confirms an internal short.
- Verify Battery Charger A reports a plausible input-current signal during charging.
Can I keep driving?
Charging may not start or may be interrupted or slowed because the charger input-current signal is too low to trust. Do not rely on the vehicle reaching its intended charge level before a trip.
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.