P0D21Battery Charger A Output Voltage Too Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- How the car detects it
- P0D21 is set when the high-voltage output of the on-board charger stays below what the controller expects. GM's Volt and ELR tables split the test in two: during normal charging the charger bus must not fall under 150 V, and when the charger only powers the battery heater, the bus must reach at least 75 % of an expected value calculated from charger current times 70 ohms. Eight failures in ten samples store it as Type B, lighting the MIL on the second trip. Stellantis stores P0D21-00 in the integrated dual charging module (IDCM) of the Jeep Wrangler 4xe from 2021, the Grand Cherokee 4xe from 2022 and the Pacifica Plug-in Hybrid from 2022, with MIL and no charging, and reflashes the IDCM. P0D20 covers a deviation in constant-voltage mode, P0D85 excess voltage.
- What you may notice
- Vehicle does not charge
- MIL, often after two charging trips
- Battery not preheated while plugged in during cold weather
- Likely causes
- LikelyCharger module software (Stellantis IDCM bulletins)
- PossibleFailing power stage inside the charger
- RareHigh resistance or fault in the charger's high-voltage output path or heater load
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €0 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.