P0D42Battery Charger 14 Volt Output Voltage Sensor Circuit
- Generic OBD-II code · Powertrain
- How the car detects it
- P0D42 is the circuit code for the sensor that measures voltage at the 14 V output of the battery charger, a low-voltage DC stage built into the on-board charger and distinct from the vehicle's main DC/DC converter. GM's charger module in the Volt and ELR has such an output and monitors its voltage with P0D43-P0D45, yet no manufacturer publishes P0D42 itself. A Ford patent explains the purpose of such a stage: a small converter inside the charger keeps the 12 V bus supplied during charging, so the main contactors and the large converter can stay off. CARB requires circuit checks on inputs of this kind. A fault can leave the 12 V side unsupported while plugged in or interrupt charging; driving is not directly affected.
- What you may notice
- 12 V battery discharges while the car is plugged in
- Charging is interrupted
- Likely causes
- PossibleOpen or shorted voltage sense circuit of the charger's low-voltage stage
- PossiblePoor 12 V or ground connection at the charger
- RareFailed on-board charger electronics
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.