P0D4C is the general circuit code for the sensor that reports the DC voltage the on-board charger delivers to the high-voltage traction battery. No manufacturer documents P0D4C publicly; GM (Volt, ELR) and Mitsubishi (Outlander PHEV) split electrical faults of this measurement into the low and high codes P0D4E and P0D4F instead, and GM's Volt checks plausibility with P0D4D. CARB requires plug-in hybrids to detect charger faults that stop or limit charging, which is why such a sensor is diagnosed at all. The code points to an open or otherwise unusable signal path, usually inside the charger itself. Driving normally remains possible, but AC charging is typically refused until the fault is cleared.
High severity. Can I keep driving?If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.
Symptoms
- Plug-in charging does not start or stops shortly after starting
- Charging system warning in the instrument cluster
- Vehicle can still be driven on stored energy or fuel
Most likely causes
- Voltage sensing electronics inside the on-board charger failed
- Interrupted signal path or poor internal connection in the charger
- Charger software fault, fixed by reprogramming
What to check, in order
Start with the simplest. You can tick off each step.
What each character of P0D4C means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- D: Subsystem depends on the code range
- 4C: Specific fault in that system
Frequently asked questions
Can I keep driving with code P0D4C?
If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.
What causes code P0D4C?
The most common causes are: voltage sensing electronics inside the on-board charger failed; interrupted signal path or poor internal connection in the charger; charger software fault, fixed by reprogramming.
Related codes
- P0D4DBattery Charger Hybrid/EV Battery Output Voltage Sensor Circuit Range/Performance
- P0D4EBattery Charger Hybrid/EV Battery Output Voltage Sensor Circuit Low
- P0D4FBattery Charger Hybrid/EV Battery Output Voltage Sensor Circuit High
- P0D50Battery Charger Hybrid/EV Battery Output Voltage Sensor Circuit Intermittent/Erratic
- P0D51Battery Charger Hybrid/EV Battery Output Current Sensor Circuit
- P0D5CBattery Charger Hybrid/EV Battery Output Power Performance
Sources
- law.cornell.edu: 13 CCR 1968.2
- gsi.ext.gm.com: 11OBDG01 HYBRID Diagnostics
- mitsubishitechinfo.com: M154950430001700USA
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.