P0D4BBattery Charger 14 Volt Output Current Sensor Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- How the car detects it
- P0D4B covers an erratic or intermittent signal from the current sensor in the battery charger's 14 V output. No manufacturer documents it publicly; GM's Volt and ELR charger module uses only the low and high codes P0D49 and P0D4A for this measurement. As a Ford patent describes, such a charger-internal low-voltage stage can support the 12 V system during charging, so an unsteady current value may make the charger cut that stage in and out. CARB's comprehensive component requirements cover sporadic signal faults of inputs in general. Likely causes are loose connectors at the charger, internal contact problems or electrical interference; repair usually starts with the charger's low-voltage connections before the charger itself is replaced.
- What you may notice
- Charging interrupts now and then
- 12 V battery voltage fluctuates while plugged in
- Likely causes
- PossibleLoose low-voltage connector or ground at the charger
- PossibleIntermittent contact in the charger's current sense circuit
- RareElectrical interference on the low-voltage network
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €50 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.