P0D4B code meaning
Battery Charger 14 Volt Output Current Sensor Circuit Intermittent/Erratic
What P0D4B means
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.
P0D4B at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0D4B
- Charging interrupts now and then
- 12 V battery voltage fluctuates while plugged in
Common causes of P0D4B
- PossibleLoose low-voltage connector or ground at the charger
- PossibleIntermittent contact in the charger's current sense circuit
- Less likelyElectrical interference on the low-voltage network
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Battery charger 14v output current sensorWiring harnessOn board charger
What each part of P0D4B means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 4B | The exact fault in that area. |
What to do next
- Note P0D4B and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0D4B
What does P0D4B mean?
P0D4B means "Battery Charger 14 Volt Output Current Sensor Circuit Intermittent/Erratic". P0D4B covers an erratic or intermittent signal from the current sensor in the battery charger's 14 V output. It is a generic code, so it means the same on every make.
Is it safe to drive with P0D4B?
P0D4B does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P0D4B fail an emissions test?
P0D4B is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P0D4B to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P0D4B clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.