P0D4B: 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. 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.

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

Charging interrupts now and then
12 V battery voltage fluctuates while plugged in

Most likely causes

Loose low-voltage connector or ground at the charger
Intermittent contact in the charger's current sense circuit
Electrical interference on the low-voltage network

What to check, in order

Start with the simplest. You can tick off each step.

Read the codes with a hybrid-compatible scanner and write down the freeze frame data
Gently move the wiring with the engine running and watch whether the reading changes.
Make sure the battery cooling air intake is clean
Check the 12 V auxiliary battery, which can also trigger warnings
Leave any high-voltage measurements to a specialized repair shop

What each character of P0D4B means

P: Powertrain: engine and transmission
0: Generic code: same on every make
D: Subsystem depends on the code range
4B: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0D4B?

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 P0D4B?

The most common causes are: loose low-voltage connector or ground at the charger; intermittent contact in the charger's current sense circuit; electrical interference on the low-voltage network.

Related codes

Sources

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.