P0D43: Battery Charger 14 Volt Output Voltage Sensor Circuit Range/Performance

P0D43 says the voltage reported for the charger's 14 V output does not fit other measurements of the low-voltage system. GM's battery charger control module in the 2011-2014 Volt and the ELR compares the reading with the run/crank signal voltage and with the voltage of a further enable line (HVEMB); a difference of 6 V or more for 4 of 5 s stores a Type A fault with MIL. The test is suspended while the out-of-range codes P0D44/P0D45 or a reference voltage fault are present. In GM's design this output is a low-voltage DC stage inside the charger, separate from the Volt's accessory power module. A failing sense circuit in the charger is most likely, a poor ground or 12 V feed less so; charging can be affected.

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

MIL on (GM)
Charging interrupted or not completed

Most likely causes

Low-voltage sense circuit inside the charger reads wrong
Poor ground or 12 V feed at the charger skews the comparison
Charger module software

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
Compare the reading with other engine data while varying the engine speed.
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 P0D43 means

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

Frequently asked questions

Can I keep driving with code P0D43?

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 P0D43?

The most common causes are: low-voltage sense circuit inside the charger reads wrong; poor ground or 12 V feed at the charger skews the comparison; charger module software.

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.