Powertrain, generic · Hybrid propulsion

P0D45 Battery Charger 14 Volt Output Voltage Sensor Circuit High

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P0D45 is stored when the charger's 14 V output voltage sensor reads too high. GM's battery charger control module in the Volt and ELR fails it at a reading of 16.88 V or above for 400 of 500 ms; the 2011 table rates it Type A, the 2014 table Type B, meaning the MIL comes on only after two consecutive trips. That value lies above the normal regulation band of a 12 V system, so either a genuine overvoltage at the output or a sensor reading stuck high is possible. The low counterpart is P0D44, and the plausibility check P0D43 pauses while either code is active. As with its siblings, the fault sits in the charger's own low-voltage stage rather than in the car's main DC/DC converter.

Likely causes

Voltage sense signal shorted to a higher potential inside the charger
Charger low-voltage stage regulating too high
Charger module software

Symptoms

  • MIL on (GM, after two trips in later model years)
  • Charging may stop

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–2,500
Time0.5–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

battery charger 14v output voltage sensoron board charger

Related codes

P0D44P0D43P0D42P0D46P0D5B

References: gsi.ext.gm.com, gsi.ext.gm.com.