P0D40: Battery Charger A Input Voltage Sensor A Circuit High

P0D40 is the high-signal fault of the charger's input voltage sensor. GM's Volt charger module (2011 and 2014 tables) sets it when the measured AC peak exceeds 422 V for 160 of 200 ms and lights the MIL as a Type A fault; in the 2016 and 2019 Volt the controller reads a duty-cycle signal and fails it at 92 % and above or at a constant 0 %, Type B over two trips. Mitsubishi's 2022 Outlander PHEV reads a sensor voltage above 3.161 V, corresponding to more than 492 V, for 0.5 s as a short to power, stops charging and replaces the charger/DC-DC unit. Household and Level 2 supplies do not reach these values, so the sensor path or the signal line is normally to blame. P0D3F is the low counterpart.

Symptoms

• AC charging is refused
• MIL on (GM)

Most likely causes

• Voltage sensor signal shorted to supply inside the charger
• Open duty-cycle signal line between charger and controller (2016-2019 Volt)
• Failed on-board charger

What to check, in order

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

1. Read the codes with a hybrid-compatible scanner and write down the freeze frame data
2. Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
3. Make sure the battery cooling air intake is clean
4. Check the 12 V auxiliary battery, which can also trigger warnings
5. Leave any high-voltage measurements to a specialized repair shop

What each character of P0D40 means

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

Frequently asked questions

Can I keep driving with code P0D40?

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 P0D40?

The most common causes are: voltage sensor signal shorted to supply inside the charger; open duty-cycle signal line between charger and controller (2016-2019 Volt); failed on-board charger.

Related codes

• P0D3FBattery Charger A Input Voltage Sensor A Circuit Low
• P0D3EBattery Charger A Input Voltage Sensor A Circuit Range/Performance
• P0D3DBattery Charger A Input Voltage Sensor A Circuit
• P0D41Battery Charger A Input Voltage Sensor A Circuit Intermittent/Erratic
• P0D28Battery Charger Input Voltage Too High

Sources

• gsi.ext.gm.com: 11OBDG01 HYBRID Diagnostics
• gsi.ext.gm.com: 19OBDG01 Hybrid Diagnostics
• mitsubishitechinfo.com: M154950420001000USA

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.