P0D11Battery Charging System Negative Contactor A Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- How the car detects it
- P0D11 is the open-circuit and driver check for negative charging contactor A. GM uses it on the Chevrolet Volt (2011, 2014) and the Cadillac ELR: the module compares the commanded driver state with what the line shows; with the driver off, an output above 4 V (2011: 2 V) means open and one close to supply voltage a short to power, and with the driver on a coil current below 57 mA is judged open as well. 40 failing samples out of 50 at 12.5 ms set it as Type A, MIL after one trip; the status of the charging HVIL source is part of the enable conditions. As on the positive side, a short to ground lies outside this test. The positive counterpart is P0D0A, plausibility, low and high are P0D12–P0D14. The vehicle will not charge.
- What you may notice
- Malfunction indicator lamp after one trip (GM Type A)
- Vehicle does not charge
- Likely causes
- LikelyOpen or high-resistance coil control wire or connector
- PossibleContactor coil open
- RareControl wire shorted to a supply voltage
- RareFaulty driver stage in the control module
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.