P2D71Battery Charging System Negative Contactor D Stuck Closed
- Generic OBD-II code · Powertrain
- Can trigger limp mode
- How the car detects it
- P2D71 indicates that negative charging contactor D has stayed closed after an open command, as happens when the contacts fuse. No manufacturer documents P2D71 publicly. A Toyota patent addresses a pitfall of this check: after DC charging the car asks the station to stop, but some stations keep feeding, and the leftover inlet voltage would wrongly suggest welded relays. Toyota therefore repeats a suspicious result after opening the main relays and draining the capacitor, then opens one charge relay at a time against a threshold of a few to a few tens of volts. A Ford patent adds the consequence: one weld locks charging, a weld on both poles also stops the car from driving. P2D72 is the opposite fault, P2D6A the plus side.
- What you may notice
- Charging locked after a DC session
- Vehicle may refuse to become ready if the plus side is welded as well
- High-voltage warning at start-up
- Likely causes
- LikelyFused contacts in minus contactor D
- RareStation kept supplying voltage during the check
- RareCoil held on by a faulty output stage
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €200 – €4,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.