P31E7 on 2021 Audi e-tron — AC Power Supply Cable - Open Circuit
1 vehicles · 1 makes
Most Reported On
P31E7 is an OBD-II diagnostic trouble code meaning “AC Power Supply Cable - Open Circuit.” The high-voltage battery charger has detected an open circuit on the AC power supply cable path - it cannot see continuity on the incoming AC charging conductor it expects. AC charging is blocked. Audi TSB 2061788 lists DTC P31E700 among the codes stored in J1050 on 2020-2021 e-tron quattro and e-tron Sportback vehicles running onboard-charger software 0070, where the underlying cause was charger software rather than a broken cable. This code is most commonly reported on 2021 Audi e-tron.
Common Causes
Diagnostic Tools
P31E7 does not use the standard P/B/C/U prefix. It may be a manufacturer-specific code, so verify that a scanner supports your exact year, model and module before buying.
FAQ
What does P31E7 mean?
P31E7 stands for "AC Power Supply Cable - Open Circuit." The high-voltage battery charger has detected an open circuit on the AC power supply cable path - it cannot see continuity on the incoming AC charging conductor it expects. AC charging is blocked. Audi TSB 2061788 lists DTC P31E700 among the codes stored in J1050 on 2020-2021 e-tron quattro and e-tron Sportback vehicles running onboard-charger software 0070, where the underlying cause was charger software rather than a broken cable.
What are the most common causes of P31E7?
The most common causes of P31E7 are: Outdated onboard-charger software (level 0070) generating a false open-circuit detection - Audi TSB 2061788, Damaged or worn AC charging cable / portable charger unit, Poor connection or corroded pins at the AC charging socket, Open or high-resistance AC supply wiring between the socket and J1050, Failed wall box or supply-side circuit. The specific cause varies by vehicle.
How much does it cost to fix P31E7?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by P31E7?
Au7o has documented P31E7 across 1 vehicle models from 1 manufacturers: Audi.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.