P31E7 on Audi: How to Diagnose & Fix
AC Power Supply Cable - Open Circuit
1 Audi model · 1 documented issue · 1 critical
P31E7 on Audi by model: symptoms, diagnosis and fix
Audi TSB 2061788/2 covers model-year 2021 e-tron quattro and e-tron Sportback vehicles with specified AC/DC charging interruptions, charging-flap operation problems, or an app request for auxiliary heating that does not pre-heat the vehicle when matching DTCs are stored in high-voltage battery charger control module J1050. Audi attributes the documented condition to onboard-charger software and identifies old software level 0070, not a proven failed charger module.
Common Symptoms
- AC or DC charging is interrupted
- DC charging does not start or stops at some stations
- Charging-flap button is inoperative or the flap does not open
- Auxiliary heating is activated through the app but the vehicle does not pre-heat
How to Fix
Record whether the failure is AC, DC or station-specific and have J1050 scanned before parts. If the vehicle has the matching condition and software level 0070, Audi directs an SVM update to software 0079 or higher. After the update, reproduce the concern and follow the guided test plan for any new active DTC. Do not infer hardware failure merely because one charging mode works, and do not order the former charger, 12-volt battery, relay, meter or portable EVSE from this card.
Owner tips & cautions
- TipBring the failed station, date and charging mode to the diagnosis and ask for the J1050 software level and full DTC list before authorizing hardware.
Sources for this issue (1)
P31E7 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P31E7 mean on a Audi?
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. On Audi it is documented across 1 model: e-tron.
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The most common causes of P31E7 are: Outdated onboard-charger software (level 0070) generating a false open-circuit detection - Audi TSB 2061788, Damaged or worn AC charging cable / portable charger unit,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 on a Audi?
Repair costs vary widely with the root cause and Audi model; each issue on this page carries its own estimate where one is published.
Looking for P31E7 on a different make?
View P31E7 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.