OBD2 CODE

P31E7 Engine and transmission (P)

We do not have a full sheet for this code yet, with its causes and checks. What you see here comes from the OBD2 code standard.

System: Engine and transmission (P)
Code type: Manufacturer-specific code: its exact meaning depends on the make.

What do I do now?

If the engine light flashes, the car loses a lot of power, overheats or the brakes fail, stop somewhere safe and call for assistance.
If the car drives normally, book a garage and show them this code: its exact meaning and the cause depend on each model.
Tell us what you notice: the diagnosis takes the code, your car and the symptoms into account.

This code does not point to the engine, the brakes or the transmission: you will see the X-ray car with no area marked.

The car will not start with codes P31E7 and P0AA6 because of a battery module with a bent retention plate (Leaf e+ 62 kWh)High-voltage battery

Engine / equipment: 62 kWh lithium-ion battery modules: Nissan Leaf (ZE1) e+
Period mentioned: 2019–2025
Symptoms: The car does not start and has codes P31E7 (restart inhibition) and P0AA6 (high-voltage system isolation) stored.
Possible cause described: According to Nissan bulletin NTB23-024A (USA, May 2024) for the 2019–2025 Leaf ZE1 with the 62 kWh battery, if a battery module triggered the codes, it is inspected for a bent retention plate and, if so, the module is replaced.
Check for the garage: Do not keep trying to start it: it is a high-voltage fault. Call for assistance and have a Nissan dealer follow the bulletin’s diagnosis to see whether a battery module is the cause.
Cost cited in the source: No verified estimate; ask the garage for a quote.A rough figure from the original database, not an up-to-date quote.