What it means
The coupler A temperature exceeds the safety threshold during charging. Contact resistance increased or charging current too high.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
The battery charger monitors temperature at coupler A while the vehicle is charging. This code sets when that coupler temperature exceeds the safety threshold, which can happen when oxidized contacts create resistance or the charging current exceeds the coupler’s rating.
Common causes
Most likely first.
- Coupler contacts oxidised - high resistance
- Charging current above coupler rating
Symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
How to diagnose it
- Stop charging and record any charge fault information; note whether the warning occurred with a particular coupler or charging setup.
- Once the coupler is safe to handle, inspect its contacts for oxidation, contamination, discoloration, or heat damage.
- Check that the coupler and charging equipment are rated for the vehicle and the charging conditions.
- If the vehicle provides coupler temperature data, compare it during a supervised charging check and look for an abnormal rise.
- Have the coupler, vehicle inlet, and charging equipment checked for contact condition and current compatibility before charging again.
Common fixes
- Clean the coupler contacts only as permitted by the vehicle and charger instructions.
- Stop using a damaged or heat-discolored coupler and replace it with a compatible one.
- Repair or replace a damaged vehicle inlet or coupler connection.
- Use charging equipment that operates within the coupler’s rating.
Can I keep driving?
Stop charging if the coupler is hot, discolored, or repeatedly triggers the warning; do not touch hot contacts or continue charging through an adapter or coupler that exceeds its rating. The fault can interrupt charging and worsen contact damage.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.