P1605high severityPowertrain
A/T Diagnostic Communication Line
on 2021 Nissan Leaf Electric 40kWh · FWD
What this code means
Failure in communication between ECM and TCM.
Symptoms
- CEL
- Trans stuck in failsafe
- No shifting past 2nd/3rd
- Overdrive light off
Common causes
- Blown A/T fuse
- Faulty TCM
- Damaged communication wiring
- Corroded connectors
Diagnostic steps
- Check A/T fuse
- Test communication line
- Inspect connectors
- Test TCM
Repair notes
Repair communication line or replace fuse.
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