What does code P1605 mean on Infiniti vehicles?
The ECU detects a malfunction in the automatic transmission diagnostic communication line.
OBD-II Code Infiniti
P1605 — Infiniti — Automatic Transmission Diagnostic Communication Line Malfunction
The ECU detects a malfunction in the automatic transmission diagnostic communication line.
Common symptoms
- Erratic gear shifts
- transmission communication errors
Possible causes
- TCM communication fault
- wiring issues
Initial recommendation
Perform network diagnostics and inspect transmission communication lines.
Safety notice
This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine Infiniti code P1605 with your vehicle's actual symptoms for more complete diagnostic guidance.
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