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P1605 – Infiniti DTC

Infiniti DTC P1605 – A/T Diagnosis Communication Line

DTC P1605 meaning on Infiniti

  1. DTC P1605 on an Infiniti refers to a fault in the Automatic Transmission (A/T) diagnosis communication line.
  2. This fault indicates a communication issue between the Engine Control Module (ECM) and the Transmission Control Module (TCM).

Infiniti DTC P1605 symptoms

  • Check Engine Light (CEL) illuminated on the dashboard.
  • Transmission may go into “limp mode” or exhibit erratic shifting behavior.
  • Vehicle may experience a decrease in fuel efficiency.

Infiniti DTC P1605 causes

  • Corroded or damaged wiring in the communication line between the ECM and TCM.
  • Loose or poor connections in the communication circuit.
  • A faulty ECM or TCM.

Infiniti DTC P1605 seriousness

  1. While the vehicle may still be operable with this fault, it is important to address it promptly to prevent further damage.
  2. Continued driving with this issue may lead to more severe transmission problems.

How to diagnose DTC P1605 on Infiniti

  1. Use a diagnostic scanner to retrieve the specific fault code (P1605).
  2. Inspect the wiring harness and connectors for any visible damage or corrosion.
  3. Perform a continuity test on the communication line between the ECM and TCM.

How to fix DTC P1605 on Infiniti

  1. Repair or replace any damaged wiring or connectors in the communication line.
  2. If necessary, replace the ECM or TCM if they are found to be faulty.
  3. Clear the fault code and test drive the vehicle to ensure the issue has been resolved.

How to erase DTC P1605 on Infiniti

  1. Use a diagnostic scanner to access the ECM and clear the fault code (P1605).
  2. Ensure the repair has been completed successfully before clearing the code.
  3. Perform a final test drive to confirm the fault code does not return.

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