Automatic Transmission Communication
Table of contents
P1605 INFINITI Possible Causes
- Weak battery
- Faulty Transmission Control Module (TCM)
- Harness is open or shorted between TCM and Engine Control Module (ECM)
- Poor circuit electrical connection between TCM and ECM
How do I fix code P1605 INFINITI?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Tech Notes
- There is a Factory Service Bulletin for the 2001 Infiniti I30.
- 2001 Infiniti I30 Factory Service Bulletin OBDII Code P1605
Cost of diagnosing the P1605 INFINITI code
The cost of diagnosing the P1605 INFINITI code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1605 INFINITI Description
The malfunction information related to Automatic Transmission is transferred through the line circuit from the Transmission Control Module (TCM) to Engine Control Module (ECM). The Diagnostic Trouble Code (DTC) will set when an incorrect signal from the Transmission Control Module is sent to Engine Control Module.