Transmission Control System

U0402-IMPLAUSIBLE DATA RECEIVED FROM TCM (FDCM)

- When Monitored:
With the ignition on for 4 seconds, no CAN BUS circuit error condition present, no lost communication with TCM condition present, and no system undervoltage or overvoltage condition present.
- Set Condition:
The Final Drive Control Module is receiving implausible data for gear or PRNDL position from the TCM.

Possible Causes
TRANSMISSION DTCS PRESENT
FINAL DRIVE CONTROL MODULE (FDCM)

Diagnostic Test
1. TRANSMISSION DTCS PRESENT
Ignition on, engine not running.
With the scan tool, read DTCs in the Transmission Control Module.
Are there any DTCs present?
Yes >>Perform the applicable diagnostic procedure.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1 Transfer Case Verification Test
No >>Replace the Final Drive Control Module.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1 Transfer Case Verification Test