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DTC Troubleshooting: U0404 (134-7)

DTC U0404:
 F-CAN Malfunction (TCM Received Invalid Data from Gear Shift Control Module)
  1. Turn the ignition switch to ON (II).
  1. Clear the DTCs with the HDS.
  1. Change the shift lever in all positions.
  1. Check for DTCs with the HDS.
Is DTC U0404 indicated?
YES -
Substitute a known-good gear shift control module, then recheck. If the symptom/indication goes away with a known-good gear shift control module, replace the original gear shift control module.
NO -
Intermittent failure, the system is OK at this time.■