DTC Troubleshooting: P0666 (0-21)
DTC P0666:
 TCM Internal Temperature Sensor Signal Malfunction
  1. Turn the ignition switch ON (II).
  1. Clear the DTCs with the HDS.
  1. Turn the ignition switch OFF.
  1. Turn the ignition switch ON (II).
  1. Check for DTCs with the HDS.
Is DTC P0666 indicated?
YES -
Substitute a known-good TCM, then recheck. If the symptom/indication goes away with a known-good TCM, replace the original TCM. ■
NO -
Intermittent failure, the system is OK at this time.■