Possible Cause

NOTE:  The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

DTC: P0117 

• ECT sensor 1 TW line short to ground

DTC: P0118 

• ECT sensor 1 TW line open
• ECT sensor 1 TW line short to power
• ECT sensor 1 SG2 line open

Common 

• ECT sensor 1 failure
• PCM internal circuit failure