P0666 OBD II Trouble Code PCM/ECM/TCM Internal Temperature Sensor Circuit
How to easily troubleshoot and repair, and causes of a P0666 trouble code which indicates a detected internal temp sensor circuit fault in a PCM, ECM, or TCM module.
Symptoms of P0666 OBD II Trouble Code
Engine will not start
Engine may stall
Transmission warning lamp illuminated
Check engine light illuminated
Common Causes of P0666 OBD II Trouble Code
Corroded or damaged connector
Loose or defective control module ground strap
Faulty or damaged wiring
Defective PCM, ECM, or TCM
Severity of P0666 OBD II Trouble Code
The severity of this code can vary tremendously from just an illuminated check engine light or a transmission warning lamp on a vehicle that starts and runs to an automobile that will stall or not start at all. The code can be serious depending on the specific nature of the problem.
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