Engine-Codes - Generic - P0666

P0666 Code - PCM/ECM/TCM Internal Temperature Sensor 'A' Circuit

- Code Popularity: 8,623 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
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What are the Possible Causes of the DTC P0666?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Obstructions in the airflow of the radiator or transmission cooler
  • Kinked or damaged transmission fluid lines
  • Damage to the transmission cooler
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How to Fix the DTC P0666?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P0666 code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

What Does the P0666 Code Mean?

The control solenoid (w/body and TCM) valve assembly has a built-in TCM temperature sensor to detect possible overtemperature conditions of the Transmission Control Module (TCM). This fault indicates the TCM is in an overtemperature condition and the TCM has shut down to protect from possible heat damage to the TCM. TCM will remain off until the over temperature condition no longer exists.

P0666 Code - PCM/ECM/TCM Internal Temperature Sensor 'A' Circuit

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