P0669 Code - PCM/ECM/TCM Internal Temperature Sensor 'A' Circuit Low

What Does P0669 Mean?

The control module associated with temperature function within an engine has, as a part of its function, the ability to alert the vehicle driver to any possible serious internal problems. This is signaled to the PCM, ECM, or TCM via voltage readings from the internal temperature sensor. When these voltage readings exceed manufacturer specifications, a P0669 trouble code is stored and the Check Engine Light illuminates.

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What are the common causes of P0669 ?

Far and away, the most common cause of this code being stored is a defective control module. Shorted wiring has also been known to contribute to this code being stored, in extreme and rare scenarios.



How do you troubleshoot P0669 ?

The original multi-displacement system turned off opposite pairs of cylinders, allowing the engine to have three different configurations and displacements. P0669 code had an elaborate diagnostics procedure, including showing engine trouble codes on the air conditionning display. However, the system was troublesome, misunderstood by customers, and a rash of unpredictable failures led to the technology being quickly retired.

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