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P0117 – Engine Coolant Temperature (ECT) Circuit Low Input

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P0117 – Engine Coolant Temperature (ECT) Circuit Low Input


Indicates the sensor
signal is less than Self-Test minimum. The ECT sensor minimum is 0.2 volts or 121°C (250°F).
Note on some vehicles that are not equipped with an ECT sensor, CHT can be used and can set this DTC.

Possible Causes

● ● Grounded circuit in
● Damaged sensor
● Improper harness connection
● Damaged PCM

Diagnostic Aides

■ Using signal simulation,
disconnect sensor and simulate 1.0V on sensor signal circuit. Simulated 1.0V signal and scan PID voltage value should be similar. If voltage is similar check sensor, if voltage is not similar check related circuit and PCM.


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