Symptoms

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

Possible Causes

- Input shaft speed sensor circuit is open or shorted - Input shaft speed sensor poor electrical connection - Faulty input shaft speed sensor - Faulty Engine Control Module (ECM)

When Detected

P0791 code is detected when the input speed sensor voltage is more than 1.9V or less than 0.1V for 2 seconds or more