Faulty 14 Volt Power Module
14 Volt Power Module harness is open or shorted
14 Volt Power Module circuit poor electrical connection
Engine Light ON (or Service Engine Soon Warning Light)
The accessory DC power control module, also referred to as the 14 V power module, constantly monitors system input and output voltage. This sensor is internal to the 14 V power module and is not serviced separately from the control module.