Symptoms

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

Possible Causes

- Open or shorted CKP sensor circuit condition - Poor CKP sensor electrical connection - Check communication error between the ECM and TCM - Failed CKP Sensor

When Detected

The P0728 Codes is triggered when the TCM detected that the engine speed received from the ECM is intermittent.

Description

The Engine Control Module (ECM) monitors the engine speed through the Crankshaft Position (CKP) sensor with the engine running, and send signal to the Transmission Control Module (TCM).