DTC P1518: Loss Of Communication Between Pcm & TAC Module: Description

The Throttle Actuator Control (TAC) module and the PCM communicate via a dedicated serial data circuit. This serial data circuit is separate from any other serial data circuit on the vehicle. Accurate transmitting and receiving of serial data requires not only good circuit integrity but also adequate system voltage. This diagnostic monitors the accuracy of serial data transmitted between TAC module and PCM. If PCM or TAC module detects a loss of data or invalid data, this DTC will set.