Speedometer

The IPC displays the vehicle speed based on the information from the vehicle speed sensor. The IPC receives a class 2 message from the PCM indicating the vehicle speed. The IPC calculates the vehicle speed based on the class 2 message indicating the wheel reference speed from the EBCM if:
^ The PCM detects a malfunction in the vehicle speed sensor circuit.
^ The IPC detects a loss of class 2 communications with the PCM.

The speedometer defaults to 0 km/h (0 mph) if the IPC detects a loss of class 2 communications with both the PCM and the EBCM.