Possible Causes
| Possible Causes |
|---|
| CAN C BUS CIRCUIT OPEN OR SHORTED |
| FRONT CONTROL MODULE (FCM) |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .
The A/C Pressure Transducer signal is a direct input to the FCM. The FCM sends the PCM the A/C pressure signal over the CAN C bus.