Possible Causes
| Possible Causes |
|---|
| (F891) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND OR OPEN |
| (C18) A/C PRESSURE TRANSDUCER SIGNAL CIRCUIT SHORTED TO GROUND |
| A/C PRESSURE TRANSDUCER |
| TOTALLY INTEGRATED POWER MODULE (TIPM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure