Possible Causes
- CHECK PCM POWERS AND GROUNDS
- SCI TRANSMIT CIRCUIT SHORTED TO VOLTAGE
- SCI RECEIVE CIRCUIT SHORTED TO VOLTAGE
- SCI CIRCUITS SHORTED TOGETHER
- SCI TRANSMIT CIRCUIT SHORTED TO GROUND
- SCI RECEIVE CIRCUIT SHORTED TO GROUND
- SCI RECEIVE CIRCUIT OPEN
- SCI TRANSMIT CIRCUIT OPEN
- POWERTRAIN CONTROL MODULE