Warning About Clearing Trouble Codes

DTCs should be cleared after repairs have been completed. Some diagnostic tables will tell you to clear the codes before using the chart. This allows the PCM/ECM to set the DTC while going through the chart, which will help to find the cause of the problem more quickly.

To prevent powertrain control module (PCM)/engine control module (PCM/ECM) damage, the key must be OFF when disconnecting or reconnecting the power to the PCM/ECM (for example battery cable, PCM/ECM pigtail connector, PCM/ECM fuse, jumper cables, etc.).