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DTC Troubleshooting

Step	Action	Yes	No
1	DTC check Check control modules communicated by means of CAN for DTCs. Is there any CAN-DTC(s) detected?	Go to applicable DTC diag. flow. CAN DTC (LOST COMMUNICATION AND COMMUNICATION BUS OFF) TABLE	Replace combination meter and recheck DTC. If DTC P0649 is still detected, substitute a known-good ECM and recheck.