My truck has lost ability to rush. Have no communication to ALDL connector, no check engine light. Will crank over, no security light. Drive select indicator comes on for about 1 second showing 4 wheel drive, then goes off. When moving 4 wheel drive switch can hear transfer case motor running. Testing has determined most or all 5 volt supply voltages gone. I'm at the point I need to check power and ground inputs to ECM. Difficult process. Is there a trick to removing plastic cover from ECM connectors so I can check for power and grounds at ECM?
Jul 20, 2026 at 5:06 PM
