The way to Reset a GM PCM 1Shift the vehicle's transmission into park or first gear. Shut down the engine and set the parking brake car diagnostic software. Rotate the ignition back to the "On" position but do not begin the engine.2Plug the scan tool's data cable into the vehicle's diagnostic information port, located underneath the dashboard on the driver's side.
3Turn on the scan tool and allow it to boot up. Comply with the on-screen instructions to enter inside the vehicle's particular drivetrain information and facts.4Select "PCM" from the scan tool's major menu. Pick out "codes," then select "clear all existing and stored DTCs."
DTC is an acronym from diagnostic trouble code.5Wait for the scan tool to confirm that the codes happen to be cleared. Disconnect the scan tool from the vehicle and start out the engine Auto diagnostics. Confirm that no MILs are illuminated within the gauge cluster. The PCM is now reset.
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