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How to Reset Diagnostics Codes in a Chevy Tahoe
- 1). Locate the diagnostics port near the fuse panel on the underside of the driver-side dashboard. This port should be the same shape and size as the connector on the OBD scan tool. Plug the OBD scan tool into this port, taking care not to push too hard because this could bend the pins inside the plug.
- 2). Put the key into the ignition and turn it to the "on" position, but don't start the engine. This will power on the scan tool.
- 3). Wait while the scanner reads the codes. Look for a command on the scanner that says "delete" or some similar command and select it. This will erase the codes and reset the computer.
- 4). Unplug the scan tool and start the engine. Verify on the instrument panel that all warning and service lights have shut off.