With Generic Scan Tool

IMPORTANT: Using the scan tool to clear DTCs clears both the TCM and the ECM DTCs, regardless of which system is being diagnosed.

DO NOT clear DTCs unless instructed to do so by a diagnostic procedure.

Clearing the DTCs also clears the ECM's Freeze Frame data. Several TCM DTCs cause a MIL request signal to be sent to the ECM. The ECM will record the Freeze Frame data when a MIL Request signal is present. The scan tool has the capability to save any data that is stored in the Freeze Frame and then display that data at a later time (refer to Capture Info). This data may prove useful during transmission diagnosis. Once you correct and verify a problem, it is a good idea to clear the DTCs so that any future service work is not needlessly confused.

Many DTCs have complex test and failure conditions. Therefore, simply clearing the DTCs, exiting the diagnostics, and watching to see if the DTC sets again may not indicate whether a problem has been corrected. To verify a repair after the repair is complete, you must look up the test conditions and duplicate those conditions. Then, if the DTC does not set, chances are good that the problem is fixed.