*We cannot tune over an existing tune, if your ECU/PCM was previously tuned it will need to be reverted back to factory before a new tune can be used.*
*For all models above 2018, please do not remove the DEF tank as the bench flash tunes will NOT support this delete at this time.*
Before removing your ECM take note of any maintenance or engine lights on the dash.
You should have no errors before removing the ECM. If you have a DEF/DPF countdown issues prior to tuning, those should be cleared. Since those are transmitted by the SCR module it will stay in the cluster and an ECU tune unfortunately does not typically clear those codes.
Be sure your codes are all cleared before you remove the ECM.
Clear the codes using a code reader/clearer
1- Clear all codes.
2- Turn the key to the off position.
3- Remove the negative cable from the battery.
4- Remove ECM.