AFM DOD Delete Disable Tuning Service for Chevrolet 5.3L Trailblazer Envoy Hummer E67 ECUHaving trouble with your GM AFM DOD equipped vehicle? If you plan on deleting this problem from your engine, you must reprogram your ECU. No need to permanently install any attachments, such as the Range AFM Disabler, into your OBDII port. The tuning we provide will permanently delete AFM DOD within your ECU. With your battery disconnected, remove your factory ECU from inside the engine compartment. This is very simple to do and will not require any