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When having one of these devices OR SIMILAR OR ANY AFTERMARKET WIRING DEVICE installed our customers have found writing can be interrupted when your vehicle is equipped with one of these devices due to it talking on the bus when it shouldn't be.
Under normal circumstances you'll find this out via write calibration only which won't harm the ecm
However if you are doing a write entire the first time you are writing to a vehicle you could potentially hurt the ecm.
Make sure to remove this device or flashing your ecm/tcm modules via bench harness.