Got a customer with an '01 duramax, went to read the calibration out of the ECM, initialized to step 2, then mesage "not ready waiting 1 second..." repeatedly. initialized to step 4 then I get a bootloader rejected error after the message that the ECM has "re-armed" after which the truck will not start. Acts like the VATS is active. the truck does start after either removing all the ECM and IGN related fuses or disconnecting the batteries for a period of time.
Customer states that he belives this is due to an ECM update done at the dealership in which they "fried" a certain chip within the ECM to make it non-programmable...I don't buy that. Anyone have any suggestions? I've never had a reading flash cause a no start condition before...