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Exactly as the title states, RunVSE has released emissions compliant tuning for the LM2 Duramax in the Sierra and Silverado platform (pre-refresh).
2015 Silverado no crank no start with key. (have engine light on dash and also have u422) have replaced starter and battery. have 12.5 volts at the starter. checked 2amp fuse in dash for ignition switch, checked under the hood 15amp fuse that powers the ignition switch, checked the 60 amp fuse in fuse box. also checked the 40 amp fuse, checked starter relay in fuse box under hood. tried jumping starter relay post and got nothing. have 12.5 volts at power leg of starter relay, have ground on ground leg of relay. can jump starter solenoid with screw driver and truck runs and drives.
gear shift selection shows park when in it and neutral. Anybody have any ideas of what could be going on?
By Brad Ashley
I had the original motor completely rebuilt and when put back into my truck it will start and run but once you shut it off it will only crank but not start. Usually a hour later it will start again. . Any help I would appreciate it.
Hello , new to the group thanks so sorry if I’m posting to wrong group or if question has been asked before. My issue is that I bought a ‘15 1500 WT 5.3L that had around 350k with lazy #7 cylinder. So I bought used motor with around 100k from a ‘15 gmc 1500. Swapped motors out and when I went to start up I don’t get any crank, No gauges work, service error lights all come on. I’ve checked to make sure grounds are clean and tight, checked fuses inside cab and in engine bay, battery tests good, getting codes U0100 and U0102 and I’ve also installed new:
-Engine Harness (found some splits on harness that came with motor so bought new one)
-Computer (also have the original and one that came with the motor and I’ve tried swapping all 3 to see if that worked)
-Relay panel in engine compartment
Just seeing if anyone has any fix’s or tricks. Thanks
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