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J1850

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Old 02-16-2017, 09:44 PM
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Wondering if anyone can point me in the right direction. Check engine light is on what comes up is j1850 no transmission, also no cluster messages, wrong VIN/ mismatch. Any help would be appreciated. Thanks
 
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Old 02-16-2017, 11:19 PM
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Did you change the PCM?
 
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Old 02-16-2017, 11:35 PM
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No I didn't change pcm. Should I? Bad ground? Short somewhere?
 
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Old 02-17-2017, 09:40 AM
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What year? What engine?
 
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Old 02-17-2017, 03:41 PM
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2004 5.7 automatic 4x4
 
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Old 02-17-2017, 07:26 PM
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Usually the mismatch shows up after a pcm change, because the pcm was flashed incorrectly.


Battery good? All fuses and relays good?
 
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Old 02-17-2017, 08:20 PM
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Yes battery is good and I switched relays around, I didn't test them. The only thing I have done was try to download a supercharger tuner a couple weeks ago...It said it already had a tune of some sort...360$ gone
 
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Old 02-17-2017, 09:01 PM
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Try to use the tuner to return to stock. You can't load multiple tunes. This maybe the cause of the mismatch code, and the others.
 
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Old 02-17-2017, 09:31 PM
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Super chips
 
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Old 02-17-2017, 09:41 PM
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Truck came with a tune idk what one...My tuner won't let me download cuz it says not stock file. Reset PCM?
 
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