Unplugged PCM, Truck won’t start - Hemi Truck Club
 
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Old 05-21-2019, 11:03 AM   #1
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Unplugged PCM, Truck won’t start

I had my pcm unplugged for a few weeks, plugged it back in and the fuel pump won’t kick on or the starter. Dash lights up but nothing happens at the turn of the key. Plugged my diablo tuner up to it and it can’t even read a vin?????

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Old 05-21-2019, 12:19 PM   #2
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Dead battery?
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Old 05-21-2019, 02:39 PM   #3
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Dead battery?
no I had it on the charger when I hooked the tuner up
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Old 05-21-2019, 02:58 PM   #4
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Check your ASD relay and fuse.
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1# 2017 HTC FASTEST HEMI List....
Current 1/4 mile [email protected] (2018)
Current 60' PB 1.351 (2019) mechanical issue for 1/4m

HTC 2018 TOTY

Support vehicle- 2007 QC G56 4x4 diesel
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Old 05-21-2019, 03:59 PM   #5
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Check your ASD relay and fuse.
everything’s good. My old pcm still works and this one did a couple weeks ago
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Old 05-21-2019, 04:50 PM   #6
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That’s odd. Of the battery was dead and you were using a charger they don’t put a plaid voltage out and the file may have corrupted. May have to do a force tune load
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Old 05-21-2019, 04:54 PM   #7
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That’s odd. Of the battery was dead and you were using a charger they don’t put a plaid voltage out and the file may have corrupted. May have to do a force tune load
battery wasn’t dead, but I always have the charger hooked up while tuning, just on 2 amp
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Old 05-21-2019, 06:25 PM   #8
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Thats weird then for sure
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Old 05-22-2019, 07:17 PM   #9
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Quote:
Originally Posted by Waylon5.7 View Post
everything’s good. My old pcm still works and this one did a couple weeks ago
Are you saying your old pcm will start the truck but your new one won't?
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2003 RCSB, 2wd, "Pro-Street"
6.4L/cog driven V7-Ysi/46rh trans/HTH Truckarm coilover suspension. HP Tuning...

1# 2017 HTC FASTEST HEMI List....
Current 1/4 mile [email protected] (2018)
Current 60' PB 1.351 (2019) mechanical issue for 1/4m

HTC 2018 TOTY

Support vehicle- 2007 QC G56 4x4 diesel
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Old 05-23-2019, 06:06 PM   #10
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It cranks up and runs with a different pcm maybe that one was fried. But the diablo tuner cannot read a vehicle. Can’t run without a tune. Stalls out immediately with the big cam. The original 03 pcm cannot marry with the tuner either. Tuner is not messed up. It read the vin in another vehicle. Is there any wires that go from the pcm to the obd2 plug? Maybe I have a communications issue
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