PCM Signal Ground Wire (black/Lt Blue) - Dodge Cummins Diesel Forum
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post #1 of 4 (permalink) Old 01-12-2020, 11:29 AM Thread Starter
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PCM Signal Ground Wire (black/Lt Blue)

So the #4 pin in the black PCM connector is missing. this is the signal ground wire. My question is: Is this 'only' a clean ground output for the associated sensors/solenoids, or is this pin mandatory for the PCM to function correctly?

I know its high hopes, but i'm wondering if I can get away with simply grounding the wire.




this is for a 99 24v 2500....not the 2010 in my sig


2010 2500 H&S XRT w/od, MP-8, K&N Intake 5" Turbo back

Last edited by raymie; 01-12-2020 at 11:30 AM. Reason: sig reference
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post #2 of 4 (permalink) Old 01-15-2020, 06:34 PM Thread Starter
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Anyone?

2010 2500 H&S XRT w/od, MP-8, K&N Intake 5" Turbo back
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post #3 of 4 (permalink) Old 01-15-2020, 11:35 PM
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There is probably more than one ground in the PCM If it is the one for the alternator regulation is regulated resistance. If it is that ground and the truck has an external regulator installed it is no longer needed. See Mopar1973man website for schematics. Do not know why any pin would be missing otherwise. Even then I do not know why anybody would take it out.

99 2500, Quad cab, 4x4 47RE, BD pressure lock on it, small BD 90/140 chip on the VP 44 connection plug, 17" 3rd gen wheels. 3.55 diffs. Ruenell front bumper and warn winch, Rancho adj shocks. 663k miles.
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post #4 of 4 (permalink) Old 01-16-2020, 06:51 AM Thread Starter
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Yeah I don’t think anyone took it out, it fell out, I can hear it rattling around inside the pcm.

It is the signal ground wire, not the alternator reference or either of the battery (-) wires(black/tan),,. It’s the black/light blue...

I’m just wondering if it is possible to ground it elsewhere.

Thanks for the reply though

2010 2500 H&S XRT w/od, MP-8, K&N Intake 5" Turbo back
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