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1998.5 Dodge Ram with 24valve Cummins...When swapping a bad ecm with a known working ecm, must i also swap pcm to match?

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No, but the calibration numbers on the ecm must match.In 1998 dodge still used a prom, that you need to take out of old unit and put in new unit

Posted on Dec 04, 2014

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did you use the existing ecm or the one that came on the new motor. probably need to program the wcm. transfer secret key also. sounds like the problem to me. if the vin number in the ecm/pcm/wcm dont match the truck wont stay running

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