PCM need to be programmed?

Tiny
DNJFUN13
  • MEMBER
  • 1996 DODGE RAM
  • 190,000 MILES
Replaced fuel pump, crankshaft sensor, new plugs and wires. No start. Put in a PCM from another dodge truck. Ran for 30 min until I put it in gear. Put back the original PCM and now no fuel or spark. Does PCM need to be programmed for that specific model or can I just buy a new one and put it in? I pondering if it’s the PCM or if it could be something else
Wednesday, April 22nd, 2026 AT 10:34 AM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 34,490 POSTS
What's the rest of the story with the replacement computer? Any time power is lost to it, meaning disconnecting the battery or the computer, you have to do a relearn for "minimum throttle". Until that is done, idle speed will be too low. Common symptoms are the engine will tend to stall at stop signs, and it may not start unless you hold the accelerator pedal down 1/4". You also won't get the nice idle flare-up to 1500 rpm at start-up.

Minimum throttle is the only learned thing that doesn't occur on its own. You have to drive at highway speed with the engine warmed up, then coast for at least seven seconds without touching the pedals.
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Wednesday, April 22nd, 2026 AT 12:20 PM

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