1998 Chevy Cheyenne Replacing Computer

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Computer problem
1998 Chevy Cheyenne V8 Four Wheel Drive Manual 155000 miles

I recently took my truck to my dealer to have them give me the codes from the computer because I was having some pretty bad misfiring problems. They told me my computer was bad. So instead of buying a new computer I bought and installed a used one. Now the truck will crank for a few seconds and then quit. I was wondering if there was something that I was supposed to do to make the computer work or if maybe the aftermarket alarm was causing some problems somehow?

Do you
have the same problem?
Friday, January 2nd, 2009 AT 1:21 PM

1 Reply

  • 3,149 POSTS

Hello -

After your review I think you will see it needs to be programmed.

I used the model, K1500 PU, 4WD, 5.0L VIN M

If you feel you need more info please provide your specific model and engine size in liter and 8th digit of your VIN.

Vehicle Control Module (VCM) Replacement/Programming

CAUTION: In order to prevent possible electrostatic discharge (ESD) damage to the VCM, do not touch the connector pins or soldered components on the circuit board.

" To prevent internal VCM damage, the ignition must be turned OFF before disconnecting or reconnecting power to the VCM (for example, battery cable, VCM fuse, jumper cables, etc.).
" When replacing the production VCM with a service VCM (controller), it is important to transfer the broadcast code and production VCM number to the service VCM label. This will allow positive identification of VCM parts throughout the service life of the vehicle.
" Service of the VCM consists of either replacement of the VCM or reprogramming of the VCM. If the diagnostics call for replacement of the VCM, it will be necessary to transfer the Electronic Spark Control Module (PROM) and program the VCM using the procedure in this section.
" The PROM / Electronic Spark Control Module must be transferred to the replacement VCM.
" Do not remove the cover of the PROM. Use of an unapproved PROM removal method may cause damage to the PROM or the socket.
" The replacement VCM must be programmed before the vehicle will run.
" The replacement VCM must also have the VTD Password Learn Procedure completed before the vehicle will run.
" The replacement VCM must also have the CKP System Variation Learn Procedure completed. If this procedure is not completed a DTC P1336 will set.

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Friday, January 2nd, 2009 AT 10:27 PM

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