we recently got an 98 12v and the gauges, the transmision, the A/C, the battery charging system didnt work so they told me here at a shop we needed a new PCM. so we bought a new one and they told us that it had to be reprogrammed while it was installed in the truck. so we took the truck to the dealer but now they say they cant have communication between the truck and their "computer"
so the question is if somebody could help, have had same problem or would have an idea why they cant have communication, any help would be appreciated
thanks a lot
alfredo

 

Just a thought

did you get one using the serial number of the truck? If not then that might be your problem. If it was given a serial number that it should not have been given, or it got crossed it probably couldnt be programmed. My truck when i got the PCM was programed there at the dealership, with the VIN of the truck, when i got the truck, everything worked as it should...

I dont know what else it could be, but im guessing that is what it is..

Rick

 

When they say no communication to the PCM it usually means a bad connection.
Quite common for the female connectors on the PCM connector to get stretched out and make poor contact. The connector can be taken apart and the connectors squeezed tighter.
My local dealer said the entire vehicle had to be brought in to have the PCM reprogrammed. Turned out they removed the PCM and took it a few blocks down the street for Cummins to reflash it.

 

yeah, we ordered a new PCM, with the serial number (vin) of the truck.


infidel:


that sounds like a problem! ill try to check that out! thanks a lot

 

Sounds like the speed sen. is bad not the PCM

 

do you mean the sensor, on the front of the engine, wish tells the rpm's?
they couldnt get the comunication to thepcm, cuz that sensor was burnt, and not workin!

well that was it!

found the problem!!

we bought the new pcm for 450 dls plus the programing and finding out the sensor was bad - $90 at the dealer. plus an used sensor for a bit under $100

and then it didnt take the overdrive, cuz sumthin at the tranny came wrong assemblied, fixed that at another shop, now everything works fine.

except the heater. probably has nuttin 2 do with it!

thanks for all your inf guys!