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Replacing PCM... issues with sentry key system?

Talyn

Talyn

NAXJA Forum User
Location
Radford, Communistwealth of Virginia
I am replacing my PCM with with a used one. Will there be any problems with the sentry key system and the new PCM? Also, what about programing the VIN into the new PCM? Is that necessary?

This is on my 2000 XJ
 
Just found the answer. It won't work with out dealer programming. There is a secret key code stored in the PCM and Sentry key module along with the sentry key module looking for the correct VIN. So the Sentry key module isn't finding either and telling it to shut down.

What a worthless system.
 
You sure you couldn't find out what wire(s) in the pcm harness needs to be grounded or fed voltage to disable?
 
Once the PCM sees the sentry key system it can't be disabled. Its actually not a single wire. It communicates with the PCM over the CCD bus.

The dealer that I use lost its Jeep franchise, and while they have the DRB tool they can't communicate with Chrysler to actually reprogram the PCM. So, instead of driving 3 minutes on and engine that wants to shut off and/or hesitate I get to drive an hour to the closest Jeep dealer. There is a closer Chrysler dealer, but he gave me BS about the PCMs only able to be programed once. Basically he wanted to sell me a new PCM for $600.
 
Last edited:
Might be a good idea soon to get a back-up PCM and get it programmed for your VIN while there still are a few dealerships left. We are gonna be screwed if they go under. Better start studying electronics.
 
Now I am not sure if it can even work 100% with my Jeep. Google gives me conflicting results. Some say I need a PCM from a vehicle with 100% same options as mine has, not just the same PCM part number and that it can't be programmed otherwise. I.e. ABS, Sentry Key, auto, 4.0l, cali emissions.
 
It seems like each option would need a different part number then. The only differences I see are engine, trans, and emissions package.

EP0=2.5L Engine
ER0=4.0L Engine
EN0=4Cylinder Turbo Engine
DG0=Automatic Transmission
DBB=Manual Transmission 5 Speed
1 MODULE, Powertrain Control
#56041 632AD 1 ER0 DBB 4.0L Engine w/Export Emission
#56041 663AD 1 EP0 DBB 2.5L Engine w/Export Emission
#56041 664AD 1 EP0 DBB 2.5L Engine w/Leaded Fuel
Emission
#56041 665AD 1 EP0 DG0 2.5L Engine w/Federal Emission
#56041 666AD 1 EP0 DG0 2.5L Engine w/Califonia Emission
#56041 667AD 1 ER0 DBB 4.0L Engine w/Federal Emission
#56041 668AD 1 ER0 DBB 4.0L Engine w/California Emission
#56041 672AD 1 ER0 DBB 4.0L Engine w/European III
Emission
#56041 673AD 1 ER0 DG0 4.0L Engine w/European III
Emission
#56041 633AD 1 ER0 DBB 4.0L Engine w/Leaded Fuel
Emission
#56041 634AE 1 ER0 DG0 4.0L Engine w/Federal Emission
#56041 635AE 1 ER0 DG0 4.0L Engine w/California Emission
#56041 636AD 1 ER0 DG0 4.0L Engine w/Export Emission
#56041 639AD 1 ER0 DG0 4.0L Engine w/Leaded Fuel
Emission
#56041 640AB 1 EN0 DBB Diesel Engine
#56041 661AD 1 EP0 DBB 2.5L Engine w/Federal Emission​
#56041 662AD 1 EP0 DBB 2.5L Engine w/California Emission
 
I'm not sure on this, but a lot of auto companies go by the convention that parts with the same last letter can be interchanged. When the next to last digit changes, that may no longer be the case. Sometimes the last letter is even just a supplier change that does not affect the part.
 
Figured I'd update this for future searches. The reprogramming took with out issue. From what I have found you need to match your model year range (in my case it was 99-01), your engine, your transmission, and emissions package. I don't think ABS matters, nor does sentry key. In my case I played it safe and got the same part number PCM.
 
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