5.2 and 5.9 PCM Swapable?
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Captain
Joined: Feb 2011
Posts: 542
Likes: 2
From: Ohio
They both exchange information through the CCD bus which is the only data bus in the entire vehicle, it's just a 2 wire twisted pair multiplexed bus, like ethernet in a way and you need a DAC to decode any information on it.
Record Breaker
Joined: Mar 2010
Posts: 1,169
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From: Texas
Ok so if I swap a cpu out of a 99 with a 5.9l it will run my 99 with a 5.2l?
The reason I ask is the other day my sct tuner locked my ecu and now I cant change tunes or even restore the factory tune.
Please help
The reason I ask is the other day my sct tuner locked my ecu and now I cant change tunes or even restore the factory tune.
Please help
Record Breaker
Joined: Jun 2011
Posts: 2,387
Likes: 41
From: Bismarck, ND
When I had my ABS module removed from the vehicle I could drive it but the odometer was not counting and the speedometer was at 0. Now the trans also acted funny when slowing down, in fact sometimes would stall the truck unless the throttle was touched when coming to a stop. Hope this answer some questions.
Veteran
Joined: Feb 2011
Posts: 425
Likes: 2
From: New york
in the newer models with 4 wheel abs the abc module controls the speedo. in the rwd ams systems the speedo uses a speed sensor that rides on the output shaft of the tcase.
the abs module being unpluged may have put the trans in limp mode causing your funny shifting and stalling issue. i believe if you have traction control or auto 4x4 its also controlled by the abs module. but dont quote me on that because i havent dealt with in the gen 1s i know the gen 2 and 3 are deffently run that way so id assume its the same.
the abs module being unpluged may have put the trans in limp mode causing your funny shifting and stalling issue. i believe if you have traction control or auto 4x4 its also controlled by the abs module. but dont quote me on that because i havent dealt with in the gen 1s i know the gen 2 and 3 are deffently run that way so id assume its the same.
Registered User
Joined: Feb 2016
Posts: 3
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If you use the same type 1998-1999 5.9L to 5.9L they should work just fine. Same with 2000-2002 and I think 2003 but unsure. You can also swap a 5.2L PCM from the match years I just posted into a 5.9L and it's going to run, just not to its full potential. You can swap a 5.9L PCM (again using the match years I provided) into a 5.2L, with a boast of more performance (but haven't had anyone test this theory yet).
A 4.7L must be swapped with its exact match because of the 16 and 32 bit systems.
Anyway, I have seen this done a few times as the VIN doesn’t have to match. She should fire. The instrument cluster holds the mileage not the PCM. The reason for it to be flashed is the 5.2L and 5.9L are the same PCM only with a little difference in flash. There are other differences from what I've seen in the earlier years to later years 5.9L (as indicated above in the years) so the newer and later years are not swappable without a flash, in fact I would think they are completely different PCM's.
Now I have everyone confussed, better go to work now........
A 4.7L must be swapped with its exact match because of the 16 and 32 bit systems.
Anyway, I have seen this done a few times as the VIN doesn’t have to match. She should fire. The instrument cluster holds the mileage not the PCM. The reason for it to be flashed is the 5.2L and 5.9L are the same PCM only with a little difference in flash. There are other differences from what I've seen in the earlier years to later years 5.9L (as indicated above in the years) so the newer and later years are not swappable without a flash, in fact I would think they are completely different PCM's.
Now I have everyone confussed, better go to work now........
Computer Will not work if I get 99 5.7 and put it in a 98 5.2??
Registered User
Joined: Feb 2016
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Yes it's a 99 dodge ram 1500 5.9 my friends has one for parts and told me if I need the computer off of it to take it but mine is a 98 Dodge ram 1500 5.2 just want to make sure it will work with if k ot no point in swapping and gonna run my truck, it's just turning off on me while running and had the battery, and alternator and the 2 came back to me as good so next they told me it could be the voltage regulator that's in the computer so I wanted to try it and see what happens but only if it's not gonna be bad for my truck??