2008 Grand Cherokee

Danny Diagnostician Wisconsin Posted   Latest   Edited  
Resolved
Programming
2008 Jeep Grand Cherokee Laredo 3.0L (M) 5-spd (545RFE)

I need advice about how to install a used pcm in this jeep. Do i need to go thru Witech or is there a way to rewrite the vin and reset the skim? The used pcm has almost the same calibration in it, so i wouldn't need to reflash it.

I have a Cardaq3+ and the j2534 tool box software from drew tech has a vin rewrite feature and skim reset function, i'm just not sure if it will work on this 2008 jeep.

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Michael Owner/Technician
Michigan
Michael
 

I have done it with snap on zues and autel. Just replaced pcm and rewrite correct vin never even had to do skim reset after the vin was corrected.

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Danny Diagnostician
Wisconsin
Danny
 

I have the use of an Autel Ultra. The vin rewrite on that tool said it was only for writing new pcm's I had called drew tech help and was told i maybe able to do it, unless its a can bus car.

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Danny Diagnostician
Wisconsin
Danny
 

You did it on a 2008 grand Cherokee?

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Michael Owner/Technician
Michigan
Michael
 

Yes i have also done it on a few 2010 recently as a new pcm was not available. If you do need the 4 digit pin code you can easily pull it with chrysler pin pull app for android and a generic elm327 dlc connector. I have used it many times. It does cost tokens but they are cheap.

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Mario Owner
California
Mario
 

Vin needs to be rewritten. Can be done with Autel or toolbox software that comes with Cardaq. Good Luck!

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Danny Diagnostician
Wisconsin
Danny
 

Thanks Guys I will go ahead and give it a try. I was just i little nervous about it because drewtech was iffy on if it was possible and i couldn't find and videos of guys doing anything newer than a 2004 jeep. any problem with the skim module seeing the wrong vin before it gets rewrote?

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Michael Owner/Technician
Michigan
Michael
 

Mine would not crank untill i wrote the correct vin. Then it was off and running with no issues. The local dealer said a used one could not be done but i tried anyway with no issues

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Danny Diagnostician
Wisconsin
Danny
 

Thanks! did it have a regular cut key or the plastic fob type key?

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Michael Owner/Technician
Michigan
Michael
 

Mine had a can 4 fob style key with win. Plastic key

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Danny Diagnostician
Wisconsin
Danny
 

same here

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Matthew Technician
Nova Scotia
Matthew
 

I remember doing a used PCM on a 08 Nitro, I think I needed the 4 digit Skim code but was able to do everything else after getting that code with with my Autel.

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Saul Owner
Texas
Saul
 

Write it with your Autel there is no problem at all, once you write the original vin to the used pcm you are all set, nothing else needs to be done but turn car on and charge your customer!

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Mike Owner/Technician
Ontario
Mike
   

You do not need to reset the skim. Use toolbox to change the vin. That is all that is needed. Install, turn key on for a few seconds to let skim code transfer. Turn off, then you can start the Jeep. Providing the replacement PCM is good, the Jeep will start and run normally. This is true if you bench program it. I am not sure if it will work when installed in the vehicle. If it doesn't work…

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Danny Diagnostician
Wisconsin
Danny
 

I tried installing the pcm today and disconnected the skim module first, but the skim module disconnected i couldn't power on the jeep. It has this type of key system

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Jason Owner/Technician
Virginia
Jason
 

You dont need to unhook anything, install used pcm and simply re-write the vin. Only if the calibration is wrong then you'd have to re-flash it with j2534. I still use the old chrysler aftermarket software to do everything up to about 2012.

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Kerry Mobile Technician
Ohio
Kerry
 

Jason, what software are you referring to?

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Jason Owner/Technician
Virginia
Jason
 

Just the old chrysler j2534 flash application.

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Jason Owner/Technician
Virginia
Jason
 

All you need to do is buy a pcm with same part number and correct the vin

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Danny Diagnostician
Wisconsin
Danny
 

Thanks I have the same part number pcm and the calibration is the same as the original also, so just a vin rewrite and done. will do it tomorrow

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James Owner/Technician
Massachusetts
James
 

I always did Chryslers with a scan tool as long as I had the 4 digit pin. If you go to the WCM you will see an option for PCM replacement. Then enter the pin and it will program the PCM and write the VIN. Most parts departments will give you the PIN. The reset skim with the tool box only works on non can.

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Danny Diagnostician
Wisconsin
Danny Resolution
 

Rewriting the vin went off without a hitch! Thats for the help!!!

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