Re-Flashing the ECM

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Sep 19, 2013 | 09:26 PM

troc47

Thread Starter

Newbie

Joined: Sep 2013

Posts: 2

Likes: 0

Model: Cherokee

Re-Flashing the ECM

bought a used ecm for my 99 grand cherokee . I need to know how to reprogram it to fit my g cherokee

Sep 19, 2013 | 11:28 PM

austinjoe13

CF Veteran

Joined: Nov 2011

Posts: 2,433

Likes: 6

From: Northern MN

Year: 1990

Model: Cherokee (XJ)

Engine: Renix 4.0

Quote:

Originally Posted by troc47

bought a used ecm for my 99 grand cherokee . I need to know how to reprogram it to fit my g cherokee

you can't reprogram a mopar computer

Sep 20, 2013 | 05:10 AM

Willys55

Caracticus Potts The Mod

Joined: Jul 2009

Posts: 5,298

Likes: 9

From: Hainsville, NJ

Model: Grand Cherokee

We have had a few "re-programmed" by the dealer, their software can do it. We have the Snap-on Pass Thru Pro which can only program "new" ECM/PCM.

Inquire with your dealer, a phone call won't kill you.

Sep 21, 2013 | 03:18 PM

dave1123

Old fart with a wrench

Joined: Nov 2010

Posts: 14,398

Likes: 740

From: Manlius, east of Syracuse, NY

Year: 2000 XJ Sport & WJ Laredo

Model: Grand Cherokee (WJ)

Engine: 4.0L

I know in GM computers, there is a PROM chip that is set up with memory for that particular type and model vehicle. I believe Mopar computers are preprogrammed on the production line and can only be redone at a dealership. I'm only quessing, because nobody has ever said anything about a PROM in a Jeep.