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Old 11-11-2014, 12:30 AM
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My Jeep: 2005 5.7L WK2
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Re: 2005 Jeep Grand Cherokee (Electronic Throttle Control ) problem

I hope your new ECM worked out. Since my last post I also bought a bargain "remanufactured" ECM on the internet for $200 with 1 year warranty (I'm so clever). It seemed OK for a week and died again. Exercised the warranty, and to my surprise they were very helpful. Unfortunately, the 2nd unit only lasted about 3 days.
I went to O'Reilly Auto and they said they could get remanufactured for about $480 from Cardone. Went home and researched Cardone and was very impressed with the thorough description they provided of their complete tear down, clean and test process. Just for fun I took $200 unit #2 out of my Jeep and pulled the cover off. My bargain source had scratched through a very small hole in the OEM conformal coat to replace (or maybe resolder) one bad component and then closed it up without even repairing the conformal coat. Unfortunately, Cardone did not have my unit in stock and it would take a total of about 2 weeks to send them mine for repair, so I went to the dealer and spent $750 to get a brand new one the next day. $135 programming job and I was back on the road. I wish I had spent that money first instead of piddling away all the other money.

For future trouble shooters out there: There are no smarts in the throttle body. All of the power transistors for throttle motor movement are in the ECM. It seems like the most common problem is related to weak solder joints or weak transistors. Mine would fail and reset frequently over the course of most of the summer and I could never confidently identify a faulty component. Going to the dealer with my check book open for a new ECM was an act of desperation that thankfully solved the problem. If you're in the SF Bay Area, go to Normandin's. They always treat me with respect and are always good to their word.

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