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Old 03-11-2019, 10:11 PM   #1 (permalink)
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2008 Rubicon DEAD- Need some input

So I was driving the other day and my Jeep started running really rough all of a sudden. It felt like a major misfire for a sec then just died completely. I popped the hood and found that a spark plug wire melted on my aftermarket headers. I disconnected the battery, replaced the severed wire and nothing. I have lights, interior functions such as radio/cb/ham, but when I turn it over I get nothing at all. Battery is fully charged and all fuses and relays are good. When I hooked up a Snap-On reader to the Jeep it isnt even connecting. Against my better judgement I have it towed to the stealership thinking I may have fried the ecu. I called to see if they had figured anything out and I got the iconic "it's not looking good" speech and that they would know more later. I promptly told the SOB that I'm not looking to get upsold on a bunch of bullshit not needed and to let me know the core source of this problem. Any input would be greatly appreciated on what could be the cause of this. They already raped my bank account when they replaced the tipm recently and I'm not looking to get screwed again.

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Old 03-12-2019, 10:27 AM   #2 (permalink)
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Why wouldn't you just reset the ECU, then test again?

The issue as I see it, is you are stupid enough to take it to the dealer and not look for a mechanic local that does work on jeeps.
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Old 03-12-2019, 10:27 AM   #3 (permalink)
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Why wouldn't you just reset the ECU, then test again?

The issue as I see it, is you are stupid enough to take it to the dealer and not look for a mechanic local that does work on jeeps.
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Old 03-13-2019, 03:11 PM   #4 (permalink)
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I did fuckhead.. I reset it 3 times and then it went to my personal mechanics shop first where he basically told me that the pcu was toast. Even if I bought the part and installed it myself it (which is pretty fucking easy) it would still need to be flashed in order for it to work in my Jeep. The last thing I want to do is deal with the fucking grimy service dudes at the dealership

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Old 03-15-2019, 05:50 AM   #5 (permalink)
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why would a new ECU need to be flashed? did your current one have a custom tune on it or something?

you said you get nothing at all when you turn it over. Does that mean it wont even turn over? or it will crank, but not start?
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Old 03-15-2019, 10:14 AM   #6 (permalink)
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They have to enter in vin#, mileage..etc. Its shit only Jeep service centers have the equipment to do. Trust me if I could just buy the PCU and install it myself I'd have it done in 30 minutes, problem solved.

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Old 03-15-2019, 10:16 AM   #7 (permalink)
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It doesnt turn over over when you crank the key and when you direct jump the starter it will crank but not turn over. When the ob2 reader is connected up every thing you can possibly check is N/A.

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Old 03-15-2019, 12:36 PM   #8 (permalink)
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i have never heard of an ECU needing to be programmed like that. i can literally take an ecu from any other 5.3L GM truck and plug it into my vehicle and it will run fine. yeah the VIN will be different, but who cares? unless there is some kind of security thing locking you out similar to GMs VATS technology. I would try getting another ECU and taking it to a non-dealership shop that can tune ECUs to check to see if there are any security items that can be turned off. the least you could do is plug in a known good ECU and then turn the key on, plug in the OBD2 reader, and see if you start seeing stuff other than N/A....
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Old 03-18-2019, 12:17 PM   #9 (permalink)
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Bro I'm with you and common sense would say it's that easy but apparently this is the case. The last thing I want is to deal with Jeep and their service center but I guess it is what it is. I've had nothing but problems with the electrical systems in this POS.

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