06 LJ Rubi Auto Trany PCM (?) Nightmares! - Rubicon Owners Forum
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post #1 of 23 (permalink) Old 09-24-2019, 05:45 PM Thread Starter
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06 LJ Rubi Auto Trany PCM (?) Nightmares!

One recent Aug afternoon after loading my ATV on a trailer and backing up to my cabin on level ground for a 50-60 yds, the wonderful Check Engine light came on. I disconnected the trailer and drove in to a local small town where I know the owner of a repair shop and he started pulling codes indicating Transmission Problems and PCM errors. The JP was still driving fine so I returned home 50 mi, no problems, shifting seems normal. Few days later to a local shop I trust and they started the code lookin. Indication of TCM, no PCM, and they found a used PCM and had it shipped in. Yesterday, they say their Software to connect all the ?CMs and the trany and the 4 L motor doesn't have the Wrangler as an option and they can't get programming done to interface the two! Anyone here that can explain the SAGA of my
dilemma ????? Will I wheel again?
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post #2 of 23 (permalink) Old 09-24-2019, 06:39 PM Thread Starter
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post #3 of 23 (permalink) Old 09-24-2019, 06:50 PM
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I hate to be the bearer of bad news, however my PCM died and I highly suggest you take it back to a dealer. They have the equipment to program it correctly and you can get a new PCM there. Anything else and I think its a real crapshoot. I never advocate for going to a dealership, however this is one situation where it pays off. Mine has ran beautifully ever since. LOL of course it ran beautifully before it just went belly up for no reason.
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post #4 of 23 (permalink) Old 09-25-2019, 08:52 AM
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Seems as though the PCMs are becoming a recurring problem, especially on the '05 and '06 models as they get older. With a dwindling supply, this will become more difficult to repair.
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post #5 of 23 (permalink) Old 09-25-2019, 09:17 AM
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The TCM is integral into the PCM for the '05 and '06 model years, are you sure you have the correct PCM?
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post #6 of 23 (permalink) Old 09-25-2019, 10:11 AM
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You said you have a shop you trust so why aren't they explaining what you have to do?
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post #7 of 23 (permalink) Old 09-26-2019, 08:08 PM
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I would also note, that in today's world there is no reason not to have a bluetooth ODBII and app to check/clear codes yourself before taking it into the shop. Even the higher quality ones are pretty cheap.

How did you even get it to the shop without a functioning PCM? It manages the fuel system and ignition. Did you tow it/trailer it in? If you drove it in, you have (or maybe at this point had) a functioning PCM.

I would go back to your original PCM and would start with a known good battery. Alot of engine management computers are sensitive to the voltage and current. If the battery is not working properly you can have some really wild and misleading errors downstream.

I agree with WayWestJeep beyond that point however. I don't think your Indy shop is going to have the ability to reprogram the PCM to the vehicle properly. If you need a new PCM programmed to the vehicle, this is one of the few cases where I would go back to the dealer to ensure it is done correctly.
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post #8 of 23 (permalink) Old 09-26-2019, 10:27 PM
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2006 LJ, if I remember correctly the pcm will come from the dealer blank. Then the dealer will install and program the software you need with your VIN.
A lot of independent shops subscribe to a service from companies like Snap-On and are able to do this also.
If buy Pcm from one of the many aftermarket suppliers then they will send it to you programed.
A used Pcm will have the software from whatever it came out of and the dealer can only update that software. So if you have a auto and the used is from a manual they cannot change it to suit your needs.
Now it gets confusing with sentry key (grey keys) and vehicle theft (VTSS). If equipped a used pcm will have that information from the donor vehicle and not work. Sometimes a dealer can rewrite a VIN and program your keys to get it to work but not always. So a used pcm is one of those buyer beware sort of things.
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post #9 of 23 (permalink) Old 10-05-2019, 02:05 AM
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I'm in the process of using Flagship One right now. My PCM was not pulsing the #3 injector. There were some related issues as well. They repaired my PCM and things have improved but the PCM is not sending a pulse to the #3 injector. They are honoring the warranty and I'm sending it back to them.

We verified that my repaired PCM was the problem when we substituted it with another PCM. MY PCM would not activate the noid light hooked to the #3 injector plug. The substituted PCM did activate the noid light. The issue between my PCM and the good substituted one was my sentry key set up would shut my TJ off, but we had time to see the flashing noid light.

I'll keep you posted about Flagship One. I know there's a lot of baggage regarding PCM repairs, refurbishes, vodoo's and prayers. I personally blame Jeep.
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post #10 of 23 (permalink) Old 10-10-2019, 02:33 PM
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Quote:
Originally Posted by WayWestJeep View Post
I hate to be the bearer of bad news, however my PCM died and I highly suggest you take it back to a dealer. They have the equipment to program it correctly and you can get a new PCM there. Anything else and I think its a real crapshoot. I never advocate for going to a dealership, however this is one situation where it pays off. Mine has ran beautifully ever since. LOL of course it ran beautifully before it just went belly up for no reason.
Same. My PCM died and even the dealer had a hard time getting the reprogramming software. My Jeep was with them for two weeks before it got sorted (not to mention the $$$!)
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