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Old 09-17-2010, 10:32 AM   #1
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1999 TJ ECM problem

My son and I converted our 1999 TJ standard to automatic. The ECM we received from LKQ (supposedly it was the only one in the nation) Model # P56041 with 469AD on the barcode....appears to have a some kind of security code that makes the Jeep stall after 5 seconds.

Is there a company that can re-flash the unit so it will work for us?

I called a couple of the Remanufactured companies here in Florida, they don't reflash, and however, even if I ordered a new/reman unit it won't work because we would supply our Jeep's VIN# and it would tell them it's for a standard not automatic.

I did find someone in NewYork off eBay that reflashes, but haven't called about the specs yet.

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Old 09-17-2010, 12:47 PM   #2
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I'm a bit surprised by this myself but according to the VIN decoder at Jeep VIN Information Page - GETAHELMET.COM the VIN doesn't specify the transmission type, only the engine type.

It sounds like that ECM was programmed for a SKIM security key system which I didn't even think was available in 1999. Could they have given you an ECM from a newer TJ?

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Old 09-17-2010, 01:05 PM   #3
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Will any P56041 from 1999 Jeep Wrangler 4.0 i6 auto work

Just curious if anyone knows if I can use a P56041 with different numbers additional numbers pulled from another 1999 TJ that hopefully will not have a security flash?

In other words, mine has P56041 469AD

Would a P56041 with different bold numbers work?


I'm hoping plug and play....
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Old 09-17-2010, 01:11 PM   #4
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hmmmm

Quote:
Originally Posted by Jerry Bransford View Post
I'm a bit surprised by this myself but according to the VIN decoder at Jeep VIN Information Page - GETAHELMET.COM the VIN doesn't specify the transmission type, only the engine type.

It sounds like that ECM was programmed for a SKIM security key system which I didn't even think was available in 1999. Could they have given you an ECM from a newer TJ?
I see a number listed on the back that appears to be 09979156 in a very small barcode.

Maybe thats the year?

And actually, about and hour ago, I called the Jeep Service Center here in town, they said something about a possible SKIM. They wanted me to bring the Jeep and Keys and he said could maybe find out. I did not give them the VIN #.

I will try the VIN decoder you posted..
The VIN they gave me with the salvage Jeep is: 1J4FY19S1XP482504

Maybe that will help.

Also, I posted another email for I saw your post. Thank you for posting back.

I sincerely appreciate your help!
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Old 09-17-2010, 01:44 PM   #5
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Vin#

Quote:
Originally Posted by Jerry Bransford View Post
I'm a bit surprised by this myself but according to the VIN decoder at Jeep VIN Information Page - GETAHELMET.COM the VIN doesn't specify the transmission type, only the engine type.

It sounds like that ECM was programmed for a SKIM security key system which I didn't even think was available in 1999. Could they have given you an ECM from a newer TJ?
The above didn't have the 1999 specs, however, I went to SCRIBD and they had the VIN Plate Decoding Info....

I can see that the VIn indicates 1999 Jeep 4.0, however, I have no idea if the ECM I have is correct.

I really don't want to go to Chrysler, if at all possible.

Some of the places I called said I could not get the unit flashed.
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Old 09-17-2010, 09:32 PM   #6
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widdle

I drive a 1999 Jeep TJ Sahara automatic 4.0L
and my son drives a 1999 TJ SE automatic 2.5L
actually he has been using the Sahara while the SE is getting more work done.

Is there any information that I have off of my Stock Jeeps
that would be useful to you just let me know
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Old 09-17-2010, 09:36 PM   #7
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My 1999 Sahara has a security key that I had to pay the dealer to program
a spare key and that was expensive

The 1999 SE does not. The key is something you can get at a hardware store duplicated.


Quote:
Originally Posted by Jerry Bransford View Post
I'm a bit surprised by this myself but according to the VIN decoder at Jeep VIN Information Page - GETAHELMET.COM the VIN doesn't specify the transmission type, only the engine type.

It sounds like that ECM was programmed for a SKIM security key system which I didn't even think was available in 1999. Could they have given you an ECM from a newer TJ?
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Old 09-18-2010, 09:32 AM   #8
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ECU info ?

Quote:
Originally Posted by jvc View Post
widdle

I drive a 1999 Jeep TJ Sahara automatic 4.0L
and my son drives a 1999 TJ SE automatic 2.5L
actually he has been using the Sahara while the SE is getting more work done.

Is there any information that I have off of my Stock Jeeps
that would be useful to you just let me know
It would be great if you could see the part number on your 4.0 ECM. That would help.

I had a guy email me back from an ebay salvage that has one listed for a 2001 Jeep Cherokee with the 56041 number, but he said it would not work.

I realize that it is newer than ours.

This is a nightmare. We have been working on this for 3 straight days. LKQ did tell me that they would take the part back, however, they don't have another one anywhere in the nation.

I even called HOTWIRE to try to see if the ECM could be flashed and it was also a no go.

Thank you for your help.

If I knew going to Chrysler would do the trick, I would go that route, however, I'm thinking deep pockets.
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Old 09-18-2010, 09:35 AM   #9
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No security key...

Quote:
Originally Posted by jvc View Post
My 1999 Sahara has a security key that I had to pay the dealer to program
a spare key and that was expensive

The 1999 SE does not. The key is something you can get at a hardware store duplicated.
Also, we have no security keys for either Jeep!

Well, I should say, our Jeep, the standard tranny did not....and as far as I know, I don't think the junked automatic did.
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Old 09-18-2010, 11:20 AM   #10
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1998
* Chrylser becomes Daimler/Chrylser
* New Exterior Colors:
o Chili Pepper Red Pearlcoat
o Deep Amethyst Pearlcoat
* Smart Key Immobilizer replaces previous Lock/Unlock keyfob system

Might be the issue
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Old 09-18-2010, 11:25 AM   #11
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I'll be darned, ya learn something every day. I wasn't aware the SKIM key system was available as early as in the '98 model. So yep, it's now entirely possible the OP got the right model year ECM but that it simply has the SKIM programming that is causing his problem.
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Old 09-18-2010, 02:28 PM   #12
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I'll get the numbers off the both ECUs

the information that is on the component that is mounted
in the engine compartment on the passenger side firewall
and in the tub on the tranmission tunnel above the shifter.... not sure
if I can see any numbers on this one but I'll give it a try.

but as Mr Bransford points out you may just need the security key and have it programmed.

Quote:
Originally Posted by Widdle View Post
It would be great if you could see the part number on your 4.0 ECM. That would help.
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Old 09-18-2010, 04:49 PM   #13
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Quote:
Originally Posted by DevilDogDoc View Post
1998
* Chrylser becomes Daimler/Chrylser
* New Exterior Colors:
o Chili Pepper Red Pearlcoat
o Deep Amethyst Pearlcoat
* Smart Key Immobilizer replaces previous Lock/Unlock keyfob system

Might be the issue
If it was available it might have been an option, my '98 Sahara doesn't have a smart key or keyfob system.
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Old 09-18-2010, 05:04 PM   #14
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Quote:
Originally Posted by jeepjones View Post
If it was available it might have been an option, my '98 Sahara doesn't have a smart key or keyfob system.
Definitely was available in '99 as an OPTION . My '99 does not have a chip key but the original owners manual makes reference to it as an option.
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Old 09-18-2010, 05:27 PM   #15
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Put original ecm on

We put the "Standard Tranny" ECM back on the Jeep and drove it to AutoZone today.

It was a little rough driving, like it was shifting gears like the standard used to do, however, it was manageable and drove okay when it wasn't trying to shift.

Autozone can get the ECM's for about $380.00 remanufactured of course. They use Cardone and their part number for a 1999 Jeep Wrangler 4.0 automatic was 79-1469V, which after some research the part numbers after the dash is the same numbers in my infected unit (P56041-469). They did say that they would have to call Cardone to have the VIN# and mileage input, but, that was it.

Didn't order it.

Maybe I'll go to a different AutoZone to have them scan the Jeep for codes.
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Old 09-18-2010, 05:32 PM   #16
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Quote:
Originally Posted by jvc View Post
I'll get the numbers off the both ECUs

the information that is on the component that is mounted
in the engine compartment on the passenger side firewall
and in the tub on the tranmission tunnel above the shifter.... not sure
if I can see any numbers on this one but I'll give it a try.

but as Mr Bransford points out you may just need the security key and have it programmed.
Hey, thanks jvc....

Our ECU is located right by the battery in front of the passenger seat.

I will call Chrysler again to see what they say about the security key/skim.
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Old 09-20-2010, 08:27 AM   #17
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my son did not show this weekend
but as soon as he does I'll get the P/N
but i did check my FSM and found this chart
EP0=2.5L Engine
ER0=4.0L Engine
DG0=Automatic Transmission
DBB= Manual Transmission

1 MODULE, Powertrain Control
56041457AC 1 EP0 DBB FEDERAL
56041458AC 1 EP0 DBB CALIFORNIA
56041459AC 1 EP0 DBB EUROPE
56041460AC 1 EP0 DBB LEADED FUEL
56041461AC 1 EP0 DG0 FEDERAL
56041462AC 1 EP0 DG0 CALIFORNIA
56041463AC 1 EP0 DG0 EUROPE
56041465AC 1 ER0 DBB FEDERAL
56041466AC 1 ER0 DBB CALIFORNIA
56041467AC 1 ER0 DBB EUROPE
56041468AC 1 ER0 DBB LEADED FUEL
56041469AC 1 ER0 DG0 FEDERAL
56041470AC 1 ER0 DG0 CALIFORNIA
56041471AC 1 ER0 DG0 EUROPE
56041472AC 1 ER0 DG0 LEADED FUEL
2 56041472AC 1 SCREW, (.190-16x1.75) Not
Serviced ***, (NOT SERVICED),
-3 56041472AC 1 COVER, Module, (NOT
REQUIRED
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Old 09-20-2010, 08:29 AM   #18
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i'm curious to know what the difference is between
469AC and 469AD ???
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Old 09-20-2010, 07:16 PM   #19
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Quote:
Originally Posted by jvc View Post
i'm curious to know what the difference is between
469AC and 469AD ???

Hey, thanks for the post, jvc.....great and very helpful chart!

According to the reflash guy, the different letters that appear after the 469 are actually the flash updates.

So, I'm wondering if the AD indicates SKIM/Immobilizer Flash.......hmmm.

Anyway, in the morning, I will call Cardone and ask about that.
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Old 09-20-2010, 11:38 PM   #20
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I would like to change my tranny eventually on my 04 sahara to auto from stand. Is there any where I can find out how to do this. I am reading this tread and I see a promblem.
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Old 09-21-2010, 11:32 AM   #21
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I do not think the letter indicates the SKIM.

Quote:
Originally Posted by Widdle View Post
According to the reflash guy, the different letters that appear after the 469 are actually the flash updates.
So, I'm wondering if the AD indicates SKIM/Immobilizer Flash.......hmmm.
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Old 09-23-2010, 05:09 PM   #22
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Quote:
Originally Posted by jvc View Post
I do not think the letter indicates the SKIM.

Well, I sent our ECM to a company in Davie, Florida to be "rebuilt" and "reprogrammed" and they tell me that the unit is actually out of a "Sahara" which was programmed from the factory with the SKIM.

But, all is well, because they just took our original VIN#, along with the new automatic tranny, engine info and the current mileage and entered into their computer.....so, I should have it back within a couple of days.

I will let all know how it drives, rides and runs!!

By the way, those guys really know their stuff and are very personable to deal with.....and are super fast.....they just received it today.
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Old 09-23-2010, 07:49 PM   #23
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Quote:
Originally Posted by Widdle View Post
Well, I sent our ECM to a company in Davie, Florida to be "rebuilt" and "reprogrammed" and they tell me that the unit is actually out of a "Sahara" which was programmed from the factory with the SKIM.
what does it cost to reprogram?
what model year Sahara did 'they' say the ECU was from ?

just curious....
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Old 09-24-2010, 09:00 AM   #24
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Quote:
Originally Posted by jvc View Post
what does it cost to reprogram?
what model year Sahara did 'they' say the ECU was from ?

just curious....
The cost is 124.95....if you go online to eBay, they have an option under their "buy theirs and return core" listing for sending yours back to repair.

I almost missed it when reading the details.

I will find out today what the model year Sahara is...
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Old 09-15-2013, 01:20 PM   #25
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hey. i am having a smilar problem. My alternator is not charging the battery. And the guages are all wacked. how did the new remanufactured PCM work out? i believe my volt reg in the PCM is fried.

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