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Old 04-03-2014, 12:03 PM   #1
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Best place to buy an ECM

So my voltage regulator in my ECM I believe went out and now my battery is not keeping a charge. Brand new battery and alternator are in but still no charge. So everything leads to a failure of my ECM. My question is where is the best place to buy another one?

Thanks!

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Old 04-03-2014, 01:09 PM   #2
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Have you tried jeepsareus.com, i believe they just need your vin number to get one set up for you.

EDIT... http://www.jeepsareus.com/p/JWTJ/120.html

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Old 04-03-2014, 01:53 PM   #3
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So my voltage regulator in my ECM I believe went out and now my battery is not keeping a charge. Brand new battery and alternator are in but still no charge. So everything leads to a failure of my ECM. My question is where is the best place to buy another one?

Thanks!
The voltage reg. Is in your ECM?
Really? Just never heard of it. Not trying to be smart assed. Actually asking

You could have a direct short some place and the bat. Is charging but can't keep it cuz of the short
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Old 04-03-2014, 06:36 PM   #4
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I'm not too familiar with the electrical aspect of my jeep. Lol. So I might be wrong, but the unit I'm talking about is on the firewall right behind the battery. I've taken it to 2 shops and all connections are good. I have a new battery, alternator, and new battery temperature sensor. Just trying to figure this out because my jeep will not stay running. The battery is just not receiving a charge. Any help would would be great!
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Old 04-03-2014, 06:40 PM   #5
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The old cards had a voltage regulator in them as a sperate unit. The new ones are internal on the ALT.
So if that's your problem have the alt. Checked out.
That can be done free at auto zone
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Old 04-03-2014, 06:42 PM   #6
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You are correct that is where voltage regulator is but Chrysler calls it a PCM ( power train control module) but it is called ECM by other auto makers including Nissan
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Old 04-03-2014, 06:47 PM   #7
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Huh! Good to know! I'm still learnig on this one. My last one was a YJ but never had a issue with it. The TJ is driving me nuts picked up a DW today and at 40mph. Was no happy! But I know the front end needs parts but don't have money at this point. So pray for the best till this wreck stuff is over.
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Old 04-03-2014, 06:48 PM   #8
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you are correct that is where voltage regulator is but chrysler calls it a pcm ( power train control module) but it is called ecm by other auto makers including nissan
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Old 04-03-2014, 06:50 PM   #9
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I just put a new alternator in and I'm still having the same problem.
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Old 04-03-2014, 06:53 PM   #10
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A few things to be careful with

PCM interacts with instrument cluster and BCM (body control module) but on TJ BCM is part of instrument cluster so PCM can be programmed by the special few with proper equipment to match VIN and true mileage

Other issue is alarms stored in BCM and sentry key codes

People who swap PCMs for testing get into trouble bedside the alarm and sentry key functions are dormant in all PCM until plugged into a harness with either of these options then they are permantely activated rendering them useless if swapped back into a vehicle without theses options

Bottom line go with a high volume well reviewed supplier if buying an new or used PCM as Craig's list cheepo may only work as a door stop or paper weight
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Old 04-03-2014, 07:05 PM   #11
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I guess if I was sure only the voltage regulator portion of the PCM was bad I would seriously look into swapping in an internally regulated alt and sticking with my original PCM

Or at least research the possibility of installing an independent remote mounted voltage regulator to control the stock alt

Pretty sure the first is likely doable not as sure about 2nd option but would at least research it a little
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Old 04-04-2014, 08:21 AM   #12
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read here sounds like swapping in internal regulated or a seperate external voltage regulator have both been done

97 TJ alternator compatibility
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Old 04-04-2014, 10:04 AM   #13
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The ECM was recalled last fall wasn't it? If it ever screws up they were giving out new/reman ones and reimbursing people for previous repairs.

But I think that was 03 and up....

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