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  #1  
Old 09-21-2014, 12:48 PM
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Question Need some DTC help

Hi everyone, first post! I posted this at jeepforum.com, and no replies after 80 views. I guess if you don't have a paid membership there you don't get any notice. Anyways, I found several answers & tips for other items here & was hoping you guys could help me out.

We just bought a Jeep Grand Cherokee Limited w/ 5.7l Hemi. it's a "Trail Rated" model.. which I assume means a little heavier duty suspension. 121,000 miles.

So, before I negotiated a price on this Jeep, I hooked a scanner to the car & received 2 codes. The first was P05?? for low voltage. The second was P0700 for Transmission Control System Malfunction. I used these to negotiate a lower price . I had hoped that fixing the low voltage issue would clear up the transmission TCM code. Tested the battery (low charge- replaced), and the alternator & starter (they tested good). Re scanned after clearing the codes & the P0700 is still there.

Any suggestions? I can't seem to find a replacement part. Is this the N23 recall issue? It drives good, no missed shifts... but it does feel like it is constantly going between 4th & 5th on the freeway... maybe the MDS?. No sudden drops into neutral, no going into limp mode, and it transfers into 4Low without issue. I purchased an extended warranty from a company I had used before (real good service, most coverage out of several other companies)... so I'm not too worried about it being a huge cost.

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Old 09-22-2014, 03:19 PM
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Re: Need some DTC help

I don't have a response or any info on your problem but I don't want you to think you're being ignored here. I have received lots of help here. Just be patient.
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Old 09-24-2014, 12:31 PM
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Re: Need some DTC help

Quote:
Originally Posted by Furyous68 View Post
Hi everyone, first post! I posted this at jeepforum.com, and no replies after 80 views. I guess if you don't have a paid membership there you don't get any notice. Anyways, I found several answers & tips for other items here & was hoping you guys could help me out.

We just bought a Jeep Grand Cherokee Limited w/ 5.7l Hemi. it's a "Trail Rated" model.. which I assume means a little heavier duty suspension. 121,000 miles.

So, before I negotiated a price on this Jeep, I hooked a scanner to the car & received 2 codes. The first was P05?? for low voltage. The second was P0700 for Transmission Control System Malfunction. I used these to negotiate a lower price . I had hoped that fixing the low voltage issue would clear up the transmission TCM code. Tested the battery (low charge- replaced), and the alternator & starter (they tested good). Re scanned after clearing the codes & the P0700 is still there.

Any suggestions? I can't seem to find a replacement part. Is this the N23 recall issue? It drives good, no missed shifts... but it does feel like it is constantly going between 4th & 5th on the freeway... maybe the MDS?. No sudden drops into neutral, no going into limp mode, and it transfers into 4Low without issue. I purchased an extended warranty from a company I had used before (real good service, most coverage out of several other companies)... so I'm not too worried about it being a huge cost.
This is likely not a result of the N23 recall. I would recommend if it has not had the recall performed (you can check on the Jeep website, though it likely has before it was sold to you), not to bother until Chrysler have their act together and stop breaking people's 4WD low! The P0700 is just a code to let you know that their is a detected transmission fault. You will need a better scanner to get the actual codes that are tripping the P0700. Once you have those, you'll have a better idea what might be going on. It could be something simple like one of the transmission filters having a split (quite common), to some catastrophic failure. No way to tell without the codes. Based on your description of what could be a symptom, it could be something related to the torque converter locking and unlocking, but that's a blind guess.
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Old 09-24-2014, 01:10 PM
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Re: Need some DTC help

I'll see if I can get it to a shop & have it scanned. I did the DTC display trick (Key on/ off 3 times) and no codes showed up. Does that mean anything?
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Old 09-24-2014, 04:41 PM
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Re: Need some DTC help

Not necessarily. Some of the 'deep' codes will not display through the key dance.
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Old 09-24-2014, 10:34 PM
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Re: Need some DTC help

It just occurred to me that no codes showed up on the display... not even the P0700 code my scanner picked up. That doesn't seem right, does it?
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Old 09-25-2014, 02:05 AM
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Re: Need some DTC help

Quote:
Originally Posted by Furyous68 View Post
Hi everyone, first post! I posted this at jeepforum.com, and no replies after 80 views. I guess if you don't have a paid membership there you don't get any notice. Anyways, I found several answers & tips for other items here & was hoping you guys could help me out.

We just bought a Jeep Grand Cherokee Limited w/ 5.7l Hemi. it's a "Trail Rated" model.. which I assume means a little heavier duty suspension. 121,000 miles.

So, before I negotiated a price on this Jeep, I hooked a scanner to the car & received 2 codes. The first was P05?? for low voltage. The second was P0700 for Transmission Control System Malfunction. I used these to negotiate a lower price . I had hoped that fixing the low voltage issue would clear up the transmission TCM code. Tested the battery (low charge- replaced), and the alternator & starter (they tested good). Re scanned after clearing the codes & the P0700 is still there.

Any suggestions? I can't seem to find a replacement part. Is this the N23 recall issue? It drives good, no missed shifts... but it does feel like it is constantly going between 4th & 5th on the freeway... maybe the MDS?. No sudden drops into neutral, no going into limp mode, and it transfers into 4Low without issue. I purchased an extended warranty from a company I had used before (real good service, most coverage out of several other companies)... so I'm not too worried about it being a huge cost.

What year is your WK? Have you experienced all of your gear indicator boxes illuminating simultaneously? Does it ever lag or delay when shifting to reverse?
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Old 09-25-2014, 10:44 AM
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Re: Need some DTC help

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Originally Posted by Rkirk View Post
What year is your WK? Have you experienced all of your gear indicator boxes illuminating simultaneously? Does it ever lag or delay when shifting to reverse?
Sorry.. it's a 2005.

I have not experienced any of those issues you mentioned. It seems to work fine. The only thing I noticed was that it seemed to shift between 4th & 5th a lot on the freeway. BUT, I have no prior experience with MDS engines, and it may have just been that.
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Old 09-25-2014, 11:01 AM
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Re: Need some DTC help

If the torque converter clutch applies and releases, then you will see a drop or raise in engine rpm. Same if it would change gear every time. MDS should not give any rpm change i believe.
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Old 09-25-2014, 06:44 PM
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Re: Need some DTC help

I noticed a change in sound. I was trying to pay attention to everything else, didn't pay attention to RPM

I'll watch that next time I drive it.
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