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  #1  
Old February 21st, 2012, 16:58
helliphinon8 helliphinon8 is offline
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Tranny won't shift into overdrive... TCM?

I've searched all forums and found nothing. I have a '98 XJ Classic with 150,000mi and a 6in lift with 33's and stock .355 gears. The problem is that it sometimes won't shift into OD . It does shift into OD most of the time, but when it doesn't, the check engine light comes on. I went to vatozone and got the codes pulled. Two were transmission related. 1st was P0705, which states "transaxle range switch fault", speed registered and the ECM detected an incorrect input from the transaxle range sensor- probable cause- failed tranny range sensor. 2nd was P0700, which is transaxle control system fault- explanation- a signal from the transaxle control module has a fault. My ? is... has anyone else had this problem, and what's the fix? Is it just the TCM, or is it a problem stemming from bigger tires with stock gears? And if all is true.. how do I fix it? Thanks in advance. N8
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  #2  
Old February 21st, 2012, 17:07
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Tim_MN Tim_MN is offline
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Re: Tranny won't shift into overdrive... TCM?

Adjust, clean, or replace the Neutral Safety Switch NSS. Inspect the NSS connector for corrosion and the NSS wires for damage.

Possible causes
- Open or short park/neutral position (NSS) switch circuit
- Poor park/neutral position (NSS) switch circuit connection
- Mis-adjusted park/neutral position switch (NSS)
- Park/neutral position (NSS) switch may be faulty
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  #3  
Old February 21st, 2012, 17:21
Naterenfo1 Naterenfo1 is offline
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Re: Tranny won't shift into overdrive... TCM?

Try unplugging the battery for 10 minutes to reset the TCM. I would replace the range sensor if the code persists - or at least check the wiring to be sure it is intact.

just my $.02

Good luck!
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  #4  
Old February 21st, 2012, 18:16
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Re: Tranny won't shift into overdrive... TCM?

Another problem can be the brake pedal switch.
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  #5  
Old February 21st, 2012, 19:05
helliphinon8 helliphinon8 is offline
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Re: Tranny won't shift into overdrive... TCM?

Tried the battery deal, but both tail lights flash only when I'm turning left with the brakes on. Freakin chryslers! Where the F is the NSS?
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  #6  
Old February 21st, 2012, 20:07
chassellbandit chassellbandit is offline
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Re: Tranny won't shift into overdrive... TCM?

Shift points normal? when mine was doing that it turned out to be the TPS, but like i said, my shift points were a little higher than they used to be as well. NSS is located on the passenger side of the transmission. Look at the Go jeep website for a walk through on cleaning it. i broke two trying to get them off, kind of a PITA
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  #7  
Old February 21st, 2012, 23:26
jeepfreak1020 jeepfreak1020 is offline
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Re: Tranny won't shift into overdrive... TCM?

Just had the exact same problem with mine man. Its prob the Torque Converter Clutch Solenoid. I had the same problem it wouldent shift into OD. Had a guy replace that and now she runs great again.
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  #8  
Old February 22nd, 2012, 00:00
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Re: Tranny won't shift into overdrive... TCM?

This is likely a Neutral Safety Switch issue. It is a pie-shaped piece on the passenger side of the tranny. Remove it, clean it, and reinstall it. It is very common to lose OD when the NSS is dirty. P0700 and P0705 are very often the NSS.
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  #9  
Old February 22nd, 2012, 07:26
O-Gauge Steamer O-Gauge Steamer is offline
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Re: Tranny won't shift into overdrive... TCM?

^^I agree. I had these codes when I purchased the 98 2 years ago. Took all of 45 minutes or so to remove, clean, reinstall and adjust. Losing the lockup is a very real possibility. Before jumping off the deep end and replacing solenoids, clean the NSS.

Unless it gets broken, there is no good reason to put in a new NSS so, do a search for the cleaning process, it is well documented here...
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  #10  
Old February 22nd, 2012, 10:22
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Re: Tranny won't shift into overdrive... TCM?

It could also be the Flux Capacitor or the Di-Lithium Crystals.

Since there is a Check Engine Light and a P0705 NSS fault code, the NSS is the logical place to start diagnostics and repairs.
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Blanket caught in the rear liftgate latch. Now I can't open.
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  #11  
Old June 19th, 2012, 18:10
helliphinon8 helliphinon8 is offline
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Re: Tranny won't shift into overdrive... TCM?

Quote:
Originally Posted by Tim_MN View Post
Adjust, clean, or replace the Neutral Safety Switch NSS. Inspect the NSS connector for corrosion and the NSS wires for damage.

Possible causes
- Open or short park/neutral position (NSS) switch circuit
- Poor park/neutral position (NSS) switch circuit connection
- Mis-adjusted park/neutral position switch (NSS)
- Park/neutral position (NSS) switch may be faulty
NSS is bullsh!t. I got a new one from a friend at Chrysler. NOT THE PROBLEM! But thanks for leading me to believe that was the problem. It was an un-necessary pain in the ass. THX!!
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  #12  
Old June 19th, 2012, 18:15
helliphinon8 helliphinon8 is offline
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Re: Tranny won't shift into overdrive... TCM?

It all turned out to be the Flux Capacitor. Duh... I should've known.
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  #13  
Old June 19th, 2012, 18:27
helliphinon8 helliphinon8 is offline
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Re: Tranny won't shift into overdrive... TCM?

So the NSS helped the reverse light problem, but nothing else. I actually drove the Jeep for 20 miles with it in the "mystery gear' between 3rd and 4th and it ended up pushing tranny fluid thru the dipstick tube and onto the exhaust. (keep in mind I have the extra towing tranny cooler too). Still, there's only 1 person that suggested another thing, jeepfreak1020 with the Torque Converter Clutch Solenoid idea. Is it my next step? Im almost ready to just sell this b!tch!! It's really starting to drive me nuts. It's my Daily driver. Fu*k japanese transmissions!!!! WTF was chrysler thinking????? Dumb bastards.
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  #14  
Old June 19th, 2012, 18:36
DanMan2k06 DanMan2k06 is offline
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Re: Tranny won't shift into overdrive... TCM?

Sounds like you need to have a brew and spend a day on the interwebz, bro.

Start with some simple diagnostics, not parts throwing. You threw a NSS at it an it didn't work. I'd say verify the TCM is working correctly next.

I googled "no overdrive aw4" and COUNTLESS threads came up on the same topic. Many of which are from this forum. I'll let you take it from here...
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  #15  
Old June 21st, 2012, 08:59
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Re: Tranny won't shift into overdrive... TCM?

Quote:
Originally Posted by Naterenfo1 View Post
Try unplugging the battery for 10 minutes to reset the TCM. I would replace the range sensor if the code persists - or at least check the wiring to be sure it is intact.

just my $.02

Good luck!
Quote:
Originally Posted by old_man View Post
Another problem can be the brake pedal switch.
Quote:
Originally Posted by chassellbandit View Post
Shift points normal? when mine was doing that it turned out to be the TPS, but like i said, my shift points were a little higher than they used to be as well. NSS is located on the passenger side of the transmission. Look at the Go jeep website for a walk through on cleaning it. i broke two trying to get them off, kind of a PITA
Quote:
Originally Posted by helliphinon8 View Post
Still, there's only 1 person that suggested another thing, jeepfreak1020 with the Torque Converter Clutch Solenoid idea.


Quote:
Originally Posted by helliphinon8 View Post
NSS is bullsh!t. I got a new one from a friend at Chrysler. NOT THE PROBLEM! But thanks for leading me to believe that was the problem. It was an un-necessary pain in the ass. THX!!


How do you know that your Jeep isn't in overdrive?
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