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Transmission wont shift?

Tiny
REELWORLD64
  • MEMBER
  • 3 POSTS
I'll take it to a shop. Auto zone's print out for both codes said poss bad connection or open circuit, I was hoping maybe just a electrical plug had come loose. Why do you think it has been running good for the last few days? Thanks Chris
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Monday, July 27th, 2020 AT 12:11 PM (Merged)
Tiny
TOMMYB389
  • MEMBER
  • 2 POSTS
  • 2002 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 94,000 MILES
Follow up to mhpautos answer to tommyb389 question
on 2/13/2011. Question was, 2002 Jeep Cherokee will not shift out of low gear. Will shift to 2nd gear @4,000rpm or 40 mph. I do have reverse.
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Monday, July 27th, 2020 AT 12:11 PM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Internmittent failure, these are the hardest to find. If it isnt acting up, the shop will test and all will be ok. Its actually better if it is acting up to have the shop check it then
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Monday, July 27th, 2020 AT 12:11 PM (Merged)
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
I would still work through the diagnosis chart supplied in the first post, I feel that this is the most probable cause.

Mark (mhpautos)
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Monday, July 27th, 2020 AT 12:11 PM (Merged)
Tiny
PHSCHICK91
  • MEMBER
  • 5 POSTS
  • 2002 JEEP CHEROKEE
  • 90,000 MILES
I go to take off in my jeep and can't even go 20 mph and it acts like it is in neutral and just revs up. If I turn if off and take off the battery terminals it will run fine
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Monday, July 27th, 2020 AT 12:11 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,772 POSTS
This sounds like a computer related issue. Have you scanned the computer to determine if there are any trouble codes related to the transmission? Have any warning lights come on? Is the fluid full and clean?
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Monday, July 27th, 2020 AT 12:11 PM (Merged)
Tiny
PHSCHICK91
  • MEMBER
  • 5 POSTS
Transmission fluid is good. I have not hooked it up to a computer. Where would I go to do that?
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-1
Monday, July 27th, 2020 AT 12:11 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,772 POSTS
I would like to say most parts stores will do it for free; however, they usually only have basic scanners that read engine codes only. You will most likely need to see a regular shop. You could call nationally recognized parts stores to see if they can do it. Please keep in mind, this could be other things too. There could be an issue with a shift solenoid, the governor, a clutch pack. The scan should identify if it is related to any of the electrical components that run the transmission. (I miss the old hydraulicly run transmissions. They were much easier to diagnose!)
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Monday, July 27th, 2020 AT 12:11 PM (Merged)
Tiny
PHSCHICK91
  • MEMBER
  • 5 POSTS
I took it to an auto shop and they reset something and said that should of helped it but it didn't
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Monday, July 27th, 2020 AT 12:11 PM (Merged)
Tiny
TOMMYB389
  • MEMBER
  • 2 POSTS
  • 2002 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 94,000 MILES
2002 Cherokee will not shift out of low gear.
Fluid level ok, no smell. Replace TPC. Checked connections on sensors on or near transmission. Proper ohms at output sensor at rear of transmission. A tech furnished ohm value at that time.(3 weeks ago)
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Monday, July 27th, 2020 AT 12:11 PM (Merged)
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Do you have reverse? If so check chary below.

Mark (mhpautos)
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Monday, July 27th, 2020 AT 12:11 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,772 POSTS
Do you remember what it was? Did they provide any information that could be helpful for me?
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Monday, July 27th, 2020 AT 12:11 PM (Merged)
Tiny
PHSCHICK91
  • MEMBER
  • 5 POSTS
I can't remember what they called it. I think it was a sensor
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Monday, July 27th, 2020 AT 12:11 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,772 POSTS
That is what I was thinking, something electric. It could be a bad shift solenoid.
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Monday, July 27th, 2020 AT 12:11 PM (Merged)
Tiny
DESERTJEEPER
  • MEMBER
  • 6 POSTS
  • 2001 JEEP CHEROKEE
  • 198,000 MILES
Transmission will not go into reverse gear when first started in the morning. Also when shifting into drive, it hangs in current gear until I let off the throttle slightly. After trans temp. Warms up (5 miles or so), the trans begins to work fine with reverse but slightly rough shifts. Shudders if rapidly accelerated from standing stop.

Work performed:
Valve body replaced (improved shifting into reverse but RPMs need to be a little high and it is sluggish) sometimes it will jerk into reverse around 1300 RPM if it was just driven recently
Trans oil: Toyota DII (level is correct)
Solenoids checked (13 ohms)
There is a fault code in the output speed sensor circuit (P0720)
Disconnected TCM and tested: same results
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Monday, July 27th, 2020 AT 12:12 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Have you checked the transmission line pressure yet with a pressure gauge?I always do that before replacing anything. Also have tried to diagnose the P0720 yet?
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Monday, July 27th, 2020 AT 12:12 PM (Merged)
Tiny
DESERTJEEPER
  • MEMBER
  • 6 POSTS
Have not checked line pressure yet. The P0720 code may be coming from the wiring itself. Its been awhile since I checked but I think it was over the 5 ohms for any part of that circuit stated in the powertrain and diagnostics manual from jeep. The sensor, when checked with a multimeter, puts out a beep every time the rotor passes by it (am I correct in thinking its an induction type?). When I get some time, I plan to repair that wiring harness.
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Monday, July 27th, 2020 AT 12:12 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Which model cherokee do you have classic sport etc?Also what size engine do you have?
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Monday, July 27th, 2020 AT 12:12 PM (Merged)
Tiny
DESERTJEEPER
  • MEMBER
  • 6 POSTS
2001 Jeep Cherokee 60th Anniversary Edition. VIN puts it down as Sport. Engine is 4.0L 6 cyl 242 naturally aspirated.
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Monday, July 27th, 2020 AT 12:12 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
I posted the trouble tree for code P0720 lets follow that trouboe tree and see what you find.I have seen output speed sensor issue cause transmission issues.
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Monday, July 27th, 2020 AT 12:12 PM (Merged)

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