Jeep shifting issues

Tiny
RICNEM
  • MEMBER
  • 2002 JEEP GRAND CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 130,000 MILES
I have 2002 Jeep Grand Cherokee Laredo with about 130000 mile on it, v6, automatic. Yesterday it wouldn't shift from 1st gear. Took it to the shop, then once I hit about 38-40 it did shift. The shop flushed and re-filled the tranny fuid which they said was BAD BAD dirty. They thought it was shifting better, but it still is doing it. They said all sensors checked out ok, no engine light on? Any ideas?

No transmission issues prior to this.

Not sure if I should take it to a transmission shop, the dealer, or ride it till it dies.

Any advise is appreciated.


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Thursday, February 3rd, 2011 AT 6:59 PM

2 Replies

Tiny
CARADIODOC
  • EXPERT
40 mph in first gear! That will destroy the engine too. If it's second gear it's stuck in, that's "limp-in" mode that lets you drive it slowly to a repair shop without needing a tow truck. Once it goes to limp-in, there WILL be at least one diagnostic fault code in memory but it's the Transmission Computer that must be checked for codes, not the Engine Computer.

There are a couple of generalizations you can look for that might provide some clues. First, if it starts out in first gear and stays there, something is not working in the valves / solenoid pack. That's pretty rare. If it starts out in second gear right after starting the engine and putting it in drive, it is likely to be sensor-related since the computer detected a problem right away. You will notice lower power than normal when starting to move. If it starts out in first gear like normal, then shifts to second like normal, and maybe even third gear, then suddenly goes back to second and stays there, it still could be a sensor problem but more likely it is due to slippage in one of the clutch packs. When that slippage is detected, the transmission will stay in second gear until the ignition switch is cycled off and the engine is restarted.

If there's a problem inside the transmission, the dealer will usually replace it with a remanufactured one to insure quality and speed of repair. A transmission specialty shop will rebuild yours or one like it that they rebuilt previously. The dealer's transmission will have the latest updated parts to increase reliability. The independent shops know many tricks to increase reliability but will have to charge you extra to replace updated parts if they rebuild your transmission.

Caradiodoc
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Thursday, February 3rd, 2011 AT 8:55 PM
Tiny
NEILBRADSHAW
  • MEMBER
I've had similar problems that are intermittant. Can work perfectly for a month or two then suddenly sticks in gear either high or low. Work shops and diagnostics haven't solved it, but I feel certain that it is an electrical issue, poor earth conection maybe, but where does one start trying to find it?
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Sunday, September 28th, 2014 AT 12:47 AM

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