Question about 1998 Jeep Grand Cherokee

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Speed Sensor - Engine Light - 1998 Jeep Grand Cherokee 5.2

Engine light on. Auto Zone diagnosed "Output speed sensor error". Replaced Output Speed Sensor and it actually made things worse. Would not shift out of 1st gear. Engine light came back on at 15 mph. Put old sensor back in and shifting returned to normal. New sensor looks exactly like the old one.

1) Should I try another brand sensor?

2) Is the Output sensor not the problem?

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The problem is AutoZone. Stay away from that place. I once worked there and was amazed by the number of returns. They sell low quality parts, most of them rebuilt and listed as new.

The best of the low end parts dealers would be KOI, NAPA, and Carquest. All others blow chunks. Else, just go to the dealer.

Posted on Feb 11, 2010

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Try another sensor. it is possible that you got a bad on and it is possible you will get another bad one (FYI)

Posted on Oct 04, 2009


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How do i install a engine speed sensor on my 1998 jeep grand cherokee loredo 4.0

Ther are more than one type of speed sensor for jeeps....I am chrysler jeep tech...there are 2 speed sensors on the trans and also speed sensors at the wheels (IF IT HAS ABS)...Normally the engine speed is done by an IAC Motor...If you are meaning idle...Can you send more information....
Also you may have a vacum leak..........You have an Input speed sensor and an output speed sensor ....Do you know exactly which it is ....Both are at transmission /If 4 wheel drive see transfer case also.I have the manual at my fingertips and will be glad to assist you with any problems............................I can help................metalpoet

Mar 03, 2011 | Jeep Grand Cherokee Cars & Trucks

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My 1998 Jeep Cherokee will start but will not shift out of first gear. Any solutions?

Is the check engine light on? Does the speedo work? Probaly is either a bad output speed sensor on the trans tail hosing or a bad govenor pressure solenoid and /or pressure sensor on the valve body. Need to have it scanned. Output rpms should be zero at a stop and increase with road speed . Govenor pressure should be within 3 psi of desired govenor pressure . Desired govenor pressure should match road road speed.I would recomend replace the sensor and solenoid as a pair.Please vote and good luck!

Jan 21, 2011 | 1998 Jeep Grand Cherokee

1 Answer

My Automatic grand cherokee limited 4.7litres (1999 Model) runs on only one gear without changing on diagnosing the error code P0731 ( gear 1 incorrect ratio) was reported

If you have a scan tool capable of looking at input and output speed sensor data for the transmission that is the first thing I would look at. If you don't than it wouldn't hurt to try a new input speed sensor. They are available from your local NAPA. The speed sensors are located on the drivers side of the transmission. They are a light yellowish white color. it will have a black connector with two wires. The one towards the front is the input speed sensor the one to the rear is the output speed sensor. you will need a 1"socket to remove it.

If replacing the sensor doesn't fix it you will need to bring it in and have it looked at.

The speed sensors are pretty common failures on Chrysler transmissions.

Jan 20, 2011 | 1999 Jeep Grand Cherokee

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Have a p0720 code should the output speed sensor be replaced. and where is it located

That is the code for bad output speed sensor. It threads into transmission near tailshaft (rear).

Jan 17, 2011 | 1998 Jeep Grand Cherokee

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A diagnostic check at autozone said it was the speed sensor. Where is the speed sensor located on Jeep Grand Cherokee 1998 5.2?

Has to be on the back of the trans. Output Speed Sensor
Hope you can get it out,without lowering the trans,to clear the floor pan

Put that into your search engine and find what you need.
Sorry I can't give you the exact location down to the inch

Now hope you have a bad sensor
Codes don't tell you, that it is bad,or to replace it

I would drive the vehicle with a scanner on it ,and look at data, or run off the ground, and back probe with a meter or oscilloscope, to test. ( I know you can't do that)

Nov 10, 2010 | 1998 Jeep Grand Cherokee

1 Answer

My light abs is lit what is it

This may be caused by a bad wheel speed sensor or the speed sensor in the rear difff, the best way to know is to have the computer scanned for abs codes, these codes will tell you where the problem is, for example it may say code p**** left front speed sensor, go to an auto zone parts store they will scan it for free.hope this helps.

Aug 30, 2010 | 1996 Jeep Grand Cherokee

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1998 Jeep Cherokee Limited 5.2 - Won't shift into drive

Check your transmission control relay, this would appear to be the fault in your system.

Oct 04, 2009 | 1998 Jeep Grand Cherokee

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I have a 1998 Jeep Grand Cherokee Limited 5.2 v8. Engine was lugging check engine light came on as engine quit. Pulled over turned off the key and it restarted and ran fine. Went to Auto ZOne they said...

Hello there, One of the problems Jeeps do have is Transmissions. It is very typical of the sensors and solonoid packs to go bad, Also Jeeps as well have well know problems with the computer causing transmission issues as well.

I suggest taking it to a shop other than a parts store they are great for basic info but a repair shop can actually look at what each sensor is doing in real time.

You are on the right track and I would most definetly address this asap rather than causing internal transmission problems.

Good luck and I hope this helps.

Oct 02, 2009 | 1998 Jeep Grand Cherokee

1 Answer

How do i replace a speed sensor fer a 1998 jeep grand cherokee

the part you are buying (im guessing a "transmission output control spe ed sensor") should be fairly small, almost like a cork in a wine bottle, shouldnt be that expensive either, under the jeep where the transmission is youll see what looks like a plug sticking out of the side of the transmission, the only thing attached to it is a quick-disconnect wire plug. unclip the wires and get the appropriate size deep socket to take the old sensor out. be warned that if you didnt already drain the transmission fluid, as soon as you start unscrewing that sensor, transmission fluid will start to pour out. as long as you have a drain pan under the sensor it will be ok. after you screw the new sensor in and re-attach the wire plug you will have to add additional tranny fluid via the fill spout under the hood, just like adding oil to the engine.

Apr 12, 2009 | 1998 Jeep Grand Cherokee

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