Question about 2001 Jeep Grand Cherokee

1 Answer

Fault code P0720

My jeep grand cherokee 2001 limited.
the promblem with transmission, the 2nd and 4th gear doesn't shift !
i change the speed sensor and the electronic board but nothing change!
please i need your help for this issue.

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  • 3 more comments 
  • JAMAL GRAIN
    JAMAL GRAIN Jan 25, 2009

    hi sir,

    first thank u a lot for your prompt reply.

    when i changed the electronic board in the same time with the solenoid in the transmission i got a little sucsess !

    the 2nd gear works fine but the 4th one doesn't!

    and the code P0720 sitll exist,waiting your reply.

  • JAMAL GRAIN
    JAMAL GRAIN Jan 25, 2009

    hi sir,

    first i would like to thank u for your prompt reply.

    when i changed the electronic board in the same time changing the solenoid in the transmission i've got a little success !

    the 2nd gear works fine but the 4th one doesn't,and the code P0720 still exist !

    waiting your reply.

    thanks again.

  • JAMAL GRAIN
    JAMAL GRAIN Jan 29, 2009

    i already change that sensor,but no thing change the code

    P0720 still exist !

  • yadayada
    yadayada May 11, 2010

    I will explain to u about code's like i do all the time, a trouble code does not mean the sensor or component is defective, it just means that there is a problem with the circuit, this includes the sensor, the connector to the sensor the wiring to the sensor and every connector in that harness right up to and including the computer control module that we call the PCM, the problem u have will now take the intervention of the dealer to figure what the problem is, you wasted time and money by guessing, let the pro's look at it, this of course is your decision, but guessing will get real expensive real fast, not to mention the frustration. Many folks say but the dealer is so expensive! and they are, but there is a reason, all the equipment they have to buy to properly diagnose the car and repair it costs a bloody small fortune, I know this because I have worked only in dealers my whole working career.

  • yadayada
    yadayada May 11, 2010

    Have u tested the solenoid pack in the transmission

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  • 55 Answers

Code po720 is the output speed sensor malfunction

Posted on Jan 29, 2009

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> Replacement transmission not equipped with overdrive
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Since you have a computer-controlled transmission, it would be better to ask the onboard computer that question....you will probably get a much more definitive answer.

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Check engine light with following codes p 1529 p0720 p0715


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The range switch and the output speed sensors are the items that are abnormally affecting the operation of the transmission. The diagnostic logic in your computer can distinguish these issues from one another, so you'll definitely want to do both. You have no diagnostic code for the input speed sensor (P0715) listed, so I have made no recommendation to replace it. In my opinion, it's not a labor-intensive repair, so I wouldn't recommend replacing it unless you have reason to believe it's bad.

DTC - P0720 (OUTPUT SHAFT SPEED SENSOR SYSTEM)
Code No. P0720 Output shaft speed sensor system
If the output from the output shaft speed sensor is continuously 50% lower than the vehicle speed for 1 second or more while driving in 3rd or 4th gear at a speed of 30 km/h or more, it is judged to be an open circuit or short-circuit in the output shaft speed sensor and diagnostic trouble code No. P0720 is output. If diagnostic trouble code No. P0720 is output four times, the transmission is locked into 3rd gear or 2rid gear as a fail-safe measure.
Probable cause
Malfunction of the output shaft speed sensor
Malfunction of the transfer drive gear or driven gear
Malfunction of connector
Malfunction of the TCM

DTC - P0715 (INPUT SHAFT SPEED SENSOR SYSTEM)
Code No. P0715 input shaft speed sensor system
If no output pulse is detected from the input shaft speed sensor for 1 second or more while driving in 3rd or 4th gear at a speed of 30 km/h (19 mph) or more, it is judged to be an open circuit or short-circuit in the input shaft speed sensor and diagnostic trouble code No. P0715 is output. If diagnostic trouble code P0715 is output four times, the transaxle is locked into 3rd gear or 2nd gear as a fail-safe measure.
Probable cause
Malfunction of the input shaft speed sensor
Malfunction of the underdrive clutch retainer
Malfunction of connector
Malfunction of the TCM

Is needed replace.

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