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Unread 03-16-2011, 07:54 PM   #1
zte87
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p0720 output shaft speed sensor!

what all happen when your output shaft speed sensor in now working like it should? I don't have any cel but my jeep has a stored p0720 code and waundering what all I might fix with replaceing it!

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Unread 03-16-2011, 10:51 PM   #2
jnicewan
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The output shaft speed sensor is needed for proper trans shifting ( mainly governor pressure sensor ) If this sensor fails the PCM will use the vehicle speed sensor as a back-up. Main type of sensor failure would be an open circuit or inoperative sensor, which would make the trans stick in 1st gear. Its hard to say how your sensor has failed, but if you have issues with shift timing, or lack of upshifts, there is a good chance its related to the sensor.

Keep in mind this is the sensor thats on the O/D housing, not on the transfer case. Its right behind the pan on the drivers side and points slightly down and outward. The 2-wire sensor has a Hex built on it and it screws in/out.
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Unread 03-16-2011, 11:08 PM   #3
zte87
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when you say stick in first do you mean longer than normal or just won't sift out of first!
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Unread 03-16-2011, 11:18 PM   #4
jnicewan
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Well, if the sensor failed completely or all the time, you would not have a shift. If the sensor is producing erratic, or intermittant signals then you will probably get upshifts, but they may be delayed or erratic and intermittant.
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Unread 03-16-2011, 11:34 PM   #5
zte87
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it does seem to take a while to get out of first gear and it also with down shift out of no wear! I called the parts store and they telling my the part they have is 35 bucks and that sensor is held in by one bolt! is it supposed to be a screw in deal? If any one can post up a link to the right sensor that would be asome I don't want to end up with the wrong one! my rig is a 96 4.0 gc Laredo thanks you guys!
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Unread 03-17-2011, 12:24 AM   #6
jnicewan
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Here is the output shaft sensor.



Here is where it goes, its the tan/black sensor on the lower/right part of the trans. That sensor is mounted on the Lower, LH side of the overdrive unit on the back of the transmission.


Here is the one that they probably quoted you, this is not the one you need! This sensor is mounted on the back of the transfer case.

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Unread 03-17-2011, 12:28 AM   #7
jnicewan
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Link didnt work, O-reillys has them, Dorman Part # : 917-602. Im sure other auto parts stores will carry them, along with trans parts shops.
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Unread 03-17-2011, 03:08 AM   #8
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I've broken several of these sensors while wheeling and find that the OEM replacement is more reliable than others.
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Unread 03-17-2011, 06:32 PM   #9
zte87
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thanks for the help guys! I picked up one and threw it on today! it seems to shift better now!
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Unread 06-04-2015, 07:53 AM   #10
cltair
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output shaft sensor

I have a 1995 Jeep Grand Cherokee Limited Full Time 4WD Does not have that sensor you show? only the speed sensor on transfer case (larger 3 wire setup) Am I not seeing the correct sensor or am I in the wrong place? Car will drop out of OD or not shift into OD Intermittently. Sometimes not for a week. Also shows up as Code 12 on test from dash {engine check light.} Any idea's were to look?
Thanks,
p1nball
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Unread 06-04-2015, 01:54 PM   #11
kg6mov
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4 years dead!

Fill out your jeep profile so we know what engine and trans you have, can't help you otherwise.
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Unread 06-04-2015, 06:44 PM   #12
cltair
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Filled Profile . Will Send Photos Tomorrow
Thank you!
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Unread 06-04-2015, 10:11 PM   #13
jnicewan
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Quote:
Originally Posted by cltair View Post
I have a 1995 Jeep Grand Cherokee Limited Full Time 4WD Does not have that sensor you show? only the speed sensor on transfer case (larger 3 wire setup) Am I not seeing the correct sensor or am I in the wrong place? Car will drop out of OD or not shift into OD Intermittently. Sometimes not for a week. Also shows up as Code 12 on test from dash {engine check light.} Any idea's were to look?
Thanks,
p1nball
95 5.2 had the 46RH trans, The RH trans does not have the output shaft speed sensor. The OSS is part of the RE line of transmissions. Its main function is for inputs for governor pressure control, where the RH trans used a mechanical governor.

O/D functions/shifts in your trans are electronic though. Before assuming a problem with the trans, and various sensors that I would look at a few sensors that influences O/D shifts. TP sensor and Brake Lamp switch are known for causing problems as you describe, if either sensor is working intermittent or erratic if will mess with O/D
)
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Unread 06-05-2015, 07:39 AM   #14
cltair
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Thank you! Will check out the TP sensor and Brake lamp switch
Joel
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Unread 06-12-2015, 04:04 PM   #15
cltair
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Thanks for the help. Replaced TPS sensor on Holley Throttle Body and cleaned the ports. Jeep runs great smooth shifts and stays in OD. Does not go out as jeep slows down. Used to slam into 3 gear at 50MPH. It is part # 21821P from Advance Auto. $37.00 not the 91.00 from Jeep Dealer I would recommend replacing this part for any older Jeep. Mine has 195K on it and Now runs great. I attached the photo of part and box
Thanks,
Joel
img_2852.jpg   img_2854.jpg   img_2855.jpg  
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