P0720 code

swkmtnbiker · Feb 10, 2009

I have a P0720 code causing my truck to rejected for emissions.

Changed the output sensor on the tranny and on the rear differential

reset codes but it comes back on after 15 miles per hour.

Any suggestions ??

Thanks

Neil · Feb 10, 2009

I can't help with what may be wrong but the 0720 is associated with the transmission sensor and not the differential sensor.

Neil · Feb 10, 2009

Is your speedo working below 20 mph and are or have the ABS and Brake light been on?

johncs78 · Feb 10, 2009

according to my book and my code scanner - flash code #15 OBD - 0720 = low output speed sensor , RPM above 15 mph , side notes = output shaft speed is less than 60 rpm with vehicle speed above 15mph"
....maybe something else is going on with the wiring...chase the wires.....just a thought...

swkmtnbiker · Feb 10, 2009

speed o is working fine and there have been no abs or brake light problems.

I figured it was the tranny sensor and changed that one first.

I need to check the wires as johncs78 suggests.

Thanks for the response's

Barbequepork · Aug 22, 2009

Neil said:
Is your speedo working below 20 mph and are or have the ABS and Brake light been on?

I have the same error code(P0720) and the ABS and Brake lights come on randomly...I am comfortable working on my car but not sure where everything is and usually use the boards "How to" posts with pics...can someone lend some assistance(pictures..etc) on how to replace the vehicle speed sensor (VSS) on the drivers side of the tranny tail shaft...I have no idea what that looks like..

I wanted to try the method from this post http://www.dakota-durango.com/forum/showthread.php?t=81457&highlight=p0720 but not successful in locating what I need...

Thank you in advance for the responses.

RJ_Hythloday · Oct 22, 2009

BBQ I'm guessing you must have taken care of this by now. I just got the code and am going to go get out the haynes manual, lmk if you need a description.

Barbequepork · Oct 22, 2009

RJ_Hythloday said:
BBQ I'm guessing you must have taken care of this by now. I just got the code and am going to go get out the haynes manual, lmk if you need a description.

I took it in to get it fixed but would like to know anyway :banana2:

Thanks!!

CBH · Oct 23, 2009

I just replaced mine. It is on the drivers side bottom of the tranny. It is molded plastic (even the tightening nut) and has an electrical plug with 2 small pins in it. It is not real tight in the tranny, and you want to be careful when you snug up the new sensor. Put a pan under it to catch the fluid, and have the new plug in your hand so that you can put it in quickly! Advance Auto has them for $17.99.

Barbequepork · Oct 23, 2009

I guess I'll be trying to fix it myself...got quoted by Dodge $148 to fix...picture if possible?

I'll have to search the forum to find out how to reset the error after I fix

Neil · Oct 23, 2009

After you fix it the code will clear or disconnect the negative battery cable and turn it to on for 30 seconds

Barbequepork · Nov 5, 2009

Thank you for the assistance everyone, I was able to change the sensor and reset the engine light.

RJ_Hythloday · Nov 5, 2009

Barbequepork said:
I guess I'll be trying to fix it myself...got quoted by Dodge $148 to fix...picture if possible?

I'll have to search the forum to find out how to reset the error after I fix

wow, that's a raping for a $16 part and 2 minutes under the truck.

Robbins · Mar 6, 2014

Just had this come on in 02 Dakota while spinning my tire coming in to mu shop.

P0720 code

swkmtnbiker

Neil

Neil

johncs78

swkmtnbiker

Barbequepork

RJ_Hythloday

Barbequepork

CBH

Barbequepork

Neil

Barbequepork

RJ_Hythloday

Robbins

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