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violant00 05-15-2010 07:08 AM

code p 0720
P0720 started it up this morning and the checl engine light came on :( anybody kknow what that is?

Frango100 05-15-2010 12:57 PM

Re: code p 0720
DTC P0720 Output Speed Sensor Circuit Malfunction
When i'm not wrong that is the output speed sensor from the tranny. Remove, clean and reconnect the connector to see if this will solve your problem.

violant00 05-15-2010 01:21 PM

Re: code p 0720
Yeah I ready that on wj... is it an easy job?

Frango100 05-15-2010 03:27 PM

Re: code p 0720
Cleaning the connector is very easy. You just have to crawl underneath your car and the output sensor is on the RH aft side of the tranny (at least on the 545RFE i have). If the cleaning doesn't help, you will have to look for some damaged wiring or maybe even the sensor itself. You could swap the input and output sensors to see if the fault stays or not.

violant00 05-15-2010 04:37 PM

Re: code p 0720
What exactly does that sensor do because I notice now that the tranny is having trouble shifting out of first gears

Frango100 05-15-2010 05:37 PM

Re: code p 0720
The TCM uses the input and output speeds from the tranny (and many other inputs) to calculate the shifting schedule. So if you miss on of the inputs, it can be that it starts shifting harsh or not at all.

violant00 05-15-2010 10:27 PM

Re: code p 0720
problem solved 99 and 00 difference in oss had to go back to autozone twice but i got it done so i don't have to take the train tomorrow:)

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