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  #13  
Old 06-08-2011, 04:43 PM
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Re: Variable Speed Sensor?

OK, the check engine light came on again on my way home. The code is P0720, which translates to
Low Output SPD Sensor RPM Above 15 MPH
The relationship between the Output Shaft Speed Sensor and vehicle speed is not within acceptable limits.


So I guess it is the Variable speed sensor in the transmission, correct? I am experiencing no driving issues there is a hard shift periodically but not often.
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Old 06-09-2011, 10:24 AM
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Re: Variable Speed Sensor?

Then there is defenitely something wrong with the output speed sensor or wiring.
Could not find anything telling that this sensor is also used as speedometer input, but you never know.
Does your jeep has a T-case with 4-Lo? Because when it has, the output speed from the tranny is then not always equal to the vehicle speed. In 4-Hi the tranny would turn with less revs then in 4-Lo for the same vehicle speed.
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Old 06-09-2011, 12:57 PM
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Re: Variable Speed Sensor?

Yes Frank, it has 4lo but I keep it in on demand. I just bought it 2 weeks ago so I am unsure of it's life. But all signs are good, records maintained with local Jeep dealerships, has only 86k documented miles. I did replace the VSS last night and the code has not sprung again it was only $18 with tax at autozone and 5 mins to replace without even jacking it up LOL. This did not cure my speedo issue though. I will be looking at the ABS sensors this weekend for any signs of physical damage, as those convey info to the speedo. I thank you and Stephen for your input as there were many little details about my new Jeep I didn't know, I.E. gauge test and odometer trouble codes.
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Old 06-09-2011, 01:14 PM
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Re: Variable Speed Sensor?

Normally when there is a problem with one of the wheel speed sensors, your ABS light will be on. The speedo signal comes from the rear sensors. I heard of ABS problems before and by just cleaning the sensor and target ring it could be solved. When that doesn't work, only a scanner can tell if the problem is in the ABS system or not.
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  #17  
Old 06-09-2011, 02:25 PM
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Re: Variable Speed Sensor?

Thanks again! I was prepared to look at all 4. Didn't know cleaning was an option. I will try that first, these are more expensive than the VSS. And no ABS light yet, knock on wood.
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