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Old 09-19-2021, 09:42 AM   #1
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P0720 Error Code on Ford Triton v10

I have a 2000 Fleetwood RV with a Ford Triton v10 that is throwing a P0720 Engine Code Error. I use a FIXD OBD2 Scanner and it defines this error as “Output Speed Sensor Insufficient Input”. This error will eventually result in the “Service Engine Soon” light coming on. We bought the RV a little over a year ago and the Service Engine Soon light was on then. I have had the situation checked out now by 4 different shops – an RV repair place, a regular auto repair place, a tire place which had a guy supposedly good with RVs and a Transmission repair place. They have cleared the light (which I now see by using the FIXD device is nothing) but it always came back and there has never been any noticeable effect on the transmission shifting, speedometer function, etc. After a year, 20+ camping trips and over 4000 road miles, I believe I now have a 100% ability to either prevent this error or cause this error. After I start up the RV, I use FIXD to scan and if the code is found and/or if the Service Engine light is on then I clear it (light and code). Once I am on the move, if I have to come to a complete stop at a light, traffic backup, etc. then the Overdrive OFF light on the gear shift lever will start blinking within 2-15 seconds of being stopped. This is true whether I start out with the Overdrive Off or not, either way. Once the OFF light is blinking and I’m ready to move again, if I accelerate very gently the transmission will shifting from 1 to 2, 2 to 3 and 3 to 4 (if Overdrive is ON) perfectly smoothly. However, if for example I am stopped on a bit of an up incline and I need to accelerate a bit more aggressively to get going, I will get a slight jerk as the transmission shifts. Regardless, though, once I am rolling again, within 10 to 20 seconds the OFF light will stop blinking and all will be totally fine until I have to come to a dead stop again. Now, if I do a FIXD scan after the OFF light as started blinking, the P0720 error will be there. If I don’t clear the code then after a while, sometimes days or weeks depending on our amount of camping, the Service Engine Soon light will come on. OK, now for how to prevent this from happening…simple, don’t come to a complete stop! Not always possible but by paying close attention to upcoming stop lights, stopped traffic, etc, I have become a master at beginning to break VERY early and slowing WAY down, I mean down to the level of rolling along at 2 inches per second. By driving this way, I have been able to go for entire trips without ever coming to a dead stop…and therefore never getting a flashing OFF light and never getting a P0720 error. But, it’s annoying to drive this way. So, my question is: what do I need to do to fix this? Replace a speed sensor? Which one? Or get something fixed in the transmission? Any suggestions would be appreciated. Scott
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Old 09-19-2021, 10:28 AM   #2
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Code P0720 is for the output speed sensor (OSS) on the rear of the transmission. I doubt that the sensor is really the problem.

Since this happens only when you are stopped, I suspect there is noise in the signal. That noise usually happens from a bad diode in the alternator. Even with a bad diode, the alternator can still charge, but it puts an AC ripple on top of the DC current.

If you can get an oscilloscope on the alternator output you will be able to see this. A repair shop that specializes in automotive electrical should be able to do this. Transmission shops probably cannot check this.
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Old 09-19-2021, 10:41 AM   #3
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You might try replacing the OSS on the transmission.
If not that check the OSS wires.





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Old 09-20-2021, 12:21 AM   #4
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Quote:
Originally Posted by Scott2 View Post
I have a 2000 Fleetwood RV with a Ford Triton v10 that is throwing a P0720 Engine Code Error. I use a FIXD OBD2 Scanner and it defines this error as “Output Speed Sensor Insufficient Input”. This error will eventually result in the “Service Engine Soon” light coming on. We bought the RV a little over a year ago and the Service Engine Soon light was on then. I have had the situation checked out now by 4 different shops – an RV repair place, a regular auto repair place, a tire place that had a guy supposedly good with RVs, and a Transmission repair place. They have cleared the light (which I now see by using the FIXD device is nothing) but it always came back and there has never been any noticeable effect on the transmission shifting, speedometer function, etc. After a year, 20+ camping trips, and over 4000 road miles, I believe I now have a 100% ability to either prevent this error or cause this error. After I start up the RV, I use FIXD to scan and if the code is found and/or if the Service Engine light is on then I clear it (light and code). Once I am on the move, if I have to come to a complete stop at a light, traffic backup, etc. then the Overdrive OFF light on the gear shift lever will start blinking within 2-15 seconds of being stopped. This is true whether I start out with the Overdrive Off or not, either way. Once the OFF light is blinking and I’m ready to move again, if I accelerate very gently the transmission will be shifting from 1 to 2, 2 to 3, and 3 to 4 (if Overdrive is ON) perfectly smoothly. However, if for example I am stopped on a bit of an up incline and I need to accelerate a bit more aggressively to get going, I will get a slight jerk as the transmission shifts. Regardless, though, once I am rolling again, within 10 to 20 seconds the OFF light will stop blinking and all will be totally fine until I have to come to a dead stop again. Now, if I do a FIXD scan after the OFF light as started blinking, the P0720 error will be there. If I don’t clear the code then after a while, sometimes days or weeks depending on our amount of camping, the Service Engine Soon light will come on. OK, now for how to prevent this from happening…simple, don’t come to a complete stop! Not always possible but by paying close attention to upcoming stop lights, stopped traffic, etc, I have become a master at beginning to break VERY early and slowing WAY down, I mean down to the level of rolling along at 2 inches per second. By driving this way, I have been able to go for entire trips without ever coming to a dead stop…and therefore never getting a flashing OFF light and never getting a P0720 error. But, it’s annoying to drive this way. So, my question is: what do I need to do to fix this? Replace a speed sensor? Which one? Or get something fixed in the transmission? Any suggestions would be appreciated. Scott

You must check your battery water level because sometimes battery power when down then this problem is shown up. Battery power is connected with the light. When battery power is down then lights power depends on speed. That's why when you slow down speed then it jerks and off the light.
I suggest you first check then if it the not solves the problem then you change this before the talk the expert's mechanics.
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Old 09-20-2021, 02:15 PM   #5
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Thanks Mark, Subford and Senky

I'll follow up on these suggestions and let you know! Scott
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Old 09-21-2021, 07:28 AM   #6
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noise

I seem to recall a TSB about bad grounds for the PCM that caused some weird shifting
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Old 09-21-2021, 02:28 PM   #7
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A couple of threads that may help. In my case it was electrical noise messing with the ecm.


Follow this one to page two.

https://www.irv2.com/forums/f23/spee...ml#post2835874


https://www.irv2.com/forums/f23/tran...ml#post3951232
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Old 10-28-2021, 10:39 AM   #8
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Interesting Update

Have an interesting update on the status of my P0720 error code problem. Before I do that let me mention that in my initial description of my problem I failed to mention that I could also 100% of the time generate a blinking Overdrive OFF light and a P0720 error by simply backing up the RV. The error would always happen within seconds of backing up (not just shifting into reverse but you had to actually start moving backwards).
Of the several suggestions for actions to take to fix this problem, I decided to first take Senky’s suggestion to focus on the battery because it seemed the easiest 😊. So, I replaced it…it was old anyway. Immediately after replacing the battery we went on a weekend camping trip just 25 miles away. I stopped trying to prevent the error by driving such that I would not ever come to a dead stop. Actually I tried to produce the error by coming to a complete stop whenever appropriate. I was disappointed to find in the trip there and back, with numerous opportunities for error codes, I found no change. Everything I did that I expected would produce the error did.
Two weeks later we went on our next camping trip 150 miles away. During this trip there and back with many opportunities for error codes I found that I got error codes only about half of the time I would have expected. Hmmm…an improvement.
Two weeks later we went on another camping trip 200 miles away. On the trip there, with a lot of opportunities from backing up and making dead stops, I received error codes on only two occasions. Then, on the 200 mile return trip home with just as many opportunities to get error codes, I got NONE.
The most interesting part however is that well after I had changed the battery, while looking through the Owners Manual for my RV for a totally different reason, I ran across a section on “Maintenance and Care of the Battery” which said: “To account for customer driving habits and conditions, your automatic transmission electronically controls the shift quality by using an adaptive learning strategy. The adaptive learning strategy is maintained by power from the battery. When the battery is disconnected or a new battery is installed, the transmission must re-learn it’s adaptive strategy. Optimal shifting will resume within a few hundred miles of operations. Also, because your vehicle engine is electronically controlled by a computer, some control conditions are maintained by power from the battery. When the battery is disconnected or a new battery is installed, the engine must re-learn it’s idle and fuel trim strategy for optimum drivability and performance. The vehicle may need to be driven 10 miles or more to relearn the idle and fuel trim strategy.”
Is it possible that this “re-learning” process after disconnecting the battery has solved my P0720 error problem?! At this point it sure looks like it. I haven’t done anything else to the RV other than change the battery. Scott
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Old 12-15-2021, 09:45 AM   #9
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Fixed this code many times it's almost always corrosion at a connection and more than once a broken wire that was making an intermittent connection
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Old 12-23-2021, 08:34 AM   #10
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If you google 1999 ford f53 hard shift, you will get a Ford F53 TSB about changing the ground wires to the transmission. It cured the transmission problems on mine and waiter21 and many others.
I am surprised no one has brought this up. The tsb specifically says you might get a 0720 code.
The TSB is ford TSB 02-11-03.
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Old 12-24-2021, 01:35 AM   #11
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1) By erasing code/ SES, you erase the Transmission "self-learning" for shift points, probably causing the rough shifts you note, but 2) I also see P0720 can also be related to TRANS Temperature/ temp sensor/ sensor wiring, so I would look at that yourself, crawl under, locate, inspect wiring/ plugs closely, unplug/ reconnect, consider replacing sensor? or the trans output speed sensor? One sensor can be bad, and still have good wiring, so maybe will not know, until sensors replaced? Check Rock Auto vs local dealer for parts?
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Old 12-24-2021, 09:28 AM   #12
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1) By erasing code/ SES, you erase the Transmission "self-learning" for shift points, probably causing the rough shifts you note
That depends on how the codes are cleared.

If the codes are cleared by disconnecting the battery, then yes, the adaptive learning is cleared, too. If the codes are cleared by deleting them with a scan tool, then the adaptive learning is not cleared.
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