Output speed sensor 2004 6.0
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Mountain Pass
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Output speed sensor 2004 6.0
Hey guys, I was having some issues with my transmission. I have a 2004 f-350 6.0 with a automatic transmission. My original transmission went bad so I got this one and it’s from a 2005 f-450 I used all my sensors and wiring from my old tranny.I got it put in, it reversed good and I started to drive forward and got maybe 50 yards and the tow haul light started blinking, it idled just under 1000 RMPS and has a hard time shifting. I ran codes and I got a p0720 output speed sensor insufficient input. I thought it was the sensor so I replaced it and the same thing happens, is there anything that changed like maybe it’s not the correct sensor? Does my truck need to be reflashed so it will talk? Any help would be great, thank you
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Mountain Pass
Joined: Jan 2022
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@bismic i looked at the connector and as much of the wiring I could without messing with the entire loome and didn’t see anything wrong. Could it need reflashed so it will talk or do you not have to do that when installing a new tranny? Or is it just a wiring issue, I’m not sure where to start taking things apart at
Fleet Owner
Joined: Nov 2003
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I am not aware of needing any re-flash to establish communication.
I hear you on not seeing any wiring issues, but unfortunately it could be anywhere in the harness. You might considering installing a new wire (make it a parallel wire temporarily) from the sensor to the PCM. This wire will connect to the RIGHT connector of the PCM (C1381b) - ie closest to the radiator. In my 2006, it is pin #28 of C1381b (dark blue wire with a yellow stripe).
Or better still - do a resistance test on the wire (from PCM to the sensor)!
I hear you on not seeing any wiring issues, but unfortunately it could be anywhere in the harness. You might considering installing a new wire (make it a parallel wire temporarily) from the sensor to the PCM. This wire will connect to the RIGHT connector of the PCM (C1381b) - ie closest to the radiator. In my 2006, it is pin #28 of C1381b (dark blue wire with a yellow stripe).
Or better still - do a resistance test on the wire (from PCM to the sensor)!
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Mountain Pass
Joined: Jan 2022
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@bismic I wasn’t aware of any re-flashing needed either, but I don’t know that much about transmission, I just wanted to check with someone that knows a little more. OK I will do a resistance test and see if I can figure something out there should be little to none resistance correct?
I took it for a drive just to see what it would do, if I shut the truck off and turn it back on the light goes off and it drives like normal until I shift into second gear, then it starts idling funny and the light starts blinking and everything. I shut it off and restart it and it does just fine going in first gear. Is that just the system resetting and not having an issue until it Has to think of what to do and then find that error?
I took it for a drive just to see what it would do, if I shut the truck off and turn it back on the light goes off and it drives like normal until I shift into second gear, then it starts idling funny and the light starts blinking and everything. I shut it off and restart it and it does just fine going in first gear. Is that just the system resetting and not having an issue until it Has to think of what to do and then find that error?
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Mountain Pass
Joined: Jan 2022
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Okay I will try and find some long enough leads to test it all, I need to test all 3 wires that leave the connection right? Or just the one you said about?
im not sure either why it only does it when it goes into second for the first time and when I shut it off it resets maybe
im not sure either why it only does it when it goes into second for the first time and when I shut it off it resets maybe
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Fleet Owner
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The Pink wire with White stripe is the buffered 12V power to the sensor. Even though it is 12V, it is still called a reference voltage. It ties to Pin #1 of C1381b. quite frankly if there were to be an issue with this wire, you would probably have other problems/codes.
The Black Wire with White stripe is called the signal return, but it is functionally a ground. It also shares other circuits. It connects to pin #22 in C1381b. Again, it would probably cause other codes if it had an issue.
The circuits shared as mentioned above, are sharing with the Transmission Range sensor and the speed sensor assembly (turbine shaft speed and Intermediate shaft speed).
No harm done in testing them all though.
Couldn't answer your "why" question. I am only following the code, and proposing some basic checks because of the code.
The Black Wire with White stripe is called the signal return, but it is functionally a ground. It also shares other circuits. It connects to pin #22 in C1381b. Again, it would probably cause other codes if it had an issue.
The circuits shared as mentioned above, are sharing with the Transmission Range sensor and the speed sensor assembly (turbine shaft speed and Intermediate shaft speed).
No harm done in testing them all though.
Couldn't answer your "why" question. I am only following the code, and proposing some basic checks because of the code.
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Thread Starter
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Mountain Pass
Joined: Jan 2022
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Okay I’ll try and make sure all of the wires are good, if I where to run a separate wire I would just cut the dark blue wire at the pcm and connect a separate wire to the sensor and that should be all?
it’s okay I really appreciate all the help your giving me
it’s okay I really appreciate all the help your giving me
Fleet Owner
Joined: Nov 2003
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If it is bad in the resistance test, cutting the wire and adding a new/separate wire is probably the easiest way to go. Some people replace the harness, but that seems extravagant to me. Finding the problem is the best thing since it may be rubbing against something and other wires may be "at risk". That may not be easy to do though.
Adding the temporary wire is probably a "last resort". I hate cutting wires unless I truly know the circuit is bad.
Let us know the results of the resistance test before cutting wires.
Adding the temporary wire is probably a "last resort". I hate cutting wires unless I truly know the circuit is bad.
Let us know the results of the resistance test before cutting wires.
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Mountain Pass
Joined: Jan 2022
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Likes: 11