Ford Super Duty (1999-2016) :: Auto Trans With A Flashing Tow / Haul Light And Code PO791 Coming Up
Apr 5, 2013
I have a 2007f550 auto trans with a flashing tow/haul light and a code of po791 coming up. Flashing light will clear in k/o position and remain off until placing selector in drive,after two feet or so of travel,an audible clunk and the trans acts like it is in third gear. Reverse is no change and highway will not shift into o.d. The iss "A" is listed as the culprit but ford doesn't list a iss a.
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Well I went about 20mi to pickup a door for my inlaws. Get about a mile from home and my tow haul light is flashing. Truck starts shifting strange then I smell it trans fluid. If course I get stopped by a red light shut it down. Started and had to rev to get it to move now four houses away from home coast into the drive shut it off and trans fluid is covering the entire bottom of my truck. Even the rear tires inside are covered. I had the wife crank it and I blew a trans line near the ext. trans oil filter. What are the chances that I did not toast my trans? No prior shifting or slipping problems before this mishap.
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I have a 2006 6.0. It's hard to put into to drive and for you to get it moving you have to just about floor it. The tow haul light is flashing but my bullydog won't pull the codes. It stops moving after like 30 to 40 ft after you got it moving and acts like it's in natural. If you turn it off and back on it sometimes will move another 30 to 40 ft sometimes. It also sometimes if you put it in reverse won't let you give it gas. Like you can push the pedal but the rpms won't climb for this reason I'm thinking something to with a solenoid or fuse or something along those lines and also because if you restart it will move again. I don't know much about transmission. I'm taking it to a shop tomorrow for them to try and read the codes. If they say the transmission is toast i already located another one 2 hours away to swap in which I'll do myself to avoid the high cost of the shop which also I'll look to yall for guidance. I drained some of the transmission fluid and didn't see any metal flakes. Should I pull the pan as well and look if nothing is coming out in the trans fluid ?
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I have a 2000 F350 7.3 4x4. It began giving intermittent tow/haul flashing light, when going up or down hill but would clear and drive next time truck was cycled off/on. No ABS lights and code reader generated P0720 for the output speed sensor, now I can get it to generate just driving slowly fwd and rev a few times. All of this has been in the last few days.
Truck will stall if I take it up a slight incline with the fault. I replaced the sensor on the top front of the 4r100 transmission and also replaced the sensor on the rear differential after giving up on looking for an output sensor on the transmission. I know the 2WD transmissions have an output sensor but is there one on the 4WD version? I have read several past threads discussing the P0720. I am hoping to confirm what sensor I need to be looking at and where it is located in this application.
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Just got the transmission rebuilt in my truck and other then shifting hard sometimes it has been doing great, Hooked it up to the goose neck this evening and everything was fine then went to back it up and pull it forward and after a short distance the od light was flashing and when i ran a check on it it was p0720? The transmission has less then 1000 miles on it?!?!? 1999 Ford F-250 7.3 Automatic....
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Looking for a diagram of where the transmission temp sensor is found ..... I have a 2005 f 250 5.4l FX4.... My tow haul light keeps flashing...
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So coming home yesterday from our camping trip the tow/haul light started to flash. this was about 40 miles into the trip. So we pulled over, the tranny fluid looked low, so I added a little more. The light stopped flashing, but maybe another 20 miles it started again, we pulled over and it stopped. We got to a rest stop and after about 20 minutes, I called Good Sams Roadside, there tech said to take it out of tow/haul mode and so we left the rest stop and it was good for just about 40 miles.
We hit another rest stop, at this point we were about 80 miles from home. I did not feel any difference in the truck shifting or if it was acting different. The light flashed again, sometimes going off, then coming back on. We hit two more rest stops, letting the truck rest. We left the last rest stop, we were already halfway up a big hill on the Mass Pike and after 5 miles the light came on, but then after a few miles it stop and from that point to my house ( which was just over 50 miles) it never came back on.
The truck is a 2006 F250 gas that just hit 100,000 miles. New motor put in over the winter and a few years back had the cam phasers and some work done on it. Could this be some sensors, etc that is starting to go and needs to be replaced?
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So I was driving my 2004 6.0 auto on the freeway today when the tow haul light randomly started flashing, nothing felt wrong until I stopped, then when I went to pull away it wouldn't shift down from 5th according to my livewire ts says under the commanded gear gauge. It shifts into 6 and overdrive fine. I turned the truck off, the light went off but as soon as I put it in drive it jumped around from 1-2-5 and back down until it locked in 5 again and the light started flashing again. What this could be?
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I have a 2004 F250 Torqshift trans, 155,000 miles. It has had a slight hesitation when trans is engaged for about 4 years, not a problem the dealer has no fix they said.
Now today for the first time I had a tow haul light come on while driving on the freeway. It would not go into overdrive and the light keep blinking. Later in the day, I let it cool down and it drove fine to the store about 2 miles. When I got in to drive home it had tow haul light go blinking and check engine light came on this time.
I hooked up my code reader and it's giving codes: P0720, P0751 and P0766.
Should I take it to the Ford dealer, a Transmission shop or have a friend who worked at Ford Dealer do the Work? I see that some people have changed out the TFT sensor and corrected the problem. While the pan is down should I just have all the shift solenoid sensors changed?
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I have the dreaded flashing O/D light on my early 99 F350 7.3 4x4 auto. The only one's that seem to be consistently recommended are Snap-On or AutoEnginuity.
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I have a 2006 F350 SRW 4WD 6.0 with 127000 miles on it. A couple of weeks ago it, pulling out of my driveway, it hesitated and tow haul started flashing. I had codes pulled and it showed P1780, P0751, and P2700. After turning off, codes were gone and tow haul off. Ran fine since then every day. Yesterday while going about 50 mph it started acting like it was in neutral (revving up), nothing happened when mashing the accelerator. Coasted to a driveway and truck would not move, only sounded like it was in neutral.
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I have a 2001 F250 Super Duty with a 5.4L engine, regular cab. The truck has 149000 miles on it. I bought it about a month ago and had the transmission rebuilt, the spark plugs and coils replaced. Apparently the shady dealer I bought the truck from had power washed the engine and there was water in 3 of the spark plug wells on the drivers side. When I got the truck back from the transmission shop and backed it out of the parking lot, the OD off light started flashing and the SEL light came on. The code showed to be a P0720 to which the mechanic at the transmission shop replaced the speed sensor on the top of the tranny.
He said if it comes on again then the speed sensor on the rear differential could be the problem and that he would have to charge me to replace that sensor since it isn't covered under the warranty for the transmission.. I replaced the sensor myself on the rear differential yesterday and thought the problem was fixed. I drove the truck around for 30 minutes with no problems, until I put the truck in reverse, then the OD off light started flashing and the SEL light comes on giving the same P0720 code.
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I just noticed that on the highway sometimes (3 times) the tow/haul light is lit. I press the button and it will not turn off and when I get off of the highway I can tell the trans is shifting through the tow/haul strategy. Once I shut the engine off and restart it the light goes off and it drives normal. When it is driving normal I can turn the tow/haul off and on with no problems but noticed the light coming on it's own recently.
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F250 7.3L diesel started to flash OD light, goes into limp mode, code p1747. No other codes. Have had issues for a couple of years where the truck would not shift into gear for awhile; sometimes a couple of minutes till it would engage. Have done lots of diagnostics. Visual check harness. Have 12v on pins 1&12 on harness at transmission plug. Plug had some ATF visible, but cleaned it up and continuity good. (with 4" exhaust hard to get to connector).
Checked all solenoid wires with a DVM back to plug at PCM for continuity and shorts, all good. Pulled transmission pack and checked resistance on all solenoids except temp varistor all within specs. Removed Banks Trans Command and rewired tranny plug and pulled Ottomind chip from PCM. Still goes into limp mode and throws code. Did not see any bad solder joints or burns inside PCM by the way.
Seems like PCM right? But here is a complication to my issues. For over a year I have been having electrical issues like the radio not working and windows not working intermittently after starting up. After running for awhile or on restart would work fine. Sounds like the Instrument Cluster issues or relays.(?)
Will be pulling IC and checking for any bad solder joints. However, did not throw p1747 till just recently and now my radio has really gone wonky. It comes on when key is on automatically and then proceeds to cycle through settings; AM-FM-CD.
So questions are, "Is it possible that a bad Instrument Cluster can cause a p1747 code?" "Bad Ground to Tranny" "Can a bad PCM cause a electrical issue in IC??" "Are these 2 separate issues?"
2002 f250 7.3L, 4R100 automatic trans, ~180,000miles
Banks Stinger package, 4" exhaust, TransCommand, (now removed).
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I have a 2006 F250 with the 6.0 PowerStroke and automatic transmission. I just purchased this truck at an auction about a month ago.
Today I notice the transmission is not shifting into overdrive. No warning lights. If I press the tow/haul button in no change but the tow/haul light does come on. If I press it again (to turn it off) the tow/haul light goes out but still the transmission will not shift into overdrive.
This leaves me at about 2000 RPM at 68 MPH. I just had a Ford dealer perform Transmission service last week. (20,000 miles after the last recorded service.)
I am already not happy with the service I received at the dealer so I am really hesitant to take it back to them if it is something not related to the transmission service they performed.
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This morning, the tow/haul light came on, tranny temp gauge wouldn't read (stayed below zero), "check gauges" warning came up on the panel, and "check engine" light came on. Truck ran fine/shifted fine, always has.
2007 F-250, V-10, 5-r 110 tranny.
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Experiencing a melt down with one of my trucks. One of our trucks is an 06 F250 SD with 80k on a 5.4L and the other day the tow/haul light started to flash. I took it to a buddy's repair shop (who is an experienced Ford tech and tranny guy) any way, it shifted fine until about the last 1/2 mile before I got to his shop, then it started shifting in and out of different gears. He found solenoid "A" pressure solenoid failure and one other solenoid failure, he replaced all 7 solenoids and also found the pigtail from the transmission to the wire harness bad as well and replaced that. I pick it up and get about a mile down the road and the light starts to flash again so I took it back, he ran his scanner and now found something with the coast clutch and through all his testing it told him the coast clutch needs replaced. He removed the trans. and tore it all down and found nothing wrong with anything, in fact he said everything looked in great shape and thinks the pcm failed.
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Had a No start issue.Turn the key and nothing. Could hear the relays click so knew it wasn't the ignition. Could jump the starter via the wire on the passenger fender so starter good. Replaced the clutch position switch last night. Still have no start but now when I press clutch I have a tow haul light come on dash.If I press it again it turns off. Truck doesn't have tow haul option installed. I hear a relay clicking under the dash too. This is a 2004 Superduty (F550). Replaced the ignition switch today and still same.
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I just recently got handed a 2005 ford f250 6.0 PSD from my older brother, new to the whole diesel game, well all of a sudden as i was driving down the road about 65 mph, trucks RPMS shoot to about 4K and tow haul light starts blinking as i start pulling over (still in drive of course) i realize i can't move anymore the trucks rpm just rev. In all gears it does not move i moved 1-3 D and R and nothing truck just revs. i had my father get under the truck as i shift from gear to gear and the linkage is moving back and forth on the transmission as i put it in reverse the reverse lights still pop on, I'm new to the diesel game...
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I've got a 2006 f250 with 160,000 miles, trans was rebuilt by previous owner about 10,000 miles ago. The tow/haul light started blinking yesterday, only blinks for first couple of minutes of driving and then stops. Service engine light popped on today as well. Won't have access to a code reader until tomorrow, but looking for some preliminary info...
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My truck started acting up the other day with a flashing Tow/Haul light and CEL. The codes for the transmission were P0752 and P2700. I swapped out the SSPC-A solenoid unhooked the batteries for an hour and there was no change.
I hooked up a 100lb oil pressure gauge to the 1/8"npt outlet on the side of the tranny. At startup it immediately pegged the gauge....forever, lol. The gauge is toast now. Upon starting is has oil pressure visible in the see through line of the oil pressure gauge. But....if you tap the throttle in park for a second, the line looses pressure (by seeing the oil go back toward the transmission). Without pressure, when you put it in drive, it takes about 5 seconds at idle to build pressure and engage. If you give it the slightest throttle before engagement, it won't engage.
Also, as probably expected, the transmission hunts a bit with rough shifting.
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