Ford 6.0L Power Stroke Diesel :: Transmission Started Shifting Badly - Codes P0976 And P0755
Aug 12, 2016
Recently picked up a 2004 Ex 6.0L. Drove great for a bit, then it started shift badly, then finally the Tow/Haul light came on. The original codes were P0976 and P0755.
P0755 being shift solenoid B, and the P0976 being SSB Control Circuit low. I replaced Solenoid B and that code went away.
P0976 stayed with no change in how the truck drives. Replaced the internal harness today, and again no change.
At this point I'm at a loss. I'm wondering if it's something between the PCM and the transmission?
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I was reading yesterday where someone was wishing for a tuner that would allow you to skip 1st gear. I realized today that you can do that in Manual mode and was even surprised to find out that it would even let you start in 3rd. Driving around without a load, 1st gear does seem a bit of a nuisance. You can't really get on the throttle until you get 2nd! Playing around with it a bit, starting in 2nd, and even 3rd around town was really nice and I didn't miss the shifts. The other thing I noticed that when in manual, it will down shift based on speed, but not throttle position, so if you're going fast enough, it will maintain that gear without downshifting as you apply more throttle. I'm assuming that Ford put some thought into this and won't let you shift in a manner that will cause damage. It would be nice, however, if it would bypass 1st if not in Tow/Haul mode and not make you do the manual shift thing.
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In my 2011 F-250, 6.7, auto....it seems that at certain times went the tranny shifts from 2nd to 3rd and I pause with acceleration, for some reason the tranny seems to go into a slip mode and then slams into 3rd. Now I read about 8 months ago that there was a computer upgrade via Ford. Which they did when I was having some work done on the truck at the dealership.
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I have a 2006 f250 6.0L with 76,000 miles on it. And it just started to shift softer then normal under light throttle. The first to second to third shift are softer then normal. And the third to fifth gear shift seems to have a lot of what I would call overlap and some times it feels like it is slipping. Gets better under hard acceleration but not as firm as it used to be. I have always changed the trans fluid and filter every 25,000 miles. Trans temp runs about 150 to 160deg. I checked the fluid today and it's bright red and does not smell bad. And I don't have any coeds. Could it be a solenoid going bad ?
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Transmission was not shifting out of second gear set a code stuck solenoid cleared code seems to be working now....
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Hauled my last 2 cord of wood for the season, and I now have a pretty good 3-5 slip in and an intermittent bang/clunk when its shifting. So I've put this off for a long while now, and I want to fix it. I've done my research, and I don't really feel like I'm any further ahead than before I did my research.
I'm looking for recommendation's on what transmission and or kit is the best for my truck. I pull my 5er 10-15 times a year mostly up and down the east coast. We are looking to get a new 5er with a bunk house, my goal is to stay in the same weight neighborhood, I run 13-13,500 now depending on where we are going. The goal is to be able to get maybe another 3-5 years of use from the truck, maybe more, and then upgrade to a newer truck. So let me hear what you all recommend as I'm going crazy and probably over researching what I'm gonna do...as usual.
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For those of you tuned and deleted......intermittent transmission shifting stutter is gone now? Mine sure is. Never once since the mods have I had that annoying stutter when the truck is cold and I'm easy on throttle between 2nd and 3rd gears. What a relief it is to have it shift NORMAL ALL THE TIME!!! Stutter no more after H&S Tune and Delete, for about two months now.
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When taking off the 1-2 shift and the 2-3 shift the truck will go into a neutral state for 2-5 seconds. when this occurs, the rpms will rev since your foot is on the accelerator. Once you let off the accelerator the rpms come down and the gear will catch. I have had the truck in the shop a few times without any luck. part of the problem is no codes are thrown so the dealer has no clue what to look for. This is extremely dangerous when in my case i pull out on a 6 lane hwy with 55mph speed limit. Ford more or less said to pound salt until a code is thrown or until something else happens. this nearly caused a nasty wreck 2 weeks ago.
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I'm having problems with my 6r140 in my 2011, the truck is an early build around 8/2010 I believe.
After cold soak when shifting into reverse after allowing engine to warm a bit the transmission almost always slams hard into reverse.
After that shifting from 1-3 is awful, the transmission will try to go into 3rd but downshift to 1st then fail to go back into 3rd multiple times. This situation is extremely dangerous when trying to pull into traffic.
Oh and once the transmission gets into 3rd it will skip 4th and go right into 5th. There is only 94k miles on this transmission/truck.
I just bought this truck about a month ago, does this sound like an issue with the solenoids in the valve body?
I'm very mechanically inclined and can swap them if need be but now we're talking few hundred in solenoids and then getting the trucks pcm flashed right?
Also fluid has been changed and I used mercon lv.
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I have a fleet of F250s and 350s through my business. I have recently been having problems with a f250 2015 6.7. It has approximately 110k miles and a new transmission was put it about 12,000 miles ago. Since then we haven't had a problem until now. Recently (2 days ago) it started blowing a fuse, #46 (transmission control moduler) and lighting the entire dashboard up like a Xmas tree.
Check engine light, maintenance required, hill descent, etc. However it is completely random when it does this. It has happened a total of 11 times in 2 days. 6 times in a row yesterday then didn't do it until late this evening 5 times in a row. It will get parked, turn it off, try turning it back on and the fuse is blown, replace it same thing... then will eventually start.
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Can I change these out to hydraulic hoses with clamps that are rated for the fluid. Mine are rusted and starting to leak.
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I have a 2007 f-250 6.0 liter turbo diesel. I was pulling a trailer with a golf kart on it and was not in tow haul. I was going up a hill and it shot up into 5th gear. I pulled into my house and shut it off and refired it and it acted fine. I went on a little test drive to see if it was going to do it again before I went on my trip. As soon as it shifted into third gear the tow haul light started to flash on my dash and went to 5th gear and would not down shift even if I did it on the column.
I scanned the truck with my snap on modus and it gave me these codes. P0706-transmission range sensor A circuit range/performance, P0707-transmission range sensor A circuit low input, and P1702-transmission range sensor circuit intermittent. I put a transmission harness in it and started it up and it ran fine and the codes were gone. I went for a test drive around the neighborhood and as soon as it hit 3rd gear it did the same thing as before. Today I put the old one back in and checked the codes so I could write them down and there weren't any so I went for a drive and it shifted through all the gears great and downshifted fine as well.
I pulled into my drive way to check for codes once again and there weren't any. I was gonna go for a ride in tow haul to see if it would do it and as soon I put the truck in reverse it started to idle high and the tow haul light started to flash again. I put it in drive to pull back into my drive way and it immediately shifted into 5th gear and threw the same codes...
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Truck pulls to the left while braking, pretty bad. So, pulled the front right wheel off thinking the pins are stuck again as last year. Bottom pin was fine, top pin pretty gummed up but not froze so I cleaned it up good, used thin layer of the good stuff, put back together and test drove........same thing. Pulls left upon braking just as bad as before. Caliper pistons seemed fine, didn't take much to compress them either. Would a right rear cause this?
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Is there an alert setting to signal when a regen starts? My engine stumbles badly a few seconds after a regen starts. The dealer hasn't found the problem. Right now I just keep an eye on the soot level gauge.
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I turned the key and it started to crank and slowly started to whine down. Tried it a 2 more times and it did the same thing only with less strength and on the third try all I hear is the starter clicking. Both batteries read 12.57 on my multimeter while not cranking. Does this sound like an alternator? All my electronics seem to have plenty of power.
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I spoke with a few people here before about my 4r100.. it threw a code a month ago for P0750.. i replaced solenoid and it continued to do it even after clearing codes numerous times.. then all of a sudden it was perfectly fine for over a week, no codes, i ran a few brick hauls with it and ran it for over an hour straight.. i went to fl and upon return i took her for a drive and wouldnt you know, the code has returned.. i did hammer down a little but not from a dig, i just got on it a little playing with a neighbor and his truck and all of a sudden it did its thing slipping and not up shifting then the O/D started flashing again... i cant understand why the code would come back all of a sudden, there has to be a wiring problem correct?
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When I'm at 60 mph and go full throttle, it doesn't seem to down shift enough and the torque seems low. But when I go 1/2-3/4 throttle, I get the power I'm looking for. I'll test it later today and see what gear it shifts to with both.
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Truck = 2011 F250 150,000 miles, no modifications, stock.
Truck lost power yesterday, no boost, and no codes. When driving on Friday, I started moving from a red light. The truck seemed very sluggish. Then I noticed it downshift going up a small hill that it never downshifts before. I looked, and noticed the turbo gauge at 0, no boost. I pulled over, turned it off, then restarted it, but still no boost, and the truck is very under-powered. I looked over the area, and do not notice any leaks, also no leaks underneath. I hooked up my OBD reader, and no codes., the boost gauge is on zero, and the truck has lost significant power. I no longer hear the turbo spooling.
I have spent the past several hours searching sites and forums (Started with FTE ), and it seems that most believe a restart of the truck has solved it for them. However, this is not the case for me, a restart, even after letting it sit overnight did not resolve the issue.
I did see one reference that replacing a NOX sensor solved their problem. This brings up some interesting truck history. Back in June 2017, my truck threw the following codes, P207F and P20EE.
P207F - Reductant Quality Performance
P20EE - SCR NOx Catalyst Efficiency Below Threshold (Bank 1)
The message said I have 200 miles until reduced power. Since it was a Friday, not much I could do at the time so I let it sit overnight, and then the next morning the message was gone. I plugged in the OBD reader and cleared the only remaining code (P20EE), and its been a very happy truck until yesterday.
So my question, can a bad NOX sensor cause the issue of loss of turbo boost, with no codes? Is there another possible cause?
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My wife drives a 99 ford expedition, 5.4, auto, 4x4, Sunday I am driving it and it wont upshift from 1st to 2nd unless I let off the gas or let it run up to 4000rpm. I have cel and blinking OD off light. I pulled the code and got a p0755 shift solenoid b. That is really the only symptom, the other shifts seem fine.
1st question, which transmission do I have? I believe it to be the 4r100, the pan has a "notch" in it. Looks like this... Fel-Pro TOS18714 - Automatic Transmission Gasket | O'Reilly Auto Parts
2nd question, if it is the 4r100 is there just a solenoid "pack" and not individual solenoids to replace? I found these...PowerTorque- TE140 - Solenoid | O'Reilly Auto Parts
PowerTorque - TE141 - Solenoid | O'Reilly Auto Parts
3rd question, what is the difference between the pwm and non pwm?
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2003 F250 6.0 ESOF - 4x4 and LOW lights on, TC not shifting
About the truck: 2003 F250 CCLB 6.0L 210k Miles
Heavy Duty Bulletproof Diesel Kit
Warn Front Manual Hubs (vac lines clamped/blocked)
Transfer Case Shift Motor/TCSM is off (I personally have not tested it and am still looking for what to test on it) or I will purchase a new one.
From seller: "What happened is, I accidently put it in 4x4 and when I turned the switch it would not go out. I had to limp it home slowly. When I got home I messed around with it, and could not get it to go back into 2x4. I removed the shift motor, and tested it. It tested ok. I shifted to back to 2x4 with a wrench and left it."
CURRENTLY the TCSM is off the transfer case and is in 2WD. Warn hubs are set to "FREE," seller also noted that this is how he has been driving it for quite sometime. TCSM is in 4x4 LOW, that is what I have to manually shift the transfer case to if I want to mount it up. I have been shifting it using a 14mm open end wrench and with the transmission in neutral. I have not tried turning the TCSM position manually.
Scanning using AE brings up different codes depending on transmission position and which scan is used:
P1812 4-Wheel Drive Mode Select Circuit Failure
P1819 Transmission Neutral Safety Switch Short Circuit To Ground
P1832 Transfer Case Differential Lock-Up Solenoid Circuit Failure
P1876 Transfer Case 2 Wheel Drive Solenoid Circuit Failure
P1865 Transfer Case Contact Plate Power Short to Ground
AE scanning for DTCs: P1832 and P1876
AE scanning using OnBoard System " SYSTEM SELF TEST" with transmission in PARK: P1812, P1832, P1876
AE scanning using OnBoard System " SYSTEM SELF TEST" with transmission in NEUTRAL: P1812, P1819, P1876
AE scanning with TCSM off: P1865, P1832, P1876
P1865 seems to be solved by simply installing the TCSM.
AE Live Data shows correct indicators for 4WD switch, showing corresponding drive mode in AE as the switch setting but nothing happens. No clunk/thud/movement. I have tried resetting the codes but the 4x4 and LOW lights both stay on. I tried it in park, neutral, engine off and engine on. I tried driving 5-10 mph to relieve any driveline wind up, I tried driving in reverse with front hubs free and locked, gave the same results in AE and no transfer case shifting.
Section 308-07A Four Wheel Drive Systems Pinpoint Test I
Found a thread with some fuses to check, I have checked fuses #19, 27, 31, 33, 34, 45 and 111 (with a multimeter for continuity),
Relays (first swapping the old ones, then trying new ones), I did the pinpoints from test I, and installed another GEM (same part number as mine but from a 2005 F-350)
Section 308-07A Four Wheel Drive Systems Pinpoint Test I led to my purchase of a used GEM, not knowing if it is good or bad, I have determined that I get the exact same codes for each AE Scan as the GEM that came with my truck.
I included a photo of my relay box, have any of you seen this type before? There is no other box in the engine bay with twin relays.
Air/Defrost switch works and routes air to switch setting. AC works, DEFROST works.
Could PVHS be causing a code from the manual hubs?
Could the MSS be causing a code even if it is showing correct in AE?
Should I try a new TCSM? Should I try turning the TCSM manually? How do I test, what do I test for on the TCSM?
I want to avoid taking this to the dealer if their own service manual and diagnosis is going to have the same results as my testing.
Where do I go from here?
Could PVHS be causing a code from the manual hubs?
Could the MSS be causing a code even if it is showing correct in AE?
Should I try a new TCSM? Should I try turning the TCSM manually? How do I test, what do I test for on the TCSM?
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Trans has new solenoids in the trans but is shifting too firm sometimes from 1-2 or 2-3.. It is tolerable going up, but when slowing down it jerks really bad from 2-1. Sounds and feels horrible for the trans and miserable during stop and go traffic. Ive had to switch it to Manual and start off in 2nd gear. Im deleted, with intake, and a custom sct x4 tune. My main question is there any way a new tune could have better shift points?
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