Transmission code 01-P0741

[Lawn Guy]

Had my 1999 automatic transmission rebuilt ! I have taken it back twice , both times they have worked on it , last time replaced the torque converter and 3 switches or valves in the tranny , drove about 12 miles and it is giving off same code 01-P0741Torque Converter Clutch Cir Perf/Stuck Off
Any help on this one ? They seem to be stuck , this is my work truck , my bread & butter , killing me and my family !

1999 F250 4x4 7.3 automatic

[Mike OB]

PO471 is a genareic code, It should have another code as well, ask the tranny shop if they have another way to read the codes there should be a code that starts with P1 rather then PO - the P1 codes are factory codes and give more information. Tell them to try and enter the vin number rather then just OBD 11 into their scanner. I will go by my shop tonight and pull up your code and see what it tells me might be the problem. A torque converter code won't stop you from driveing it, It just won't lock the converter and more then likely it will fall back into a perprogramed operating stradige - poor fuel mileage. I will get back to you when I see what my data base tells me about that code. Mike OB

[Lawn Guy]

I was told they had an upgrade for the 1999 computer , not sure on this one trying to get more info and maybe have the chip re flashed !?!?

To through another curve I have a Super Chip installed , My mechanic says the only other code he has found is one pertaining to the cam and the chip !

Yes I am losing mileage , seems to shift into OD but with the slightest acceleration it drops back down to 3rd

[Mike OB]

Ford has had a number of up grade flashes for there computers-(PCM), The only thing that will set a cam code - is a bad sensor. Take a look at my post 4R100 and print it out to give to your tranny shop. You can also give him this one. The TCC is controlled by grounding the solinoid to turn it on. This is not a true ground it is a pulse width modulated signal, that makes it controlable so they could soften the lockup. I just thought of something. IS YOUR TRUCK BUILT IN CANADA? Look on the drivers door and see where it was made. then let me know. Mike OB
Ok I went down to my shop and printed out the info. I needed to help you. PO741 is a problem with the control circuit only. The test pointed out to find the problem is a circuit test from the PCM to the tranny and test the circuit from the power feed to the tranny, if both are good do an ohm test through the transmission itself. PO741 is only a circuit problem, there is nothing wrong with the transmission - except maybe the resistance is incorrect for the lock up solinoid. If they enter diaonosgtics with a vin entery or go into the star tester they should be able to get factory codes - a code of P1744 indacates torque converter performance problem. When I said that a cam-(KAM) sensor is the only thing that will set that code, I should have said if the connections are good. Good luck MIke OB PS if they still can't find the problem let me know and I'll give you my phone number to let them call me.

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Last edited by Mike OB : 12-11-2005 at 10:07 AM. Reason: the rest of the story

[Lawn Guy]

I checked out the driver's door it is in Fench & English but does not say where it was made !
It was a FL. rebuilt and has a sticker by the hinge on the door frame , maybe it is covering something !?

[Mike OB]

If it is in French and English you can bet it came from Canada - I have found by talking to a number of injections shops that the Canada built trucks have a problem with fuel mileage from the start. Mine came from Canada also and was getting 11 mpg no matter what I did. I found that the wire harness splices are poor connections and it does funny things to the way it runs. Do you have a freind or a good mechanic with some patience? You need to test the outputs to all the sensors, it is a 5-volt steady current from the PCM. Unless you have a good wireing diagram and understand what you are doing don't try and test it yourself. The IDM puts out over 100 volts and will fry your what ever. You being what-ever. The transmission torque converter will unlock if it believes the BOO switch is touched or if the TR switch gives the wrong signal. The MAP sensor tells the PCM what the load is and if it lies to the PCM it can make it unlock also. Mine had the MAP sensor problem and I doubled the mileage when I fixed it. Are you good with electricity or do you know someone who is? Let me know Mike OB

[Lawn Guy]

Why would this problem show up now ?
I had no problem before the transmission went south !
As for fuel mileage , pulling a 6,000 lb. trailer most of the time I was getting 9.9 mpg after I installed the " Super Chip " it went up to 15 mpg , lot more power and torque and seemed to shift properly for the first time when I run the cruise control pulling,not bad and everything was working fine for about 3 months , my truck has about 159,000 miles !
The Super Chip removes the factory data and gives 3 choices of programs to install , it was my and my transmission shops belief that this would equal or surpass and factory up grade !
So I would think maybe the wiring might be the problem, they also mentioned a $150 part that might be the problem ! can't remember what it was , if I don't have it on paper these days it is gone

I must say I am disappointed if wiring is the problem , being Canadian and spending 14 years working for Dana in Canada and knowing for a fact our tolerances are set closer , our production & quality expectations are also set higher then in the USA and all this for less money and Canadian money at that , that is why Canada wins these contracts , how ever I also know that Dana now farms out a lot of its production to china , Mexico and other country's so the parts quality is not there , I remember seeing bearings coming in from Taiwan being put in boxes and sent on to Ford ,GM, etc. and the box saying made in the USA , they where not lying the box was made in the USA my 2 cents

Seems the harder I try to live " The simple life " the more complicated it becomes
Thanks for your input, You can be sure we will put everything you have advised to the test and I will post our findings

[Mike OB]

My oldest daughter just brought her ford expidition in and told us her headlights where blinking and sometime didn't want to stay on. After a careful exam I found that the plugs at the headlights where melted. I also found out that Ford stocks new plugs to replace them with because it is a very common problem. So then I tried to figure out why it was a common problem. This is what I learned. My truck and her car where built in CANADA. The wire that runs to the headlights on her car is 22 gauge and mine is 22 on low beam and 16 on the ground and high beam. I checked an American made Ford that was in the shop and found that there wire to the headlights is 16 and 14 gauge. I can see why Canada can underbid us and why everybody has trouble with canadian built units. So the next time someone ask what is the differance between American and Canadian built units you cand say that Canada built units weight less but its only because it has less copper in the wire harness. Good Luck Mike OB

[Lawn Guy]

Well Mike I can't say, I have been in the sunny south since 1981 , but if you are trying to start a war with Canada you need to understand the bottom line to anything that comes out of Canada from an American Company must pass American Standards including the drugs from Canada,
American Company's !
So bad mouthing Canadian Made is only badmouthing
" American Quality control " My Thoughts !

We tested all the wires on my truck yesterday I helped as I would like to get back to work , they all tested out OK , then with the owners permission I swapped computers from his truck a 2000 , after driving 10 miles it gave off the same code , the boss let me drive his truck home and is planning on changing the solenoid pack today , we both hope this corrects the problem !

[Mike OB]

My wife was a Canadian and we have a ton of family up there. We have taken all 10 grand kids up to canada to meet all the family - not starting anything. If you can drive it with a scanner on it see if the boo switch changes as it drops out of converter lockup. Also watch the TFT and see if it has a jump at unlock, I believe the same power feed supplys power to all of it. I will look at a wire diagram today and see how it is wired to make sure I am right. Her is something I have taught all my mechanics "ASK FOR HELP FROM GOD AND MEAN IT" Good luck Mike OB