Ford Super Duty (1999-2016) :: Transmission Overheating A Bit - Codes P0741 And P0743


May 31, 2015

For the last few weeks I have noticed my transmission overheating a bit, nothing bad, but I have just been running around town local so no drives over about 15-20 mins.

Well, Friday night I went out to see a friends band play about 40 mins away, My trans temp climbed steadily the whole way out there, peaking at 226 by the time I got out there. I kinda took my time getting home hopping bars to give the trans a break to cool off.

Did some diagnosis today, first thing I did was unhook the line going to the rear of the transmission and did the bucket flow test. I fired it up and fluid came pouring out of the line which goes into the rear of the trans, nothing really came out of the rear of the trans, it was all out of the line.

So that tells me that its getting flow through the coolers. I didn't measure the amount like some do, but I can tell you it looked like a strong steady flow.

I made sure the fluid levels are proper as well which they are, it was maybe a 1 quart low which shouldn't effect anything. I also inspected the coolers and everything appears to be clean with no airflow restrictions. Took it out for a brief drive again and it climbed up to 147, maybe 5 miles out 5 miles back. Ambient temp is 62 today.

I am getting multiple codes on my Edge Evo which I have had set to stock settings since I bought the truck. Codes I get that concern me relevant to the trans are P0741 and P0743. Both seem to relate to the torque converter.

I feel like my RPMs are a bit to high at highways speeds so I am wondering if I have a TC that is slipping a bit while driving. I did notice a bit of a metallic pearl in the fluid that came out. Aside from that I feel like the trans is shifting ok, though sometimes I have to let off the gas to get it to shift into 4th.

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Ford Super Duty (1999-2016) :: Getting Code P0741 - TC Isn't Seated Properly?

99 F350 7.3l with 4R100 trans. About a month ago I took out a monster trans that had about 60k on it and it was burnt up. No warranty. ..customer bought another monster. After the install when going into 4th the torque converter would instantly lock making it feel as though the truck was falling on its face. Monster had me do some data logging and from the info I provided they determined it had a bad solenoid pack. They sent a new one out...when I went to install the new pack I noticed when I dropped the pan that the fluid was iridescent looking...a bolt for the valve body was in the bottom of the pan and lots of material stuck to the magnets....

Needless to say that trans only lasted about 2 weeks after putting the solenoid pack in. Fast forward to today..got trans number 3 from monster under warranty. After the install everything seemed good. About 30 mins into highway driving the od light starts flashing. ..subsequently the P0741 code. I did put 2 new wire pigtails on the front and rear speed sensors. The pigtails were a ford service part but they were a bit different in design. I am pretty sure the wires are correctly oriented..if not would this cause the issue. I really am leaning towards a bad solenoid pack again. My buddy thinks the TC isn't seated properly....where do I start? Also has an edge programmer on it..but it's been on the same map all this time

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I got AE hooked up on his rig.

When I pull (ALL) codes this is what I get:

When I pull (Current) codes I get this:

I tried to clear the code and the light stopped blinking, but he said it started blinking again on the way home.

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