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Power Strokes
7.3 Tech
TCC code P0741 - need advice
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[QUOTE="mandkole, post: 1222522, member: 4630"] It still seems like the solenoid pack, but Id like better information. I drove the truck again yesterday into town and immediately had the TCC act up again, turning on/off as soon as the trans shifted to 4th on the interstate. After the first couple of on/off/on sequences, I turned on the lock switch and again drove with no additional unlocking issues-- trans temp never exceeded 155F. Just like before, due to PCM command activity that continued, the trans went into limp after about 3-4 lock/unlock events. The trans functioned fine (except with a firm default shift). Very similar to the old Diesel Innovations instructions, I use a green light to show when the PCM locks the TC. There is a red light to show when the override switch is activated. My issue is with the TC lock in 'on' position (grounded control wire overriding the PCM), according to the lock/unlock light the PCM continued to want to unlock the TC with any application of throttle from a cruise state. How does the feedback loop work that controls the PCMs need to run the TCC? With the solenoid pack plug full of oil, it seems the issue could be there, but the grounded signal needs to go through there as well, so Im not sure. What is the PCM detecting that causes it to want to unlock/lock the TCC even though it cant due the override switch being on? I want to be sure Im troubleshooting this properly but Ive had other trans experts tell me that this is one of those situations where I need to just replace the solenoid pack. I was hoping to understand this a little better to know for sure. Who is the best source to get the pack from? [/QUOTE]
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TCC code P0741 - need advice
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