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I have a 2006 Nissan Frontier with 142k miles on it. Its 4.0 V6, automatic, RWD. I have only had the truck for about a month. I was driving down the highway tonight doing about 75mph and the "service engine soon" light came on. The truck was behaving completely normal. I got it scanned and Code P0744: Torque Converter Clutch Circuit Intermittent is what came up. I googled the code and it seems like there is very little info on how to fix it. Does anyone on here know how I should go about diagnosing it?

Thanks!
 

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The factory service manual has the basic diagnostic procedure for your code in the automatic transmission chapter. You can download the manual at Nico Club's website. One problem that is becoming more common on the RE5R05A transmissions is intermittent open circuits caused by broken pins in the TCM. The TCM can be repaired if the pin is broken. It is sold as part of the valve body assembly, with Dorman Products is now offering in the aftermarket. Here are some links that show the broken pin issue, which can cause a number or codes, depending on which pin breaks:


 

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Discussion Starter · #3 ·
The factory service manual has the basic diagnostic procedure for your code in the automatic transmission chapter. You can download the manual at Nico Club's website. One problem that is becoming more common on the RE5R05A transmissions is intermittent open circuits caused by broken pins in the TCM. The TCM can be repaired if the pin is broken. It is sold as part of the valve body assembly, with Dorman Products is now offering in the aftermarket. Here are some links that show the broken pin issue, which can cause a number or codes, depending on which pin breaks:

https://www.youtube.com/watch?v=GAveITCubOQ&t=579s

https://www.youtube.com/watch?v=Na1bUV03A_g
Thank you for the info. I watched through the video and looked at the service manual and I see that one of the solenoids is for the torque converter clutch. I guess I could have a broken pin there just as easy as the brake solenoid in the video. Do you know if there is any way to confirm that the intermittent connection is indeed in the TCM before I drop the pan and the valve body? Thanks again.
 

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Perform the diagnostic procedure for the P0744 code as is listed in the factory service manual for your vehicle. Keep in mind of the broken pin issues if testing shows an open circuit for the TCC solenoid. It is possible to have a faulty solenoid; Nissan doesn't sell them and only makes available the TCM/valve body assembly. You can sometimes, however, find the solenoid online, but they aren't easy to find. Before I would purchase a solenoid (if the diagnostic testing shows an open circuit), I would remove the valve body and check the pins as described in the video above. A lot of people have replaced the solenoid(s) thinking that was the problem never knowing about the issue of the TCM pins breaking. They discover after replacing the solenoid and putting everything back together that it doesn't fix the problem in most cases.
 

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Discussion Starter · #5 ·
Perform the diagnostic procedure for the P0744 code as is listed in the factory service manual for your vehicle. Keep in mind of the broken pin issues if testing shows an open circuit for the TCC solenoid. It is possible to have a faulty solenoid; Nissan doesn't sell them and only makes available the TCM/valve body assembly. You can sometimes, however, find the solenoid online, but they aren't easy to find. Before I would purchase a solenoid (if the diagnostic testing shows an open circuit), I would remove the valve body and check the pins as described in the video above. A lot of people have replaced the solenoid(s) thinking that was the problem never knowing about the issue of the TCM pins breaking. They discover after replacing the solenoid and putting everything back together that it doesn't fix the problem in most cases.
I finally got time to dive more into this, but I have not been driving my truck since this issue arose. I cleared the code just to make sure that it wasn't a fluke and it did not come back until I drove the truck on the highway for some time around 70 to 80mph. I have reviewed the service manual and the first 2 steps involve a CONSULT-II scan tool. Is there a manual way to do this without the scan tool, or would it be best to take it to a Nissan dealership/shop?

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If there is a way to do it without CONSULT, it is usually listed in the FSM diagnostics. There are other scan tools that can do the same thing, so you are not strictly limited to a Nissan dealer, but you want to make sure that the shop you take it to (if you decide to go that route) is competent enough to do the job. A transmission shop may be a better choice.
 

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Check the underside your radiator cap for Pink Milkshake.

A new radiator and transmission costs $4300 to $4500 from the dealer.
Ask me how I know. :frown:
 
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