Question about 2005 GMC Sierra C/K3500
Torque converter clutch circuit performance
This code is related to the TCC circuit in the transmission. It is either stuck in the closed position (regulator valve, or control valve) or it has a bad torque converter. You will need to take it to a reputable transmission shop to have some fluid line pressure tests done. The cost of course will depend on the repair needed. Some parts of the repair for this are pretty simple and only require removal of the oil pan and valve body to access related parts, but if the converter has ballooned and needs to be replaced the transmission will need to come out for repairs. Most good shops are happy to give you a free written estimate, ask for one before you authorize any repair work. Could be rather simple, but could just as easily be complex, hard to tell from where I'm setting. Better to have it tested than to just start throwing expensive parts at it in an attempt to fix it. Most of these failures are caused by dirt, and things getting plugged up due to lack of maintenance.
Honda Service News November 2003 TITLE:
A/T DTC P0740, P0741 Repair Tips: Another Look APPLIES TO:
If you're doing a repair for DTC P0740 or P0741 (lock-up control system) on any Honda models with A/T, except Passport, refer to this table first:
If there is no S/B posted on ISIS for the vehicle you're working on, go to the DTC P0740 or P0741 troubleshooting procedure in the Automatic Transmission section of the appropriate S/M or under DTC Troubleshooting in ISIS. If the procedure recommends replacing the A/T, make sure you have a reman A/T on hand. Remove the original A/T, and look at the condition of the torque converter O-ring. Then follow these tips to ensure a lasting repair.
Missing or cut O-ring . If the O-ring is missing or cut, the ATF can leak internally, causing DTC P0740 or P0741 to set. Replace the O-ring, and reuse the original A/T. Make sure the problem has been fixed by connecting the HDS and testdriving the vehicle using the previous DTC P0740 or P0741 freeze data parameters (match the TPS and VSS values for at least 25 seconds ). If the DTC comes back, install the reman A/T. If the DTC doesn't come back, return the reman A/T to the reman center.
Flattened or deformed O-ring . If the O-ring is flattened or deformed, replace the A/T. The O-ring can get damaged if the ATF pump seizes up and overheats. Make sure the problem has been fixed by connecting the HDS and testdriving the vehicle using the previous DTC P0740 or P0741 freeze data parameters (match the TPS and VSS values for at least 25 seconds ).
O-ring is OK . If the O-ring is round and in good condition, the most likely cause for DTC P0740 or P0741 to set is the A/T, the torque converter, or both. Install the reman A/T. Make sure the problem has been fixed by connecting the HDS and test-driving the vehicle using the previous DTC P0740 or P0741 freeze data parameters (match the TPS and VSS values for 25 seconds ). Before you install the reman A/T, make sure the O-ring on the torque converter is properly installed.
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Posted on Feb 21, 2012
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Posted on Jan 02, 2017
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