Question about Cars & Trucks
Code po741 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
U have a problem with the electric transmission torque converter clutch, to repair this requires the removal of the transmission, and in most cases a new torque converter.
Posted on Sep 18, 2009
unfortunately this means you need to get yourself to a trusted transmission repair facility very quick. the torque convertor on your vehicle is not operating the way it should. this is going to be an expensive repair, i tell you this so your not suprised. but do your homework and find someone with a great reputation for their work. dont take your saab to just anyone. these cars can get really screwed up without the right people workin on it. the transmission will need to come out.
Posted on Jan 06, 2010
Hi, the likely problem is that your torque converter clutch (TCC) solenoid has failed and will no longer engage the clutch. However, it may be worth a try to have your transmission fluid flushed and the filter replaced, if you haven't done that recently. There is some small chance that will fix the problem. The TCC is a device in the transmission that locks the engine to the transmission once you reach highway speeds of at least 25 mph or higher. The purpose of the clutch is to conserve fuel and reduce heat in the torque converter. The car will run fine without the TCC, but will get slightly less highway mileage. There is no harm or safety concern with driving the car as it stands now. However, if you intend to keep this car and drive a lot of highways miles, it may be worth the expense to have it repaired. (you could check your mileage to see how it's doing without the clutch) The repair should be done by a transmission expert, as there are several possible reasons it has failed--I'm only guessing it's the solenoid but would HAVE to troubleshoot to be sure. The repair can be done by any reputable transmission shop--it does not have to be done at the Cadillac/GM dealer. That said, I do recommend you shop around a bit if you want to have the car repaired, as there is considerable variation in the approach to this repair. It is possible to replace the solenoid without removing the transmission, but some shops may claim you need a complete rebuild. Make sure to tell them your trouble codes--that was very helpful to me. Please let me know if you have any questions, and thanks for using FixYa.
Trouble Code: P0741 TCC System Stuck Off - Mechanical (4L80-E)
ATF level is too low, or the fluid is burnt or contaminated Inspect transmission lines to radiator for bends or restrictions Oil pressure screen is clogged or debris in the oil pan TCC control valve is stuck "off" due to sediment or binding TCC regulator valve is stuck "off" due to sediment or binding TCC feed valve is stuck "off" due to sediment or binding TCC solenoid valve O-ring or turbine shaft seals leaking or cut
Trouble Code: P1860 TCC PWM Solenoid Circuit Malfunction (4T80-E)
TCC solenoid control circuit is open or shorted to ground TCC solenoid control circuit is shorted to system power (B+) TCC solenoid power circuit is open (check the TRANS fuse) TCC solenoid is damaged or has failed PCM has failed
Posted on Jan 03, 2011
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