Tcc solenoid code

It is located near the fuel tank on a tray under the car.

Hi, The PO742 is a transmission code representing the Torque Converter Clutch (TCC) release switch. To throw this code, there is either an electrical, mechanical, or hydraulic issue.

If you are extremely mechanically inclined, you will need to check the TCC solenoid, verify the connections of internal wiring harness, and perform an overall diagnosis of the transmission's condition, which will require removal of the transmission.

Given that you have a 4T65-E Transmission I would highly recommend taking it to a good transmission shop, this is not a 'quick' fix issue. Good luck and Godspeed.

If A/C fuse blows open you have a short to ground, youll need to inspect the wires if wire and connection are good then your problenm is the clutch of your A/C shorting internally, youll also need to know if the
A/C compressor is failing internally

you probably have a open or shorted tcc solenoid in the transmission.

P1860 TCC PWM Solenoid Circuit Electrical (GM)
this is a code saying the overdrive lock up soleniod
is not working properly

The code is for a TCC (Torque Convertor Clutch) solenoid problem.

Chances are pretty good the problem is the wiring where it goes into the transmission or the TCC solenoid itself which is in the valve body

There was a bulliten released from Ford about three years ago about this code being set after trans overhauls. In Ford's program stratagies, the P07xx codes are for computer detected failures due to mechanical responses. The P17xx code series are computer identified electrical failures. This code you are getting gets set when the computer does not see the what it would expect from Torque Converter lock-up. The most common problem for this (and is even stated in the bulliten I mentioned) has to do with a seal on the input shaft of the trans. The seal either gets damaged when the torque converter is installed or it is accidentally left out during the rebuild. There is not much that you personally can do, but at least you can understand how to best procede.

But you will most likely end up removing that cover to inspect the harness that goes to all the solenoids and then to inspect the valve body and the TCC solenoid itself. If you have a multimeter then you could ohm through the harness and even the solenoid. I have found that most of the time this code was produced because of the solenoid itself. But it could be the circuits to it also. There is a big connector an top of the trans that goes into the trans and the internal harness inspect that connector for any corrosion or damaged pins or wires.

TCC solenoid circuit failure during on-board diagnostic.

TCC solenoid circuit fails to provide voltage drop across solenoid. Circuit open or shorted or PCM drive failure during on-board diagnostic.

Failed ON - engine runs rough/vehicle shudder, engine stalls in DRIVE (2nd, 3rd or 4th) at low idle speeds. (Short circuit).
Failed OFF - torque converter clutch never engages (Open circuit) (MIL on).

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code - po1860 tcc pwm solenoid circuit malfunction 4t80- E conditions.5 possible causes 1. tcc solenoid control circuit is open or shorted to ground. 2.tcc solenoid control circuit is shorted to system power b+. 3.tcc solenoid power circuit is open check the trans fuse. 4.tcc solenoid is damaged or has failed. 5.pcm has failed.

Replace the TCC (torque converter clutch) solenoid in the transmission.

Code P1887, as you probably by now know, is set when there is an issue with the torque converter clutch engagement and disengagement. When this code is set, it inhibits TCC operation, could cause issues with the shift adaptive strategies and possibly issues with 4th gear (Overdrive) operation.

The unfortunate news is that you have the 4T65E transmission in this vehicle and the TCC switch/solenoid is part of the valve body and the valve body is on the side of the transmission (drivers side) and would require at least the lowering of the sub frame to get enough clearance to remove the side cover and to get to the valve body. It is really an involved repair and would not be for the faint of heart nor those with little to no mechanical experience.

I dont know where you are located, but if you are anywhere near Indiana I would visit www.grandprixforums.net and sign up there and post up your issue there. Its an online community for Grand Prix's and other vehicles that use the GM 3800 engine. There is a gentleman on there that goes by the screen name of Trannyman95 and he makes his living rebuilding 4T65E's among others and is highly regarded as a top notch transmission builder.