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2000 caddy deville 4t80e transmission i have two codes in it po741 tcc performance or stuck off p1860 torque converter clutch pwm solenoid circuit what could be the problem

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  • jackilarue Jan 03, 2011

    fluid level is right and fluid is red when codes are cleared i can drive the vehicle on the highyway for about 30 miles before they are set agian . is there any way to check to see if the pcm is no good

  • Anonymous Mar 16, 2014

    2000 kia sephia torque converter clutch silenoid


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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)
Possible Causes:

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)
Possible Causes:
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

  • Jeff Turcotte
    Jeff Turcotte Jan 03, 2011

    Hi, based on that behavior, I would say the PCM is fine. What the PCM is doing is trying to engage the TCC and it is reading the current/voltage on the TCC solenoid circuit. The PCM knows what these values should be, and it is seeing something different. One way to verify this is to measure the signal yourself. Unfortunately, I do not know exactly what the PCM signal should look like, and you would need an oscilloscope to verify that it is correct, but you can at least see if the signal is there. You would have to jack up the drive wheels and run the car in gear to allow the normal sequence of events that lead the PCM to engage the clutch. Once you reach 45 mph, it should definitely be engaged. The solenoid is powered by the ECM fuse and receives it's ground signal from the PCM through pin 46. What you could do is connect an AC voltmeter between the battery positive terminal and pin 46 of the PCM. If it's easier, you could back-probe the tan wire at the transmission connector rather than at the PCM pin. The voltage should be zero until the PCM tries to power the solenoid. This will not tell you if the solenoid is working, but is an indication that the PCM is working. By the way, if you decide NOT to repair the TCC, I recommend you cut the Tan/black wire from pin 46 to prevent the operation of the TCC solenoid. Your engine light will remain on, but the system will not try to engage. Please let me know if you hav more questions.


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I have a 2001 aurora and code p1860 p1860 came up what is this and how much to fix

P1860 All GM - TCC (transmission Torque Converter Clutch) PWM Solenoid Circuit Electrical.
P1860 Description The Torque Converter Clutch Pulse Width Modulation (TCC PWM) solenoid valve controls the fluid acting on the converter clutch valve. The converter clutch valve controls the TCC application and release. The solenoid attaches to the control valve body within the transmission. The solenoid receives ignition voltage through circuit 239. The Powertrain Control Module (PCM) controls the solenoid by providing a ground path on circuit 418. Current flows through the solenoid coil according to the duty cycle (percentage of ON and OFF time). The TCC PWM solenoid valve provides a smooth engagement of the torque converter clutch by operating during a duty cycle percent of ON time.
When is the code detected? When the PCM detects a continuous open, short to ground or short to power in the TCC PWM solenoid valve circuit, then DTC P1860 sets. DTC P1860 is a type B DTC.

Possible causes - Faulty Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid
- Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid harness is open or shorted
- Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid circuit poor electrical connection. Unless you have a factory manual and very good auto repair skills this is best left to an expert. It is a messy dirty job that requires removing the parts inside the transmission for testing..

Aug 23, 2016 | Cars & Trucks

1 Answer


Possible causes
- Faulty Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid
- Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid harness is open or shorted
- Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid circuit poor electrical connection

Aug 28, 2014 | Cars & Trucks

1 Answer

PO741 is off and what does this code mean

code p0741 refers to torque converter clutch (TCC) solenoid ---performance or stuck off ===causes --wiring ---TCC solenoid

Feb 14, 2014 | Cadillac Cars & Trucks

1 Answer

Code p1860 comes up when I scanned a 2000 Isuzu rodeo. can you help?

That code indicates a TCC PWM Solenoid Circuit Failure (torque converter clutch pulse width modulation (TCC PWM) solenoid valve controls the fluid acting on the converter clutch valve):
is where I found that information.
I hope that will help.

Dec 13, 2011 | 2000 Isuzu Rodeo

2 Answers

2005 Chevy Equinox P0742 & P0700 problems. My car engine flares and sometimes doesn't change gears. Anyone know how to fix these issues.

Both codes (obviously) point to transmission related problems. The DTC P0700 means Transaxle Control System Fault Conditions and the DTC P0742 code means Torque Converter Clutch (TCC) - Stuck On.

The DTC P0700 code is for information only and the next step is to check for transaxle codes in the Transaxle Control Module (TCM). So you'll have to have the dealer or another qualified shop/technician pull the transaxle codes from the TCM and go from there.

On DTC P0742, Torque Converter Clutch Solenoid Valve (TCC Sol. Valve) is a normally-open exhaust valve that is used with the Torque Converter Clutch Pulse Width Modulation Solenoid Valve (TCC PWM Sol. Valve) in order to control fluid acting on the converter clutch apply valve. The TCC Sol. Valve attaches to the transmission case assembly extending into the pump cover. When grounded (energized) by the Vehicle Control Module (VCM), the TCC Sol. Valve stops converter signal oil from exhausting. This causes converter signal oil pressure to increase and move the converter clutch apply valve against spring force and into the apply position. In this position, release fluid is open to an exhaust port and converter feed fluid fills the apply fluid circuit. The converter feed fluid applies the TCC. When the VCM no longer provides a ground path, the TCC Sol. Valve de-energizes and apply fluid exhausts, releasing the TCC.

Condition: Some customers may comment that the transmission shifts hard, a shudder/chuggle is felt on deceleration or the Service Engine Soon (SES) light is illuminated.

A technician may find DTC P0742 set. Customers with 4T80E transaxles may also comment on a "bump" feeling at approximately 61-68 km/h (38-42 mph) when they lift and then tip into the throttle. There may also be a concern of whine noise in 3rd or 4th gear with or without the Service Engine Soon light/message displayed and with DTC P0742 set.


Important: This test is not applicable to the 4T80E transmission. Instead, replace the TCC PWM solenoid on vehicles with a 4T80E transmission using published procedures for the vehicle being serviced.

Perform one of the following diagnostics:
• Test drive the vehicle with the Tech 2® installed, Monitor TCC Release Pressure. The Status will be YES until TCC applies and then the display will read NO. If during acceleration the status remains NO and the upshifts are harsh and during deceleration the vehicle shudders during downshifts, suspect the TCC PWM solenoid.
• With the Tech 2 installed in the vehicle, start the engine. Build the vehicle on the Tech 2®. Apply and firmly hold the service brake. Place the transaxle in D4 and command Drive 3 with the Tech 2®. If the engine stumbles and/or stalls, suspect the TCC PWM solenoid.

Replace the TCC PWM solenoid using published procedures for the vehicle being serviced.

Hope this helps; and just keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment.

Have a nice day and thanks for using FixYa.

Oct 17, 2011 | 2005 Chevrolet Equinox

1 Answer

I have a 2001 caddy deville that i am buying there is a code that comes up P1860 can you tell me what that is Thank you Paul

Circuit Description with 4T80-E Automatic Transaxle
Ignition voltage is provided to the torque converter clutch pulse width modulated (TCC PWM) solenoid valve. The PCM controls the ON and OFF time of the solenoid by providing a ground through the output driver module (ODM) . The PCM uses a PWM duty cycle, in order to control application and release of the TCC. When the solenoid is commanded OFF, the PCM senses high volts. When the solenoid is commanded ON, the PCM senses low volts. If the PCM detects a continuous open, short to ground or short to voltage in the TCC PWM solenoid valve circuit, then DTC P1860 sets. DTC P1860 is a type B DTC.

Conditions for Running the DTC
  • The system voltage is 8-18 volts
  • The engine run time is greater than 5 seconds.
  • The TCC PWM solenoid valve duty cycle is 10% or less or 90% or greater.
Conditions for Setting the DTC
The TCC PWM solenoid valve feedback circuit indicates a continuous open, short to ground or short to voltage for 4.3 seconds.

Sep 23, 2010 | Cadillac DeVille Cars & Trucks

2 Answers

PO741 could it be the brake switch and how to know if its the problem 2004 freesatr

EOBD Code: P0741
Faiult location: Torque converter clutch (TCC) solenoid - performance or stuck off
Probable cause: Wiring, TCC solenoid

First time check the wires and connection plug & socket of TCC solenoid. If everything will be OK then replace TCC solenoid.

Sep 22, 2010 | Ford Freestar Cars & Trucks

2 Answers

I put a used transmission in my 2002 Isuzu Rodeo and code P1860 came on how can I fixed the problem if there is one


Jul 09, 2010 | Cars & Trucks

1 Answer

Code po741 on a cadillac deville dhs 2001

P0741 Torque Converter Clutch Circuit Performance or Stuck Off

Your car actually has a viscous converter clutch inside the torque converter instead of a (mechanical) torque converter clutch to lock up the torque converter for fuel economy improvement. You will see it referred to as the VCC and/or TCC.....

The TCC/VCC has a variety of components in the system including an electrical circuit supplying the transmission, the apply solenoid inside the trans, the torque converter itself, the PCM that controls the apply, etc. It is impossible to diagnose from afar. Unlikely that it is a "sensor" inside the trans as the PCM controls the VCC apply and uses engine and trans data that it receives from a variety of sources. If a "sensor" had failed the trouble code for that sensor would be setting......

Something as simple as the brake switch can cause the VCC to not apply correctly. There is a safety switch on the brake pedal that activates the brake lights and disconnects the VCC circuit. If it is misadjusted then the trans cannot apply the VCC. Lots of other trouble shooting items on the VCC system. If you don't have a service manual and cannot trouble shoot the system, I would recommend a Cadillac dealer as they have the trouble shooting information for the specific VCC that the Cadillac 4T80E trans has that a trans shop is simply not familiar with. No sense working on the trans until you actually know what is wrong.

Jan 13, 2010 | 2001 Cadillac DeVille

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