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What does p1860 mean - 2002 Chevrolet TrailBlazer

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Transmission......Torque converter clutch pulse width modulator solenoid circuit.

Is it shifting terrible? If it is.......Could be a couple of things, bad ignition switch and or bad fuse box under the rear seat, could be shorting out, not getting enough current to the solenoid circuit.

Posted on Apr 06, 2011

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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

Cooling fan wont come on

Google the Codes
OBD P1258
OBD P1860
Include your vehicle
Dealer Codes?
What does that mean?
I wouldn't be at a dealer & codes
pertain to the vehicles strategy

Jul 22, 2013 | Cars & Trucks

1 Answer

2000 Grand Prix GT with a code of P1860. What is this code and how do I fix it?

P1860 refers to Torque converter clutch problem, what I mean is that when you go to O/D over drive the torque converter does not lock. You may have to take the vehicle into a ****** shop and they will change the modulator. Good luck and let me posted.

Sep 27, 2011 | 2000 Pontiac Grand Prix

1 Answer

1999 gmc sonoma 4.3 code p1860


TCC PWM Solenoid Circuit Electrical

Jan 30, 2011 | GMC Sonoma Cars & Trucks

1 Answer

My car has a code p1860

P1860: is a transmission code and its related to the Torque Converter, And might be the Clutch solenoid or something else internal. did you observe and weird thing happening with the Tranny during driving ? Good luck

Jan 16, 2011 | 2001 Cadillac DeVille

1 Answer

1998 buick lesabre custome obdII test type code is p1860 what is this?

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

Mar 25, 2010 | 1998 Buick LeSabre

1 Answer


P1860 and PO741 are both transmission codes.The 1860 is a "Long shift and Max adapt".What this means is,it is a slip code.The vehicle computer monitors all the time how long each shift takes to complete,in 1/10ths of seconds.If the shifts take too long to complete,the computer sees this and sets this code.When the code sets,the computer raises main line pressure inside the trans to compensate,and then the trans shifts hard or engages harder.The 0741 is also trans,it is a torque convertor lockup code.Either way,your trans is going to need a rebuild to solve these issues.Good luck.

Jul 19, 2008 | 2001 Oldsmobile Aurora

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