Transmission Torque Converter Clutch Solenoid

Faulty Transmission Torque Converter Clutch Solenoid: SYMPTOMS – Failed in the Open Position

The symptoms are different a torque converter clutch solenoid that fails in the open position… The symptoms of a torque converter clutch solenoid that fails while in the open position are quite different from a solenoid that fails in the closed position, as described above. When the solenoid is open, the engine is locked to the transmission so there is no transmission slip. With the transmission unable to slip, the engine will stall when the vehicle comes to a stop.

This type of solenoid failure will set a Diagnostic Trouble Code causing the Check Engine Light to illuminate. The same Diagnostic Trouble Codes listed above apply.

Torque Converter Clutch Solenoid: REPLACEMENT COST

The cost to replace a failed transmission torque converter clutch solenoid is determined, in part, by the vehicle year, make and model. Other factors, such as where the work is done (whether at a local auto repair shop, car dealership or you do-it-yourself) also factors heavily into the cost of repair. If you choose to replace the solenoid yourself, the parts supplier you purchase the solenoid from will factor into your total repair.

Below are costs for replacing the transmission torque converter clutch solenoid in four different vehicles. You can use these costs as a guide in estimating your cost.

DIY costs assume transmission fluid is reused. Replacing the fluid with new ATF increases the cost.  ATF costs between $5 and $10 per quart. You will need between 3 and 5 quarts.

Fail Safe (or Limp Mode)

A failed transmission solenoid or an open circuit anywhere in the electrical system may cause the transmission to go into Fail Safe (or “limp” mode as it is also called) in order to protect the transmission from internal damage that might be caused by the faulty solenoid or open circuit.  In fail safe/limp mode, the transmission will have limited functionality and will lock in either 2nd. or 3rd. gear.  When the transmission is in fail safe mode, the vehicle should only be drive home or to the repair shop.  Maximum speed while in limp mode is around 30 mph.

Continuing to drive the vehicle with the transmission in fail safe or driving faster than the recommended fail safe speed will cause the transmission to overheat.  Excessive heat build up in an automatic transmission is the #1 cause of catastrophic failure.  So, avoid extended driving when the transmission is in fail safe mode.