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john aka eaut
john aka eaut, The Car Guy
Category: Pontiac
Satisfied Customers: 16018
Experience:  15 years as a auto tech
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I have a 2008 Pontiac Gran Prix that had a code PO741 torque

Customer Question

I have a 2008 Pontiac Gran Prix that had a code PO741 torque convertor performance. What is the resolution for this problem?
Submitted: 1 year ago.
Category: Pontiac
Expert:  john aka eaut replied 1 year ago.

generally replacing the tcc solenoid is the cure, The transmission control module (TCM) controls the torque converter clutch pulse width modulation (TCC PWM) solenoid valve. The solenoid controls the hydraulic fluid for TCC apply and release. When the TCC is fully applied, the engine is coupled directly to the transmission through the TCC. The TCC used is an electronically controlled capacity clutch (ECCC). The TCM normally allows a small amount of slip to occur with the ECCC. When the TCC is engaged, TCC slip speed is maintained at approximately 20-50 RPM. The 1-2 shift solenoid (SS) valve and the 2-3 SS valve are supplied with fused ignition voltage. The ground path is controlled by the TCM. When the TCM commands the solenoid OFF, a ground path is not provided and the filtered line pressure that is fed to the solenoid is exhausted. When the TCM commands the solenoid ON, a ground path is provided and the exhaust port is blocked, stopping the exhaust of line pressure. The TCM identifies a 1-2 SS valve or a 2-3 SS valve condition by monitoring the commanded gear versus gear ratio. Refer to Shift Solenoid Valve State and Gear Ratio

Expert:  john aka eaut replied 1 year ago.
  1. Remove the case side cover. Refer to Control Valve Body Cover Replacement .
  2. Disconnect the torque converter clutch (TCC) solenoid electrical connector.
  3. Remove the TCC solenoid retaining clip (314)
  4. Remove the TCC solenoid (315).

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