A worn torque signal valve/bore and/or a sticking torque signal valve.
The Sonnax valve and tool allow you to salvage the valve body by oversizing the bore and restoring proper hydraulic clearances.
P1811 code or a slip/shudder condition can indicate a pressure control problem in the 4T65-E. A worn or sticking torque signal regulator valve and bore reduces or prevents line rise, resulting in long soft shifts and slippage. The Sonnax 84754-TL44 tool kit sizes and finishes the bore to accept the oversized valve 84754-44, restoring proper function to the torque signal oil circuit.
To eliminate codes 1811 and 741and TCC-related issues, be sure to also inspect the actuator feed limit valve, boost valve assembly, TCC regulated apply valve and TCC apply valve. The PCM must be reset/relearned after any valve body repairs. Aftermarket scanner relearn procedure or battery disconnect for 12 hours may not restore drivability and line pressure control. Performing a dealer reflash or a web reflash is frequently the only method to properly restore control.
Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.
March 21, 2013
Topics: Vacuum Testing Vacuum Test Guides Transmission GM 4T65-E TransmissionRead Now
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