Listed GM 6-speed transmissions often set various trouble codes related to failures of fluid pressure switches that are internal to the transmission electro-hydraulic control module (TEHCM). These codes may be accompanied by TCC apply problems or shift irregularities such as slipping, flares, harsh application, and bind-ups. As time goes by, the laminated portions of the pressure switches can breach, preventing normal switch operation. If more than one switch breaks down, failsafe mode can be triggered. Since switches cannot be obtained through OE channels, replacement of the TEHCM was the only previous remedy available.
It is no longer necessary to replace the expensive TEHCM assembly to rectify this concern. Installing Sonnax pressure switch rebuild master pack 124740-28K restores normal switch operation, eliminating codes and providing renewed shift performance in all ranges.
All I need to say is WOW! Since getting the new tools and kit, I have done 4 transmissions and all went great. I want to say thank you to Sonnax for creating a kit that makes working on these transmissions a little easier.Rino
Before installing kit, test switches to verify proper electrical operation. Kit repairs laminate disc and seal failures only; it will not rectify electrical breakdown. See instructions for details.
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.
October 27, 2014
Topics: Transmission GM 6T45 (Gen.1) Transmission 6L90 Transmission 6L80 Transmission 6L50 Transmission 6L45 Transmission 6T50 (Gen. 1) Transmission 6T70 (Gen. 1) Transmission 6T75 (Gen. 1) Transmission 6T40 (Gen. 1) TransmissionRead Now
February 19, 2015
Topics: Vacuum Testing Transmission Report Newsletters Diagnostics And Theory TransmissionRead Now
October 28, 2014
Topics: Rebuilding Tips Transmission GM 6L90 Transmission 6L80 Transmission 6L50 Transmission 6L45 Transmission 6T70 (Gen. 1) Transmission 6T75 (Gen. 1) TransmissionWatch Now
September 30, 2005
Topics: Diagnostics And Theory TransmissionRead Now
Contact a Sonnax Parts Distributor.