Tool Required VB-FIX Required
- Code P0741, P0742
- Failsafe mode
- Harsh shifts
- Harsh TCC apply
- High TCC slip RPM
- Loss of fuel economy
- Overheated fluid
Bore wear at the TCC regulator valve reduces TCC apply and converter charge pressure. A stuck TCC regulator valve causes either TCC slip or harsh apply.
Ream to restore the bore and install Sonnax oversized valve kit to restore proper valve function.
Oversized TCC Regulator Valve Kit
- TCC Regulator Valve
- Shuttle Valve
- End Plug
Vehicles with GM 6L45, 6L50, 6L80, 6L90 series transmissions may have a number of TCC apply problems. Bore wear at the TCC regulator valve can cause no TCC apply or slipping on engagement, harsh shifts, loss of performance and fuel economy, and fluid overheat. If the valve is stuck in the apply position, the result is harsh TCC apply. If the valve is stuck in the release position, no TCC apply or TCC slip will result. Installing Sonnax oversized TCC regulator valve kit 104740-07K will restore proper valve function, resulting in proper TCC apply.
- Valve is hardcoat anodized to reduce wear
- Restores proper valve function and TCC apply
You need this if...
Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.
Click here to view PDF if instructions do not appear below.
Valve Body Layouts
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