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  • Overheating
  • Loss of lube oil
  • TCC apply & release concerns
  • TCC codes


Continuous oscillation of the TCC regulator valve causes valve body bore wear, resulting in converter-related complaints and an overheated transmission.


The Sonnax TCC regulator valve kit contains a drop-in sleeve and valve assembly that restores hydraulic sealing with wear-resistant materials and greatly increased sealing contact areas.

A4CF1, A4CF2

TCC Regulator Valve Kit
Part No. 84741-07K

You need this if... View Instructions

Hyundai and Kia vehicles with A4CF1, A4CF2 transmissions may exhibit converter related complaints and transmission overheat. This may be caused by severe wear at the TCC regulator valve, allowing valuable converter regulator pressure to exhaust and significantly reducing lubrication oil. The drop-in Sonnax TCC regulator valve kit 84741-07K restores the critical hydraulic clearance between the valve and bore, and blocks the casting wear from exhausting critical pressure. The valve and sleeve are made from highly wear-resistant material, provide nearly double the sealing engagement over OE and have features to aid in valve centering.

  • The sleeve and valve assembly eliminates wear to allow proper stroking of the valve, has lengthened bore engagement for greater sealing integrity, and is made from wear-resistant materials for durability
  • A new spring is included to restore OE pressure specifications and work with the lengthened pressure regulator valve
  • Sleeve
  • Valve
  • Spring

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.

Hyundai/Kia A4CF1, A4CF2 Valve Body Layout

Hyundkia a4cf1 vbl
  • 84741 07k combo
  • 84741 07k

You need this if...

A vacuum test at the port indicated fails to hold at least 18 in-Hg.

  • 84741 07k test