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  • Low line pressure
  • Shift concerns
  • Delayed Forward
  • No lockup


Continuous oscillation of the pressure reducing valve causes valve body bore wear, resulting in diminished solenoid feed pressure and a multitude of drivability complaints.


The Sonnax pressure reducing valve kit contains a highly wear-resistant sleeve and valve assembly that restores hydraulic sealing and prevent critical solenoid feed oil loss.

A4CF1, A4CF2

Pressure Reducing Valve Kit
Part No. 84741-10K

You need this if... View Instructions

Hyundai and Kia vehicles with an A4CF1, A4CF2 transmission may exhibit a multitude of drivability complaints that can be caused by severe wear at the pressure reducing valve, allowing critical solenoid feed pressure to exhaust. The Sonnax pressure reducing valve kit 84741-10K restores the proper hydraulic clearance between the valve and bore, and prevents future wear.

  • Parts are made from highly wear-resistant materials
  • Kit restores hydraulic clearance
  • Spring restores OE pressures
  • Sleeve
  • Valve
  • Spring
  • Retaining Clip

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 10k combo
  • 84741 10k

You need this if...

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

  • 84741 10k test