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  • No Drive when hot
  • Default mode
  • Pressure regulation codes
  • Pressure sensor reading low


Pressure regulator and plunger valves and bores show significant wear.


Sonnax has designed an oversized valve that restores OE normal line pressure and shift concerns.


Oversized Pressure Regulator Valve Repair Kit
Part No. 120940-01K

You need this if... View Instructions

Excessive OE plunger valve and bore wear results in high line pressure conditions. Excessive wear of the OE pressure regulator valve and bore may cause low, high or unstable line pressure issues. When installed, the Sonnax pressure regulator valve repair kit, 120940-01K, restores correct pressure regulator and plunger valve operation to provide appropriate line pressure for all operating conditions.

  • Salvages otherwise scrap DPO/AL4 valve bodies for reuse.
  • Restores nominal OE line pressure and eliminates related shift problems.
  • Hard anodized aluminum valves resist wear
  • Pressure Regulator Valve
  • Plunger Valve
  • Pressure Regulator Spring
  • 120940 01k combo
  • 120940 01k

You need this if...

Vacuum tests at the ports indicated (A, B, C & D) do not hold 18" or if a Wet Air Test at the same locations result in leaking at the corresponding ports.

  • 120940 01k plateside