Tool Required VB-FIX Required

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Symptoms:
  • Erratic TCC apply pressure
  • Excess TCC slip
  • Harsh TCC apply & release
  • Low cooler & lube pressure
  • TCC codes
Cause:

Excess bore wear at the secondary pressure regulator valve allows critical pressure loss and/or valve hang-up.

Correction:

Recover hydraulic control and revive TCC/lube/cooler pressures by reconditioning the bore and installing Sonnax oversized secondary pressure regulator valve kit.

Tool Required VB-FIX Required

U341E, U341F

Oversized Secondary Pressure Regulator Valve Kit

Part No.

37740-07K

Oversized Secondary Pressure Regulator Valve Kit
  • 37740-07k_combo

  • Oversized Secondary Pressure Regulator Valve Kit

Small_37740-07k_combo Small_37740-07k

U341E, U341F

Oversized Secondary Pressure Regulator Valve Kit

Part No. 37740-07K

  • Valve
  • End Plug

Complaint:

  • Erratic TCC apply pressure
  • Excess TCC slip
  • Harsh TCC apply & release
  • Low cooler & lube pressure
  • TCC codes

Cause:

Excess bore wear at the secondary pressure regulator valve allows critical pressure loss and/or valve hang-up.


Correction:

Recover hydraulic control and revive TCC/lube/cooler pressures by reconditioning the bore and installing Sonnax oversized secondary pressure regulator valve kit.

Vehicles with Toyota/Lexus U341E and U341F transmissions commonly have TCC problems such as harsh apply and release or excess slip, often accompanied by TCC codes. These issues can be caused by bore wear at the secondary pressure regulator valve, which allows vital fluid to escape the circuit. In addition, cooler and lube pressures can be negatively affected, resulting in overheating and lube failures. Reconditioning the bore and installing Sonnax oversized secondary pressure regulator valve kit 37740-07K restores critical clearances for renewed TCC, cooler and lube operation.

  • Lengthened critical spool for added stability and wear prevention
  • Hardcoat anodized aluminum valve combats premature wear

Required Tools

Related Parts

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.

  • Test Locations

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Valve Body Layouts

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.

Valve Body Layout Toyota U341E/F
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