Symptoms:

  • Engine surge at idle
  • Low cooler flow
  • Low TCC release pressure

Cause:

Low converter release pressure at idle.

Correction:

The Sonnax drop-in pressure regulator valve allows regulated flow to the converter charge/lube circuit at vehicle idle, while preventing converter or pump drainback.

4L80-E, 4L85-E

Lube Regulated Pressure Regulator Valve
Part No. 34200-14K

You need this if... View Instructions Find a Distributor

The OE pressure regulator valve design prevents adequate cooler flow at low RPM and high pressure/demand conditions, which can create overheating. Additionally, in '99-later vehicles, the factory EPC pressure was set high at idle, resulting in engine surge conditions in GM 4L80-E and 4L85-E units. Sonnax lube regulated pressure regulator valve 34200-14K provides a significant increase in cooler flow under low RPM and high-pressure conditions that benefits all vehicles, and eliminates the need for reprogramming '99-later vehicles with high EPC pressure at idle. The replacement pressure regulator valve has an encapsulated check valve that allows regulated flow to the converter charge/lube circuit at vehicle idle.

  • Check valve prevents converter or pump drainback
  • Improves converter release pressure
  • Prevents engine surge at idle in '99-later vehicles
  • Drop-in Zip Valve parts install quickly and easily

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.

GM 4L80-E, 4L85-E, 400 Valve Body Layout

GM 4L80-E, 4L85-E, 400 Valve Body Layout

  • 4L80-E, 4L85-E Lube Regulated Pressure Regulator Valve 34200-14K
  • 4L80-E, 4L85-E Lube Regulated Pressure Regulator Valve 34200-14K

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.

4L80-E, 4L85-E Lube Regulated Pressure Regulator Valve Vacuum Test Locations