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Home >> Chevrolet >> 2005 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 4L80-E/4L85-E - Service, Diagnosis & Trouble Shooting >> Troubleshooting >> High Line Pressure

High Line Pressure

High Line Pressure

Checks Cause
Pressure Regulator Valve (231) Valve is stuck at high torque signal due to an undersized bore or sediment.
Reverse Boost Valve (228) Valve is stuck at high torque signal due to an undersized bore or sediment.
Retainer Pin (211) Pin is broken
Orificed Plug (210) Plug is blocked
Pressure Control Solenoid Valve (320)
  • Valve has failed Off
  • Loose connector
PCM Loose connector
Check the PCM for current DTCs.