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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 154 (Automatic Transmission - 4L80-E/4L85-E - Service, Diagnosis & Troubleshooting) >> Low Line Pressure

Low Line Pressure

WARNING: This page is about a different car, the 2007 GMC Yukon XL and 2007 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.
Low Line Pressure

Checks Cause
Pump (203) Cross channel leak at body to cover, or cross channel leak at body to case gasket
Pressure Regulator Valve (231) Valve is stuck at a low torque signal due to an undersized bore or to sediment.
Reverse Boost Valve (228) Valve is stuck at a low torque signal due to an undersized bore or to sediment.
Pump Valve Bores Excessive valve clearance due to wear.
Spring (230) The spring is broken.
Retainer Pin (211) The pin is broken.
Valve Body (301)
  • Cross channel leaks
  • Cross valve land leaks
Gasket/Spacer Plate The plate is damaged or missing.
Pressure Control Solenoid Valve (320)
  • The valve is stuck On.
  • A broken clip causes leakage.
  • A wire is pinched to ground.
  • A screen is missing.
PCM Failed
Check the PCM for current DTCs.
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