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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1004 (Automatic Transmission - 4L80-E/4L85-E (Troubleshooting)) >> Troubleshooting >> Soft Shifts

Soft Shifts

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Soft Shifts

Checks Cause
Line Pressure Too low
Pressure Control Solenoid Valve (320)
  • Stuck On
  • A broken clip is causing leakage.
  • Pinched wire to ground
PCM Failed
Accumulator Piston
  • Leaking
  • Stuck
Accumulator Spring Incorrect
Calibration PROM Incorrect
Check the PCM for current DTCs.
Shift Solenoids Leaking
4th Accumulator Piston Pin Retainer Ring Missing
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