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Home >> Chevrolet >> 2005 >> Chevy Express H1500, Van Passenger >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Automatic Transmission - 4L80-E/4L85-E - Service, Diagnosis & Trouble Shooting) >> Troubleshooting >> Soft Shifts

Soft Shifts

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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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