GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2006 🢒 Chevrolet W-Series Commercial W4 (W3500/W4500) 🢒 Transmission/Transaxle 🢒 Automatic Transmission - 4L80-E/4L85-E 🢒 First and Second Gear Only - D4

First and Second Gear Only - D4 for Chevrolet Chevrolet W-Series Commercial W4 (W3500/W4500) 2006

Checks

Cause

2-3 Solenoid (311)

Check for DTCs.
    • Stuck Off
    • Loose connector
    • No voltage to the solenoid
    • Solenoid O-ring failure
    • No PCM signal to the solenoid

2-3 Shift Valve (312)

Stuck

Check the PCM for current DTCs.