GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC K Pickup - 4WD 🢒 Transmission/Transaxle 🢒 Automatic Transmission - 4L80-E 🢒 First and Second Gear Only - D4

First and Second Gear Only

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

PCM Quad Driver Module

Failed

Check the VCM/PCM for current DTCs