GM Service Manual Online
For 1990-2009 cars only
Makes
🢒
GMC_Truck
🢒
2006
🢒
Yukon XL Denali
🢒
Transmission/Transaxle
🢒
Automatic Transmission - 4L80-E/4L85-E
🢒 Fourth Gear Starts
Checks
Cause
2-3 Shift Solenoid Valve
•
Stuck On
•
Pinched wire to ground
Check the PCM for current DTCs.