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Section 154 (Automatic Transmission - 4L80-E/4L85-E - Service, Diagnosis & Troubleshooting)
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Third and Fourth Gear Only - D4
Third and Fourth Gear Only - D4
WARNING:
This page is about a different car, the 2007 GMC Yukon XL and 2007 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.
Third and Fourth Gear Only - D4
Checks
Cause
2-3 Solenoid (311)
Stuck On
Pinched wire to ground
2-3 Shift Valve (312)
Stuck
PCM
Failed
Check the PCM for current DTCs.