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Section 718 (Automatic Transmission - 4L80-E/4L85-E - Service, Diagnosis & Troubleshooting)
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First and Fourth Gear Only - D4
First and Fourth Gear Only - D4
WARNING:
This page is about a different car, the 2006 GMC Sierra and 2006 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
First and Fourth Gear Only - D4
Checks
Cause
1-2 Solenoid (313)
Stuck On
Pinched wire to ground
1-2 Shift Valve (314)
Stuck
PCM
Failed
Check the PCM for current DTCs.