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2005
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Silverado 1500 HD, 4WD
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Repair and Diagnosis
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Transmission
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Automatic Trans
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Automatic Transmission - 4L80-E/4L85-E - Service, Diagnosis & Trouble Shooting
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Troubleshooting
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Fourth Gear Starts
Fourth Gear Starts
Fourth Gear Starts
Checks
Cause
2-3 Shift Solenoid Valve
Stuck On
Pinched wire to ground
Check the PCM for current DTCs.