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2006
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Sierra 1500 HD, 4WD
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Repair and Diagnosis
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Different variant/trim
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Section 15 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - Service, Diagnosis & Troubleshooting)
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Third Gear Only
Third Gear Only
WARNING:
This page is about a different variant/trim than selected.
Third Gear Only
Checks
Causes
System Voltage
12 volts not supplied to transmission
Electrical short (pinched solenoid wire)
Solenoid not grounded