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GMC
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2004
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Envoy RWD
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Repair and Diagnosis
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Transmission
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Automatic Trans
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Automatic Transmission, 4L60-E/4L65-E (Troubleshooting)
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Diagnostic Information and Procedures
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Second/Third Gear Only or First/Fourth Gears Only
Second/Third Gear Only or First/Fourth Gears Only
Second/Third Gears Only or First/Fourth Gears Only
Checks
Causes
1-2 Shift Solenoid Valve (367A)
Sediment is in the valves
The electrical connection is faulty
Damaged seal