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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1004 (Automatic Transmission - 4L80-E/4L85-E (Troubleshooting)) >> Troubleshooting >> First Gear Only - D4

First Gear Only - D4

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
First Gear Only - D4

Checks Cause
Sun Gear Shaft (649) Broken shaft or broken splines
AT Output Speed Sensor Assembly (22) Reads zero
Check for DTCs.
AT Input Speed Sensor Assembly (22) Reads zero
Check for DTCs.
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