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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 237 (Automatic Transmission - 4L80-E/4L85-E (Service & Replacement)) >> Diagnostic Information and Procedures >> First Gear Only - D4

First Gear Only - D4

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First Gear Only - D4

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