First Gear Only - D4 for GMC Truck Yukon XL - 2WD 2004

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.

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.