First Gear Only - D4. GMC Truck GMC P42 Commercial Chassis 1999

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC P42 Commercial Chassis 🢒 Transmission/Transaxle 🢒 Automatic Transmission - 4L80-E 🢒 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.

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.