Delayed Shift 1 to 2. GMC Truck GMC K Pickup

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC K Pickup - 4WD 🢒 Transmission/Transaxle 🢒 Automatic Transmission - 4L80-E 🢒 Delayed Shift 1 to 2

Checks

Cause

AT Output (Shaft) Speed Sensor Assembly (22)

•	A pinched or broken wire

•	A loose connector

•	An incorrect air gap

•	An inadequate signal

•	Coil damage

AT Input (Shaft) Speed Sensor Assembly (22)

•	A pinched or damaged wire

•	Coil damage

•	An inadequate signal

AT Fluid Pressure Manual Valve Position Switch Assembly (40)

•	A loose connector

•	A pinched wire

•	No signal to the VCM/PCM

•	Loose bolts causing leakage

Calibration PROM

Incorrect

Check the VCM/PCM for current DTCs

Only 2WD

•	Malfunction

•	Loose connector