Delayed Shift 1 to 2

WARNING: This page is about a different car, the 2006 GMC Yukon XL, 2006 Chevrolet Suburban, and 2006 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

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 PCM Loose bolts causing leakage
Calibration PROM	Incorrect
Check the PCM for current DTCs.