Inaccurate Shift Points

WARNING: This page is about a different car, the 2007 GMC Yukon XL and 2007 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.

Checks	Cause
AT Output Shaft Speed Sensor Assembly (22)	Pinched or broken wire Loose connector Incorrect air gap Inadequate signal Damaged coil Damaged rotor teeth Loose connection
Throttle Position Sensor	Pinched or damaged wire Incorrect resistance Loose connector PCM malfunction
AT Fluid Pressure Manual Valve Position Switch Assembly (40)	Loose connector Loose bolts causing leakage A pinched wire No signal to the PCM
Axle Ratio	Ratio is incorrect or ratio has been changed from its original value.
Tire Size	Tire size is incorrect or the size has been changed from its original value.
Check the PCM for current DTCs.