GM Service Manual Online
For 1990-2009 cars only

Checks

Cause

AT Output Shaft Speed Sensor Assembly (22)

    â€¢ A pinched or broken wire
    â€¢ A loose connector
    â€¢ An incorrect air gap
    â€¢ An inadequate signal
    â€¢ Coil damage

AT Input Shaft Speed Sensor Assembly (22)

    â€¢ A pinched or damaged wire
    â€¢ Coil damage
    â€¢ An inadequate signal

AT Fluid Pressure Manual Valve Position Switch Assembly (40)

    â€¢ A loose connector
    â€¢ A pinched wire
    â€¢ No signal to the PCM
    â€¢ Loose bolts causing leakage

Calibration PROM

Incorrect

Check the PCM for current DTCs.

Only 2WD