GM Service Manual Online
For 1990-2009 cars only

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.