Diagnostic Aids
WARNING: This page is about a different car, the 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
If TCM DTC P0722 is also set, diagnose that DTC first. See appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS. If an output speed sensor signal circuit fault is occurring, a vehicle speed of 0 MPH will be sent to the ECM and the ECM will set DTC P0500.
To locate an intermittent problem, use scan tool to monitor VEHICLE SPEED in ECM data table with vehicle raised and drive wheels moving greater than 3 MPH. If an intermittent output speed sensor signal is occurring, VEHICLE SPEED on scan tool will go to 0 MPH. Use DIAGNOSTIC AIDS under DTC P0722 OUTPUT SPEED SENSOR CIRCUIT LOW VOLTAGE in appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS to help locate the intermittent problem.