DTC P0500: Vehicle Speed Sensor (VSS) Circuit Malfunction

NOTE: DTC P0500 will set on vehicles equipped with A/T.

Test-drive vehicle. Using scan tool, check vehicle speed. If correct speed is not indicated, go to next step. If correct speed is indicated, problem is intermittent, system is okay at this time. Check for poor connections or loose wires between VSS and PCM connectors. See the WIRING DIAGRAMS article.
Turn ignition off. Block rear wheels and set parking brake. Raise and support front of vehicle. Turn ignition on. Block right front wheel and slowly rotate left front wheel. Measure voltage between PCM 32-pin connector terminal No. 9 (Brown/Black wire) and PCM 31-pin connector terminal No. 18 (Blue/White wire). See Figure. If voltage does not toggle between zero and 5 volts, go to next step. If voltage toggles between zero and 5 volts, substitute a known-good PCM and recheck. If DTC does not reset, replace original PCM.
Turn ignition off. Disconnect PCM 31-pin connector. Turn ignition on. Block right front wheel and slowly rotate left front wheel. Measure voltage between PCM 32-pin connector terminal No. 9 (Brown/Black wire) and PCM 31-pin connector terminal No. 18 (Blue/White wire). If voltage toggles between zero and 5 volts, substitute a known-good PCM and recheck. If DTC does not reset, replace original PCM. If voltage does not pulse between zero and 5 volts, repair an open or short in wire (Blue/White wire) between PCM and cruise control unit or VSS. See the WIRING DIAGRAMS article. If wire is okay, check VSS. See the SYSTEM/COMPONENT TESTS article.