P0500

The ECM receives vehicle speed over the controller area network (CAN) from the transmission control module (TCM) based on the output speed sensor. The output speed sensor is attached to the top rear of the transaxle case. The sensor uses a hall effect switching device to transition from a low voltage to a high voltage as each of the eighteen teeth on the output shaft is passed. The ECM will continuously monitor the vehicle speed sent over the CAN link to verify the message is above a certain speed. DTC P0500 will set if the ECM does not detect a sufficient amount of vehicle speed from the TCM over the CAN link when engine speed is above a certain range with the transmission in fourth or fifth gear.

DTC PARAMETERS
DTC P0500 will set if the ECM detects vehicle speed less than 5 km/hr (3 mph) when:
^ Condition exists for longer than 3 seconds
^ Transaxle is in 4th or 5th gear

OR

^ Vehicle is in a decel
^ Engine speed is between 1800 and 3000 rpm
^ ECT is greater than 64°C (147°F)
^ No CAN link DTCs have been set in the ECM

DTC P0500 diagnostic runs continuously once the above conditions have been met.

P0500 is a type B DTC.

DIAGNOSTIC AIDS

IMPORTANT: If TCM DTC P0722 is also set, diagnose that DTC first. 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 5 km/h (3 mph). If an intermittent output speed sensor signal is occurring, VEHICLE SPEED on Scan tool will go to 0 mph. Use TCM DTC P0722 Diagnostic Aids to help locate the intermittent problem.