P0501-VEHICLE SPEED SENSOR PLAUSIBILITY

For a complete wiring diagram Refer to Section 8W


  • When Monitored:

    Engine temperature above 10.0°C. Battery voltage above 11.0 volts Transmission in drive gear. Brake Switch off (brakes not applied). Varying engine speed and load (indicating vehicle motion).

  • Set Condition:

    The vehicle speed message to the ECM indicates 0 mph when the ECM monitoring condition indicate that vehicle speed should be above 0 mph.


Possible Causes
  
INTERMITTENT CONDITION
  
CHECK FOR RELATED CONTROLLER ANTILOCK BRAKES DTCS
  
CHECK FOR RELATED TRANSMISSION CONTROL MODULE DTCS
  
ENGINE CONTROL MODULE
  



Diagnostic Test

1.CHECK FOR ACTIVE DTC

NOTE: If the ECM displays multiple CAN Bus related DTC's, check the CAN Bus circuits at the ECM harness connector for proper connection before continuing with this test.


NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the DTC is displayed.


NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.







Does the scan tool display this DTC?

Yes
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No

2.CHECK FOR RELATED CAB DTCS



NOTE: The ECM Receives vehicle speed messages via CAB Bus from the ABS module. An interruption on the CAN Bus can cause this fault to set.



Are any related CAB DTCs present?

Yes


No
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3.CHECK FOR RELATED TCM DTCS

NOTE: The TCM Receives vehicle speed messages via CAB Bus from the ABS module. An interruption on the CAN Bus can cause this fault to set.





Are any ABS CAN Bus Message or Vehicle Speed related TCM DTCs present?

Yes


No