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Home >> Ford >> 2003 >> Cutaway 7.3 F >> Repair and Diagnosis >> External Pages >> Different car >> Section 2050 (Engine Controls - Diagnostic Subroutines - 6.4L 99R Diesel -- F250-F550 Super Duty) >> Diagnostic Trouble Code (DTC) Charts and Descriptions >> P0503 - Vehicle Speed Sensor (VSS) A Intermittent/Erratic/High

P0503 - Vehicle Speed Sensor (VSS) A Intermittent/Erratic/High

WARNING: This page is about a different car, the 2008 Ford Pickup, 2008 Ford F550 Super Duty, 2008 Ford F450 Super Duty, and 2008 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
P0503 - VEHICLE SPEED SENSOR (VSS) A INTERMITTENT/ERRATIC/HIGH

Description:  Indicates poor or noisy VSS performance. Vehicle speed data is received from either the VSS, or the anti-lock brake system (ABS) control module over the controller area network (CAN).
Possible Causes: 
  • Noisy VSS input signal from the radio frequency interference / electromagnetic interference (RFI/EMI) external sources, such as ignition components or the charging circuit
  • Damaged VSS
  • Damaged wiring harness or connectors
  • Malfunction in the module(s) or circuit connected to the VSS circuit
  • Aftermarket add-on
Diagnostic Aids:  Monitor the VSS PID while driving the vehicle, and check for intermittent vehicle speed indication. Verify the ignition and charging systems are functioning correctly.
Application    Key On Engine Off  Key On Engine Running  Continuous Memory 
All   refer to PINPOINT TEST DF .
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