DDEC III/IV Single ECM Troubleshooting – Section 54.1 Description of Flash Code 54

Section 54.1
Description of Flash Code 54

Flash Code 54 indicates that during engine operation the vehicle speed that is measured by the Vehicle Speed Sensor (VSS) is less than the expected value for the current engine speed/conditions.‪

This diagnostic condition is typically:‪

• Open sensor signal circuit
• Conditions
  • Code is logged (without anti-tamper) when the rpm >1500 and PW >15° and vehicle speed < 3 mph.
  • If code is logged (with or without anti-tamper) mph will be limited.

Note: Code will not be logged for the first five hours of ECMs life (total engine hours).