C1234 – Right Front Wheel Speed Sensor Input Signal Missing

Meaning:

When the PCM or vehicle speed sensor (VSS) has failed to receive signals from the Right Front Wheel Speed Sensor, the C1234 happens
The C1234 is triggered when the PCM or vehicle speed sensor (VSS) has failed to receive signals from the Right Front Wheel Speed Sensor

PCM or vehicle speed sensor (VSS) has failed to receive signals from the Right Front Wheel Speed Sensor.

Main Symptoms:

Possible Causes:

  • Poor connection in Right Front Wheel Speed Sensor
  • Open, shorted or broken wire in Right Front Wheel Speed Sensor harness
  • Defective Right Front Wheel Speed Sensor

Diagnostic Steps:

  • Visually inspect all wiring in the Right Front Wheel Speed Sensor circuit for loose, open or short connections
  • Perform resistance test on Right Front Wheel Speed Sensor. Replace if necessary
  • Reset code and do drive cycle, if it returns probe ABS system entirely

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