Network, generic

U0123 Lost Communication With Yaw Rate Sensor Module

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U0123 is stored when the stability controller or another listener misses the messages of a networked yaw rate sensor, the unit that measures how fast the car rotates around its vertical axis. Without that signal ESC cannot compare the actual turn with the steering input. No manufacturer explains U0123 in an openly accessible document; Ford merely lists it among the OBD codes of the 2014 Boss 302S. GM bulletin PIT5187A shows how such sensors are packaged today: yaw rate, inertia and multi-axis sensor are names for one combined module, which is why newer GM cars report it under U0125. Lateral acceleration has its own code U0124, invalid yaw data is U0513. Expect ESC and traction lamps on; driving remains possible.

Likely causes

Loose or corroded connector at the yaw rate sensor (often under the centre console or seat)
Fuse, supply or ground of the sensor module missing
Damaged chassis CAN wiring to the sensor
Yaw rate sensor module internally failed

Symptoms

  • ESC and traction control warning lamps on
  • Stability control switched off for the rest of the trip
  • Often stored together with U0124 when both signals come from one housing

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–900
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

yaw rate sensorcan bus wiring

Related codes

U0513U0124U0125C0063U0122

References: law.cornell.edu, performanceparts.ford.com, static.nhtsa.gov, en.wikipedia.org.