Network, generic

U0124 Lost Communication With Lateral Acceleration Sensor Module

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

With U0124 a controller reports that the frames from the lateral acceleration sensor module have stopped. This sensor tells the stability system how strongly the vehicle is being pushed sideways in a bend; together with yaw rate and steering angle it lets ESC detect skidding. In many cars the lateral and yaw sensing sit in one package, so U0123 and U0124 tend to appear as a pair and point to a shared supply or connector fault. Public manufacturer documents for U0124 itself are missing; the description rests on the J2012 title, CARB's network monitoring rules and GM's note that one inertial module carries all these signals (PIT5187A). Bad lateral data is coded U0536. ESC and traction aid go offline, braking stays normal.

Likely causes

Corroded or loose plug at the acceleration sensor module
Power or ground of the sensor module interrupted
Chafed bus wires on the way to the sensor
Sensor module internally faulty

Symptoms

  • ESC/traction warning lamp lit
  • Stability control deactivated
  • Frequently logged together with U0123

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

lateral acceleration sensorcan bus wiring

Related codes

U0536U0123U0125U0122

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