Network, generic

U014E Lost Communication With Multi-axis Acceleration Sensor Module B

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U014E concerns a second inertial sensor module, B. Such a unit combines accelerometers and gyroscopes, measures turning rate and acceleration across and along the car, and sends the values over the bus. A second module typically appears where functions need redundant or separately mounted motion data, for instance brake-by-wire, driver assistance or rollover detection alongside the stability system. No manufacturer documents U014E publicly. Module A (U0125) is well documented: GM's 2019 brake controller for the XT4 flags a missing inertial frame after only 0.1 s and rates it Type C without MIL. A gap from module B would hit the functions that depend on it, so stability control, adaptive cruise or lane assistance may shut down with a warning while normal braking stays available. U0123 and U0124 cover single-axis sensor modules.

Likely causes

Connector or wiring of sensor module B corroded or broken
Power or ground of module B missing
Sensor module B internally faulty
Receiving controller software not matching module B

Symptoms

  • Stability control or traction warning on
  • Driver assistance such as adaptive cruise unavailable
  • Normal braking unaffected

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

multi axis accel module bcan bus

Related codes

U0125U0123U0124

References: gsi.ext.gm.com, en.wikipedia.org, law.cornell.edu.