Network, generic

U043C Invalid Data Received From Front Distance Range Sensor - Right

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U043C is the right-hand counterpart: invalid frames from the right front distance sensor, a corner radar on cars that pair one long-range radar with two short-range units. Finding only U043C points at that sensor, its plug or its mounting area, for example after a light knock on the right bumper corner; U043B and U043C together suggest a shared supply, bus segment or a software issue in the receiver. There is no public manufacturer documentation of U043C and no known threshold. In GM's 2025 EOCM3 tables the right front short-range radar is checked only for message loss, under U023E: more than 0.2 s without frames ends adaptive cruise, special Type C. Functions relying on the right corner view are reduced, others may stay available. U023E is lost contact.

Likely causes

Right corner radar knocked out of alignment or damaged
Shared supply or bus segment fault when both corner codes appear
Moisture or corrosion in the right sensor connector

Symptoms

  • Assistance functions using the right front view switched off
  • Sensor blocked or check sensor message

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€60–900
Time0.4–2.5 h

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

Parts involved

front distance sensor right

Related codes

U023EU043BU0433

References: gsi.ext.gm.com, en.wikipedia.org.