Network, generic

U0250 Lost Communication With Impact Classification System Module

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Within the airbag system, an impact classification module sorts a collision by type and force, so that airbags and belt pretensioners fire in the right combination and stage. U0250 is logged when its messages no longer reach the network, most plausibly by the restraint control module. No manufacturer publishes a description, timeout or fault type for this code. Patent US7832762 on crash sensing over a vehicle bus explains why such a link is monitored at all: sensors and the occupant protection controller exchange their data as messages, so a missing node removes input from the deployment decision. Expect the airbag warning lamp to light and the restraint system to run without that information until the fault is gone. Work on it belongs in a workshop. Restraint module loss is U0151; invalid data from this unit are U0551.

Likely causes

Loose or corroded connector or damaged harness to the module, often after body repair
Module without power or ground
Module damaged in a collision or not set up after replacement
Module internally faulty

Symptoms

  • Airbag warning lamp on
  • Code also stored in the restraint control module

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–1,200
Time0.5–3 h

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

Parts involved

impact classification modulevehicle bus wiring

Related codes

U0551U0151

References: patents.google.com, en.wikipedia.org.