U0250 code meaning
Lost Communication With Impact Classification System Module
What U0250 means
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.
U0250 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0250
- Airbag warning lamp on
- Code also stored in the restraint control module
Common causes of U0250
- Most likelyLoose or corroded connector or damaged harness to the module, often after body repair
- PossibleModule without power or ground
- PossibleModule damaged in a collision or not set up after replacement
- Less likelyModule internally faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Impact classification moduleVehicle bus wiring
What each part of U0250 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 50 | The exact fault in that area. |
What to do next
- Note U0250 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U0250
What does U0250 mean?
U0250 means "Lost Communication With Impact Classification System Module". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with U0250?
U0250 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0250 fail an emissions test?
U0250 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U0250 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U0250 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.