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ElectricalSeverity High: diagnose before driving on

U0151Lost Communication With Restraints Control Module

What it means

A control module stopped receiving messages from the airbag (restraints) control module on the data bus (CAN). The airbag (restraints) control module may be without power or ground, or the bus wiring to it is faulty.

Symptoms

  • Airbag warning light on
  • Several warning lights at once
  • Other modules may store related codes

Common causes

  • No power or ground at the airbag (restraints) control module
  • CAN wiring open, shorted or corroded (CAN-H / CAN-L)
  • Low battery voltage during cranking
  • Failed airbag (restraints) control module

What to check first

  1. Check fuses, supplies and grounds at the airbag (restraints) control module
  2. Measure CAN-H to CAN-L resistance with the battery disconnected (about 60 Ω on most cars)
  3. Scope CAN-H and CAN-L for a clean mirrored signal
Can I drive with U0151? Not recommended. U0151 can lead to stalling, limp mode or engine damage; diagnose it before driving further.

Generic OBD-II meaning. Manufacturer-specific meanings and checks can differ; always check the service information for the car.

How to test the parts behind U0151

CAN bus networkWiring, typical values, multimeter and scope tests

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U0151: questions and answers

What does U0151 mean?

U0151: Lost Communication With Restraints Control Module. A control module stopped receiving messages from the airbag (restraints) control module on the data bus (CAN). The airbag (restraints) control module may be without power or ground, or the bus wiring to it is faulty.

What are the symptoms of U0151?

Airbag warning light on. Several warning lights at once. Other modules may store related codes.

What causes U0151?

No power or ground at the airbag (restraints) control module. CAN wiring open, shorted or corroded (CAN-H / CAN-L). Low battery voltage during cranking. Failed airbag (restraints) control module.

How do you diagnose U0151?

1. Check fuses, supplies and grounds at the airbag (restraints) control module 2. Measure CAN-H to CAN-L resistance with the battery disconnected (about 60 Ω on most cars) 3. Scope CAN-H and CAN-L for a clean mirrored signal

Can I drive with U0151?

Not recommended. U0151 can lead to stalling, limp mode or engine damage; diagnose it before driving further.