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U0154 – Lost Communication With Restraints Occupant Sensing Control Module (OBD2)

U0154 means "Lost Communication With Restraints Occupant Sensing Control Module". These codes are stored when a control unit stops receiving messages from the airbag control module, side restraint modules, occupant sensing or individual crash sensors and seat belt pretensioner modules.

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U0154 quick summary

Fault codeU0154
MeaningLost Communication With Restraints Occupant Sensing Control Module
SystemNetwork / CAN Bus
VehiclesGeneric OBD2
SeverityHigh
Can I drive?The car drives normally, but airbags may not work in a crash. Have it repaired as soon as possible.
Repair cost€0 – €800

What 'lost communication' codes with airbag modules and sensors mean

The airbag system consists of a control module, front and side crash sensors, occupant detection and seat belt pretensioners. They communicate with each other and with the rest of the car; if a module or sensor goes silent, a U015x or U017x code is stored and the airbag warning light comes on.

With an airbag fault, some or all airbags and pretensioners may not deploy in a crash. This is a safety issue and in most countries a reason to fail the technical inspection.

Common causes are corroded connectors (under seats and in doors), wiring damage after seat or door work, low voltage, and crash sensors damaged by minor impacts or water. Work on airbag systems must follow safety procedures.

Symptoms of U0154

  • Airbag warning light on
  • Passenger airbag status light wrong
  • Code stored in airbag and other modules
  • Seat belt warnings incorrect
  • No other driving symptoms

Most common causes of U0154 (most likely first)

Mechanic's Pro Tip

Never probe airbag igniter circuits with a normal ohmmeter and always disconnect the battery and wait the specified time before unplugging airbag components. Many airbag communication faults are just a seat connector that was not clicked fully home after cleaning the car.

  1. 1.Corroded or loose connector under a seat or in a door

    Most likely

  2. 2.Wiring damage after seat or door work

  3. 3.Crash sensor damaged by impact or water

  4. 4.Low battery voltage

  5. 5.Failed module or sensor

Step-by-step diagnostic guide

  1. 1

    Read airbag codes

    Read the airbag control module and note which sensor or module is not communicating.

  2. 2

    Check battery voltage

    Make sure battery voltage is normal.

  3. 3

    Inspect connectors safely

    With the battery disconnected and the waiting time observed, check connectors under seats and in doors.

  4. 4

    Check wiring

    Check wiring to the named sensor or module for damage (do not measure airbag igniters with a normal multimeter).

  5. 5

    Repair, code and clear

    Repair or replace the part, code it if needed, clear codes and check that the warning light goes out.

Frequently asked questions

Can I keep driving with U0154?

The car drives normally, but airbags may not work in a crash. Have it repaired as soon as possible.

How much does it cost to fix U0154?

Typical repair costs are 0 € – 800 €, depending on the cause and the vehicle. The most common fixes are: corroded or loose connector under a seat or in a door; wiring damage after seat or door work; crash sensor damaged by impact or water. Always confirm the cause with the tests above before buying parts.

Is it safe to drive with the airbag light on?

The car drives normally, but airbags may not deploy in an accident. Fix it as soon as possible.

Will the car pass inspection with the airbag light on?

In most countries no – an airbag fault is a reason to fail.

What is the difference between U0154 and similar codes?

U0154 belongs to a group of codes for the same component that differ in the type or location of the fault: U0151 – Lost Communication With Restraints Control Module; U0152 – Lost Communication With Side Restraints Control Module Left; U0153 – Lost Communication With Side Restraints Control Module Right; U0170 – Lost Communication With Restraints System Sensor A; U0171 – Lost Communication With Restraints System Sensor B; U0172 – Lost Communication With Restraints System Sensor C. The tests on this page apply to the whole group; the type of fault tells you where to start.

Related fault codes

This guide is for information only. Working on vehicles can be dangerous — if you are unsure, have the car checked by a qualified mechanic. Values can differ between model years; always check the manufacturer's repair information.