U0154

Lost Communication With Restraints Occupant Classification System Module

Q: Is it safe to drive with U0154?

The car drives, but treat it as a safety issue: the passenger airbag may not arm or disarm correctly. Have the restraints system repaired promptly, and don't assume the passenger airbag will behave as expected.

Q: Can I just clear U0154?

No — restraint faults return until repaired, and clearing an airbag code without fixing it leaves an unreliable passenger airbag. Fix the wiring or module first.

Communication network (airbag/restraints) Generic OBD-II Medium

What it means

U0154 means the restraints system has lost communication with the occupant classification module — the unit under the passenger seat that senses whether an adult, child, or nobody is seated and tells the system whether to arm the passenger airbag. The car still drives, but the airbag light comes on and the passenger airbag may arm or disarm incorrectly, so it's a genuine safety fault. Typical causes are damaged seat wiring or connectors, a power/ground fault, or a failed module.

Medium

Can I keep driving? Drivable, but a safety concern — the passenger airbag on/off decision depends on this module, so the airbag light will be on and passenger restraint behavior may be wrong.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Airbag/SRS warning light on
Passenger airbag on/off indicator wrong or unlit
Passenger airbag may stay disabled (or fail to disable for a child seat)
Restraints control module reports lost communication with the occupant classification module

Common causes

Most likely first

Damaged or corroded connector/wiring under the passenger seatLikely
No power or ground to the occupant classification moduleCommon
Seat wiring harness damaged by seat movement or spillsCommon
Internally failed occupant classification moduleLess often

How to diagnose & fix

Work through it in order

Scan the restraints system and confirm the occupant classification module is not communicating.
Inspect the wiring and connector under the passenger seat for damage, corrosion, and unseated pins.
Check power and ground to the module.
Repair the seat harness or connector; recalibrate/zero the system if the procedure requires it.
If it still won't communicate, replace the module per the service procedure, then clear and re-test.

FAQ

Quick answers

Is it safe to drive with U0154?+

The car drives, but treat it as a safety issue: the passenger airbag may not arm or disarm correctly. Have the restraints system repaired promptly, and don't assume the passenger airbag will behave as expected.

Can I just clear U0154?+

No — restraint faults return until repaired, and clearing an airbag code without fixing it leaves an unreliable passenger airbag. Fix the wiring or module first.

Read & clear U0154 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX