U0153: Lost Communication With Restraints Control Module B

What it means

A control module has stopped receiving expected messages from restraints control module B. Restraint functions associated with that module may be limited or unavailable.

At a glance

• Usually lights the warning light of the system that lost communication

How it works

Restraints Control Module B is a designated restraint-system controller that exchanges status with other modules over CAN. U0153 sets when the reporting controller stops receiving expected messages specifically from module B, which can make restraint functions assigned to it unavailable.

Common causes

Most likely first.

1. Restraints control module B power or ground fault
2. Damaged network wiring or connector
3. Restraints control module B failure
4. Low system voltage

Symptoms

• Airbag or SRS warning
• Restraint system functions may be unavailable
• Other communication codes

How to diagnose it

1. Scan all modules and record SRS and network codes to determine whether module B alone is offline or whether several controllers are affected.
2. Check the 12-volt battery and charging system, because low voltage can interrupt communication with module B.
3. Inspect accessible module B connectors and harnesses for damage or corrosion without probing or disturbing airbag or pretensioner circuits.
4. Use the vehicle-specific wiring diagram and safety procedure to verify module B's specified power, ground, and fuses.
5. Test the CAN connection to module B according to the manufacturer's procedure if its power and ground are correct.
6. If circuit checks pass, verify module B response and any required configuration with suitable SRS-capable equipment.

Common fixes

• Restore a weak 12-volt battery or repair its charging-system fault.
• Replace a blown fuse or repair a verified power or ground fault to module B.
• Repair damaged network wiring or connectors using restraint-system safety procedures.
• Correct a confirmed network routing or configuration issue affecting module B.
• Replace or configure Restraints Control Module B only after its supplies and network have passed checks.

Can I keep driving?

Treat an SRS warning as a safety fault because restraint functions assigned to module B may not work in a crash. Limit driving and arrange prompt diagnosis; do not disturb restraint wiring unless trained and following the vehicle's safety procedure.