Network communication (U-codes) · Network · generic (SAE-defined)
U0151: Lost Communication With Restraints Control Module
U0151 means other modules lost network contact with the restraints control module (RCM), which controls the airbags and seat belt pretensioners.
Standard title per SAE J2012 / ISO 15031-6 · Updated 2026-11-07 · By CarWhere Research
How U0151 sets
The RCM, sometimes called the airbag module, reports its status over the controller area network (CAN). When other modules stop receiving its messages for longer than allowed, they store U0151, and the airbag warning light is typically commanded on. Conditions vary by manufacturer.
Common causes of U0151
Roughly most likely first; the actual cause depends on the vehicle and needs testing to confirm.
- Blown airbag system fuse
- Corroded or loose RCM connector
- Poor RCM ground
- Damaged CAN wiring to the RCM
- Low battery voltage
- Failed RCM, sometimes after water exposure or a collision
U0151 symptoms
- Airbag warning light on
- Passenger airbag status indicator incorrect
- Other modules storing communication codes
- Usually no change in how the vehicle drives
How U0151 is diagnosed
- Scan all modules and check whether the RCM communicates directly with the scan tool.
- Check battery voltage and the airbag system fuse.
- Follow factory safety procedures, including disconnecting the battery and waiting the specified time, before handling any airbag wiring.
- Inspect the RCM connector and ground, which are often under the seats or center console.
- Check CAN wiring continuity to the RCM.
- Have the module tested or replaced by a qualified technician if power, ground, and network checks pass.
Typical fixes for U0151
- Replace the blown fuse and correct the cause
- Repair the RCM connector or ground
- Repair CAN wiring
- Replace and program the RCM if confirmed faulty, following factory procedures
Replace parts only after testing confirms the cause — a code names the circuit or condition that failed a check, not necessarily the faulty part. We don’t publish per-repair prices; for what households actually spend on upkeep, see car repair costs.
Related codes & warning lights
U0151 FAQ
What does code U0151 mean?
U0151 means other modules lost network contact with the restraints control module (RCM), which controls the airbags and seat belt pretensioners. The standard definition is "Lost Communication With Restraints Control Module."
Can I drive with a U0151 code?
The vehicle may drive normally, but assume the airbags and pretensioners may not deploy in a crash. Get it diagnosed as soon as possible and limit driving until the system is confirmed working.
Are my airbags disabled with U0151?
They may be. When the restraints module cannot be confirmed to be working, it is safest to assume airbags and pretensioners may not deploy.
Can I repair airbag wiring myself?
Airbag systems can deploy unexpectedly if mishandled, so work on them is best left to trained technicians who follow factory safety procedures.
Keep researching
More network communication (u-codes) codes
Sources
- SAE J2012 — Diagnostic Trouble Code Definitions (standard code titles)
- ISO 15031-6 — Road vehicles: communication between vehicle and external equipment for emissions-related diagnostics, Part 6: Diagnostic trouble code definitions
- U.S. EPA — Vehicle Emissions Inspection and Maintenance (I/M) programs
- U.S. EPA, 40 CFR 86.1806-17 — Federal onboard diagnostics requirements for light-duty vehicles
General information written by CarWhere Research, not a diagnosis of your vehicle. Manufacturers can add their own sub-definitions and test conditions; confirm with the factory service information for your year, make and model. Before paying for a repair, check NHTSA for open recalls and your warranty booklet: federal law requires an emissions warranty on major emission-control parts such as the catalytic converter and engine computer.