B142A on 2021-2023 Ford Bronco — Restraint System Ignition Voltage Supply Fault
1 vehicles · 1 makes
Most Reported On
B142A is an OBD-II diagnostic trouble code meaning “Restraint System Ignition Voltage Supply Fault.” B142A is a manufacturer-specific body/restraint code that, on several applications (e.g., Nissan), indicates a problem with the ignition/voltage supply to the airbag diagnosis (SRS) sensor unit, meaning the supply voltage is out of the expected range. The restraint module needs stable voltage to function, so this can illuminate the airbag warning light and compromise SRS readiness. Because it involves the safety-restraint system, it should be diagnosed promptly. Exact meaning varies by maker, so confirm with vehicle-specific data. This code is most commonly reported on 2021-2023 Ford Bronco.
Common Causes
Diagnostic Tools
To diagnose B142A, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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FAQ
What does B142A mean?
B142A stands for "Restraint System Ignition Voltage Supply Fault." B142A is a manufacturer-specific body/restraint code that, on several applications (e.g., Nissan), indicates a problem with the ignition/voltage supply to the airbag diagnosis (SRS) sensor unit, meaning the supply voltage is out of the expected range. The restraint module needs stable voltage to function, so this can illuminate the airbag warning light and compromise SRS readiness. Because it involves the safety-restraint system, it should be diagnosed promptly. Exact meaning varies by maker, so confirm with vehicle-specific data.
What are the most common causes of B142A?
The most common causes of B142A are: Faulty ignition switch or ignition-supply circuit, Damaged or corroded wiring to the SRS/airbag module, Loose or corroded connector at the restraint module, Weak battery or low charging-system voltage, Faulty airbag (SRS) diagnosis sensor unit, Blown fuse or poor ground in the supply circuit. The specific cause varies by vehicle.
How much does it cost to fix B142A?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by B142A?
Au7o has documented B142A across 1 vehicle models from 1 manufacturers: Ford.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.