B1020 on 2007-2012 Nissan Altima — Airbag/SRS Deployment Loop Fault (Manufacturer-Specific)
1 vehicles · 1 makes · $250-$1,800 repair
Most Reported On
B1020 is an OBD-II diagnostic trouble code meaning “Airbag/SRS Deployment Loop Fault (Manufacturer-Specific).” B1020 is a manufacturer-specific body code; on GM-family vehicles it falls within the airbag (SIR/SRS) deployment-loop fault range, indicating the airbag module detected an electrical problem (such as a short or out-of-range resistance) in a deployment loop circuit. Because the exact loop and fault type vary by manufacturer and model, a make-specific scan tool and service manual are needed to confirm the precise circuit. As an SRS fault, the airbag warning light typically illuminates and proper airbag deployment may be affected, so it warrants prompt diagnosis. This code is most commonly reported on 2007-2012 Nissan Altima, with repair costs ranging from $250 to $1,800.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose B1020, 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 B1020 mean?
B1020 stands for "Airbag/SRS Deployment Loop Fault (Manufacturer-Specific)." B1020 is a manufacturer-specific body code; on GM-family vehicles it falls within the airbag (SIR/SRS) deployment-loop fault range, indicating the airbag module detected an electrical problem (such as a short or out-of-range resistance) in a deployment loop circuit. Because the exact loop and fault type vary by manufacturer and model, a make-specific scan tool and service manual are needed to confirm the precise circuit. As an SRS fault, the airbag warning light typically illuminates and proper airbag deployment may be affected, so it warrants prompt diagnosis.
What are the most common causes of B1020?
The most common causes of B1020 are: Open, shorted, or high-resistance wiring in an airbag deployment loop, Corroded, wet, or loose connector in the SRS circuit, Faulty clockspring (for steering-wheel-mounted airbag circuits), Faulty airbag inflator/module, Faulty airbag (SRS/SDM) control module, Harness damage from prior repair or accessory work, Poor ground connection. The specific cause varies by vehicle.
How much does it cost to fix B1020?
Repair costs for B1020 range from $250 to $1,800, depending on the vehicle and root cause.
Which vehicles are affected by B1020?
Au7o has documented B1020 across 1 vehicle models from 1 manufacturers: Nissan.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.