B1020 on Nissan
Airbag/SRS Deployment Loop Fault (Manufacturer-Specific)
B1020 on Nissan vehicles indicates airbag/srs deployment loop fault (manufacturer-specific). Au7o has documented this code across 1 Nissan model — most commonly on Altima. 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. Typical repair costs on Nissan range from $250 to $1,800, depending on the specific model and root cause.
Common Causes of B1020
- •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
B1020 on Nissan by Model
Nissan Altima(1 issue)
- Passenger Occupant Classification Sensor / Air Bag Warning Light Fault2007-2012
Multiple 2007-2012 Altima owners report the air bag warning light flashing and the passenger air bag status behaving incorrectly due to faults in the occupant classification system (OCS) or related seat sensor components. This can disable the passenger frontal air bag when it should be enabled, or trigger a persistent SRS warning light. Nissan issued service information and warranty extensions on some related OCS concerns because the issue was common enough to generate many complaints and dealer repairs.
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View B1020 across all makes →Frequently Asked Questions
What does B1020 mean on Nissan?▼
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. On Nissan specifically, this code is documented across 1 model.
What causes B1020 on Nissan vehicles?▼
Common causes on Nissan: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix B1020 on a Nissan?▼
Repair costs on Nissan range from $250 to $1,800, depending on the specific model and root cause.
Which Nissan models have B1020 documented?▼
Au7o has documented B1020 on 1 Nissan model: Altima.