B1018 on Nissan
Passenger Deployment Loop Short to Ground (Manufacturer-Specific)
B1018 on Nissan vehicles indicates passenger deployment loop short to ground (manufacturer-specific). Au7o has documented this code across 2 Nissan models — most commonly on Altima, Leaf. B1018 is a manufacturer-specific SRS/airbag code that, on GM-family vehicles, indicates the passenger airbag deployment loop circuit is shorted to ground. The airbag module continuously monitors the resistance of each deployment loop, and a short to ground in the passenger circuit is an electrical fault that can prevent proper deployment. The airbag warning light will be on and the passenger airbag may not fire correctly in a crash, so it should be diagnosed promptly. Typical repair costs on Nissan range from $250 to $5,000, depending on the specific model and root cause.
Common Causes of B1018
- •Chafed or pinched wiring shorting the passenger deployment loop to ground
- •Corroded or wet connector in the passenger airbag circuit (often the clockspring or under-dash connector)
- •Faulty passenger airbag inflator/module
- •Damaged harness from prior repair or accessory installation
- •Loose or backed-out connector pin
- •Faulty airbag (SRS/SDM) control module
- •Water intrusion at a floor or seat connector
B1018 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.
Nissan Leaf(1 issue)
- Passenger Airbag Occupant Classification (OCS) Sensor Failure2011-2012
The passenger seat's Occupant Classification System (OCS) sensor mat can fail, causing the 'Passenger Airbag OFF' light to stay illuminated even with an adult in the seat, deactivating the passenger airbag. NHTSA opened (and later closed) an investigation into 2011-2012 Leafs for this defect, and owners set a B1018 seat-sensor DTC. Nissan recalled 2013-2016 Leafs for a related airbag/OCS issue but excluded 2011-2012 because the system differs, leaving those owners to pay out of pocket. The costly part: the OCS mat is integrated into the seat, so the fix often requires replacing the entire passenger seat (owners report $3,000-$5,000).
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View B1018 across all makes →Frequently Asked Questions
What does B1018 mean on Nissan?▼
B1018 stands for "Passenger Deployment Loop Short to Ground (Manufacturer-Specific)." B1018 is a manufacturer-specific SRS/airbag code that, on GM-family vehicles, indicates the passenger airbag deployment loop circuit is shorted to ground. The airbag module continuously monitors the resistance of each deployment loop, and a short to ground in the passenger circuit is an electrical fault that can prevent proper deployment. The airbag warning light will be on and the passenger airbag may not fire correctly in a crash, so it should be diagnosed promptly. On Nissan specifically, this code is documented across 2 models.
What causes B1018 on Nissan vehicles?▼
Common causes on Nissan: Chafed or pinched wiring shorting the passenger deployment loop to ground, Corroded or wet connector in the passenger airbag circuit (often the clockspring or under-dash connector), Faulty passenger airbag inflator/module, Damaged harness from prior repair or accessory installation, Loose or backed-out connector pin. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix B1018 on a Nissan?▼
Repair costs on Nissan range from $250 to $5,000, depending on the specific model and root cause.
Which Nissan models have B1018 documented?▼
Au7o has documented B1018 on 2 Nissan models: Altima, Leaf.