B0102: How to Diagnose & Fix — Electronic Side Sensor Malfunction
2 vehicles · 2 makes
How to diagnose and fix B0102: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Toyota 4Runner · 2010–2016
Takata airbag inflators can explode during deployment, sending metal shrapnel at occupants. This is a critical safety recall affecting millions of vehicles. On the 2010-2016 4Runner, the front passenger airbag inflator needs replacement (NHTSA recall 19V-005; the model years covered depend on the state where the vehicle is registered). Multiple deaths and injuries have been linked to this defect.
Common Symptoms
- Recall notice received
- Airbag warning light (unrelated symptom)
- No symptoms - defect is hidden
How to Fix
Check VIN immediately at NHTSA.gov, SaferCar.gov, or Toyota's recall website. Repairs are free at any Toyota dealer. Do not delay - this is a life-threatening defect. If parts are unavailable, Toyota may provide a loaner vehicle. This recall never expires.
Owner tips & cautions
- WarningThis is a high-severity issue - ignoring it can lead to costly repairs or safety concerns. Address it promptly.
- TipGet a proper diagnosis before replacing parts - similar symptoms can have different causes
- TipSearch Toyota 4Runner forums and owner groups for real-world experiences and DIY guides
- TipGet multiple quotes from independent mechanics - dealer prices can be 2-3x higher for the same repair
- TipCheck NHTSA.gov for active recalls — repairs are performed free at authorized dealers
Sources for this issue (5)
- NHTSA Recall 19V-005: Toyota passenger frontal air bag inflators (incl. 2010-2016 4Runner)government
- Toyota Pressroom: Toyota is conducting final phase of Takata airbag safety recallmanufacturer
- Toyota: Look up Safety Recalls & Service Campaigns by VIN (Takata)manufacturer
- Consumer Reports: Toyota Recall to Replace Airbags Again | Takatamedia
- Toyota 4Runner Forum: Takata Airbag Recallforum
Jeep Grand Wagoneer · 2022–2023
Multiple safety recalls affect the Grand Wagoneer airbag system. Recall 21V-873: The Occupant Restraint Controller (ORC) may have incorrect software that disables driver, passenger, and knee airbags. Recall 23V-545: The upper B-pillar interior trim may not be fully seated and could interfere with side curtain airbag deployment. Both issues prevent airbags from deploying properly in a crash.
Common Symptoms
- Airbag warning light on dashboard
- Service airbag system message
- Loose or improperly seated B-pillar trim
- No visible symptoms (software defect)
How to Fix
Contact dealer immediately for both recalls. Recall 21V-873: Dealer will update the ORC module software at no cost. Recall 23V-545: Dealer will inspect and properly reseat the B-pillar trim, replacing if necessary, at no cost. Both repairs are covered under safety recall. Check VIN at recalls.mopar.com.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
Owner tips & cautions
- WarningThese are critical safety recalls - airbags may not deploy in a crash. Schedule dealer visit immediately even if no warning lights are present
- TipCheck your VIN at recalls.mopar.com for both recall numbers (21V-873 and 23V-545)
- TipCheck NHTSA.gov for active recalls — repairs are performed free at authorized dealers
Sources for this issue (2)
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B0102 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does B0102 mean?
B0102 stands for "Electronic Side Sensor Malfunction." This body/safety code indicates a malfunction with an electronic crash sensor used by the airbag (SRS) system, typically a frontal or side impact sensor on one side of the vehicle. The airbag control module continuously checks these sensors so it can deploy airbags and tensioners correctly in a crash, and it sets this code when a sensor reports an incorrect identity, fails, or its circuit is faulty. The airbag warning light will usually be on. Because it can compromise crash protection, it should be diagnosed promptly.
What are the most common causes of B0102?
The most common causes of B0102 are: Faulty electronic side/frontal impact sensor, Open, shorted, or damaged sensor wiring harness, Corroded or loose sensor connector, Wrong or incompatible replacement sensor installed, Damage from a prior collision or water intrusion, Poor ground or connection in the SRS circuit, Faulty airbag control module (less common). The specific cause varies by vehicle.
How much does it cost to fix B0102?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by B0102?
Au7o has documented B0102 across 2 vehicle models from 2 manufacturers: Jeep, Toyota.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.