B0100 on Toyota: How to Diagnose & Fix
Electronic Frontal Sensor 1 Malfunction
2 Toyota models · 2 documented issues · 2 critical
B0100 on Toyota by model: symptoms, diagnosis and fix
Takata airbag inflators can explode during deployment, sending metal shrapnel at occupants. This is a critical safety recall affecting millions of vehicles. The driver and/or passenger airbag inflators need replacement. 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)
- 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
- Toyota: DO NOT DRIVE Advisory for Certain 2003-2005 Models with Recalled Takata Airbagsmanufacturer
NHTSA Recall 14V-168 / Toyota E0M covers certain 2006-2008 RAV4s produced from late July 2005 through early August 2008 and equipped with a seven-channel spiral cable. A flexible flat cable inside the assembly can contact its retainer and wear as the steering wheel is turned. If the driver's-airbag circuit loses connectivity, the SRS warning lamp may illuminate and the driver's frontal airbag can be deactivated, increasing injury risk in a crash. Not every RAV4 in these model years has the affected assembly, and the documented RAV4 recall does not extend through 2012.
Common Symptoms
- SRS warning lamp remains illuminated after the ignition self-check
- SRS warning lamp fails to illuminate during its normal self-check
- Driver frontal airbag circuit loses connectivity without a guaranteed warning
How to Fix
Check the complete VIN at Toyota's recall lookup or with an authorized Toyota dealer for open campaign E0M / NHTSA 14V-168. For an eligible incomplete vehicle, Toyota replaces the spiral cable assembly with an improved unit at no charge. Until status is confirmed and any open remedy is completed, pay close attention to the SRS lamp's ignition self-check; if it fails to illuminate, stays on or returns after the check period, arrange prompt dealer diagnosis. The lamp can have unrelated causes, and Toyota notes that the recalled condition may exist without a warning, so do not use lamp behavior alone to decide eligibility. Do not disassemble an airbag-equipped steering column without the factory SRS precautions.
Owner tips & cautions
- TipUse the full VIN to distinguish an open E0M recall, a completed campaign and a vehicle that was never in the seven-channel population.
- WarningAn abnormal SRS-lamp check means the airbag system needs prompt diagnosis; do not assume the driver airbag will deploy normally or clear the lamp without finding the cause.
Sources for this issue (3)
B0100 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 B0100 mean on a Toyota?
B0100 stands for "Electronic Frontal Sensor 1 Malfunction." This is a body code in the airbag (SRS) system indicating a malfunction with electronic frontal impact sensor 1, one of the crash sensors that detects a frontal collision and tells the airbag controller when to deploy. The system runs a self-check on these sensors and their wiring, and when sensor 1 fails to communicate properly, reads out of range, or shows a circuit fault, this code sets and usually lights the airbag warning lamp. Because it affects crash protection, the airbags or seatbelt pretensioners may not deploy as designed until it's fixed. It generally points to a faulty sensor, its wiring/connector, or the airbag control module. On Toyota it is documented across 2 models: 4Runner, RAV4.
What are the most common causes of B0100?
The most common causes of B0100 are: Faulty frontal impact (crash) sensor, Damaged, open, or shorted sensor wiring, Corroded or unseated sensor connector, Connector damage from a prior collision or repair, Poor ground or power supply to the sensor, Faulty airbag (SRS) control module. The specific cause varies by vehicle.
How much does it cost to fix B0100 on a Toyota?
Repair costs vary widely with the root cause and Toyota model; each issue on this page carries its own estimate where one is published.
Looking for B0100 on a different make?
View B0100 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.