B0100 on Toyota
Electronic Frontal Sensor 1 Malfunction
B0100 on Toyota vehicles indicates electronic frontal sensor 1 malfunction. Au7o has documented this code across 2 Toyota models — most commonly on 4Runner, RAV4. 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.
Common Causes of B0100
- •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
B0100 on Toyota by Model
Toyota 4Runner(1 issue)
- Takata Airbag Recall2010-2016
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.
Toyota RAV4(1 issue)
- Occupant Classification Sensor Short Circuit / Airbag Non-Deployment2020-2022
The Occupant Classification System (OCS) sensor in the front passenger seat may have been improperly manufactured, causing a short circuit. This can prevent the front passenger airbag from deploying in a crash when it should. Part of a 1.12 million vehicle recall.
Looking for B0100 on a different make?
View B0100 across all makes →Frequently Asked Questions
What does B0100 mean on 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 specifically, this code is documented across 2 models.
What causes B0100 on Toyota vehicles?▼
Common causes on Toyota: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix B0100 on a Toyota?▼
Repair costs vary widely depending on the root cause and specific Toyota model.
Which Toyota models have B0100 documented?▼
Au7o has documented B0100 on 2 Toyota models: 4Runner, RAV4.