B0100 on Chevrolet: How to Diagnose & Fix
Electronic Frontal Sensor 1 Malfunction
1 Chevrolet model · 1 documented issue · 1 critical
B0100 on Chevrolet by model: symptoms, diagnosis and fix
The 2000-2005 Impala was included in GM's 2014 ignition key recall 14V-400, which covered 5,877,718 vehicles across several GM models. The weight on the key ring and/or road conditions or some other jarring event can cause the ignition switch to move from the "Run" position to the "Accessory" or "Off" position while driving. When this happens, the engine shuts off, the power steering and brake boost are lost, and the airbags may not deploy — all without warning. The issue is exacerbated by heavy key chains that add weight and leverage on the ignition cylinder.
Common Symptoms
- Engine shuts off unexpectedly while driving
- Key turns to accessory position on its own
- Airbag warning light illuminated
- Power steering lost suddenly
- Dashboard goes dark momentarily while driving
- Stalling when hitting bumps or turning
How to Fix
Check the NHTSA recall database (NHTSA.gov) with your VIN — this is recall 14V-400 (GM recall 14350) and the repair is FREE at any GM dealer regardless of mileage or ownership history. The dealer installs two key rings and an insert in the key slot or a cover over the key head on all ignition keys. Until the recall is completed, remove all extra keys and accessories from your key chain — use only the vehicle key with nothing else attached. NEVER ignore this recall; it is a critical safety issue.
Sources for this issue (1)
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 Chevrolet?
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 Chevrolet it is documented across 1 model: Impala.
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 Chevrolet?
Repair costs vary widely with the root cause and Chevrolet model; each issue on this page carries its own estimate where one is published.
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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.