AutoCodes – Generic – B0100

B0100 Code - Driver-Side EFS Valid Identification Not Received

Quick Answer

Electronic Frontal Sensor (EFS), also known as a front end sensor, uses a unidirectional 2-wire circuit. Common causes include Faulty Driver-Side Electronic Frontal Sensor (EFS), Driver-Side Electronic Frontal Sensor (EFS) harness is open or shorted, Driver-Side Electronic Frontal Sensor (EFS) circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B0100 indicates Driver-Side EFS Valid Identification Not Received.
Common causes: Common causes include Faulty Driver-Side Electronic Frontal Sensor (EFS), Driver-Side Electronic Frontal Sensor (EFS) harness is open or shorted, Driver-Side Electronic Frontal Sensor (EFS) circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 6,522

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B0100 Description

Electronic Frontal Sensor (EFS), also known as a front end sensor, uses a unidirectional 2-wire circuit. EFS sensor modulates current on the interface to send identification, State Of Health (SOH) and deployment commands to Sensing and Diagnostic Module (SDM). The SDM serves as a power source and ground for EFS. When ignition is turned on and EFS detects power from SDM, EFS responds by performing internal diagnostics and sending identification to SDM. SDM considers identification message to be valid if received within 5 seconds of EFS powering up. EFS continually communicates a status message to SDM. When fault is detected, SDM will attempt to reset EFS twice by removing and applying power. If fault is still present, SDM will set a Diagnostic Trouble Code (DTC).

OBDII Code B0100 - Driver-Side EFS Valid Identification Not Received - AutoCodes.com — B0100 Code - Driver-Side EFS Valid Identification Not Received

What does this mean?

What are the Possible Causes of the DTC B0100?

Faulty Driver-Side Electronic Frontal Sensor (EFS)
Driver-Side Electronic Frontal Sensor (EFS) harness is open or shorted
Driver-Side Electronic Frontal Sensor (EFS) circuit poor electrical connection
Faulty Sensing and Diagnostic Module (SDM)

How to Fix the DTC B0100?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B0100 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B0100 code?

Need more information on how to fix the B0100 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0100 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B0100 Buick — Driver-Side EFS Valid Identification Not Received
B0100 Cadillac — Driver-Side EFS Valid Identification Not Received
B0100 Chevrolet — Driver-Side EFS Valid Identification Not Received
B0100 GMC — Driver-Side EFS Valid Identification Not Received
B0100 Lexus — Short In D Squib Circuit
B0100 Pontiac — Driver-Side EFS Valid Identification Not Received
B0100 Saturn — Driver-Side EFS Valid Identification Not Received
B0100 Scion — Short In D Squib Circuit
B0100 Toyota — Short In D Squib Circuit

Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.

Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B0100 Code

1. What are the common symptoms of OBDII code B0100 (Driver-Side EFS Valid Identification Not Received)?

- The common symptoms include the airbag warning light being illuminated on the dashboard and potential issues with the driver-side airbag system.

2. What are the possible causes of OBDII code B0100?

- The code B0100 can be triggered by a faulty driver-side airbag sensor, damaged wiring in the airbag system, or a problem with the airbag control module.

3. How can I diagnose the cause of OBDII code B0100?

- To diagnose the cause of B0100, you will need a professional OBDII scanner to read the code and perform further troubleshooting on the driver-side airbag system components.

4. Is it safe to drive with OBDII code B0100 active?

- It is not recommended to drive with code B0100 active, as it indicates a potential issue with the driver-side airbag system, which could compromise your safety in the event of a collision.

5. Can I reset OBDII code B0100 myself?

- While you can clear the code temporarily with an OBDII scanner, it is crucial to address the underlying issue causing code B0100 to ensure the proper functioning of the driver-side airbag system.

6. How much does it typically cost to repair OBDII code B0100?

- The cost of repairing code B0100 can vary depending on the specific cause. It may involve replacing a faulty sensor, repairing damaged wiring, or reprogramming the airbag control module.

7. Are there any DIY repair tips for OBDII code B0100?

- DIY repair for B0100 is not recommended due to the safety implications of working on the airbag system. It is best to have the issue diagnosed and repaired by a qualified mechanic.

8. Can a low car battery trigger OBDII code B0100?

- A low car battery may not directly trigger B0100, but it can cause electrical issues that may lead to malfunctions in the driver-side airbag system, potentially triggering the code.

9. How long does it take to repair OBDII code B0100?

- The repair time for B0100 can vary depending on the cause and complexity of the issue. It may take anywhere from a few hours to a full day, depending on the extent of the repairs needed.

10. Is OBDII code B0100 a common issue in certain vehicle makes or models?

- OBDII code B0100 can occur in various vehicle makes and models with airbag systems, but it may be more common in certain vehicles known for airbag system issues.