AutoCodes – Saturn – B0100 Saturn

B0100 Saturn 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 Saturn 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 1,738

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

What does this mean?

What are the Possible Causes of the DTC B0100 Saturn?

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 Saturn?

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 Saturn 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 Saturn code?

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

Need Help with the Code?

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

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 Saturn Code

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

The common symptoms include the airbag warning light illuminated on the dashboard, potential loss of airbag functionality, and diagnostic trouble code B0100 stored in the vehicle's computer.

2. What are the possible causes of OBDII code B0100 (Saturn) â€“ Driver-Side EFS Valid Identification Not Received?

Possible causes may include a faulty electronic front sensor (EFS), damaged wiring or connectors in the airbag system, a malfunctioning airbag control module, or a problem with the clock spring.

3. How can I diagnose the issue related to OBDII code B0100 (Saturn)?

Diagnosing the issue may involve using a compatible OBDII scanner to retrieve the specific trouble code, inspecting the wiring and connectors in the airbag system, and testing the electronic front sensor (EFS) for proper functionality.

4. Can I still drive my Saturn if OBDII code B0100 is present?

It is not recommended to drive the vehicle if the airbag warning light is illuminated, as it indicates a potential issue with the airbag system. It is advised to have the problem diagnosed and repaired before driving.

5. How can I repair OBDII code B0100 (Saturn) â€“ Driver-Side EFS Valid Identification Not Received?

Repairing the issue may involve replacing the faulty electronic front sensor (EFS), repairing or replacing damaged wiring or connectors, resetting the airbag control module, or addressing any other underlying cause identified during diagnosis.

6. Is it safe to reset the airbag warning light after fixing OBDII code B0100?

It is safe to reset the airbag warning light using an OBDII scanner after resolving the underlying issue related to code B0100. This will clear the stored trouble code and verify if the repair was successful.

7. Can I fix OBDII code B0100 (Saturn) myself, or do I need professional help?

While some DIY enthusiasts may attempt to diagnose and repair the issue themselves, dealing with airbag systems can be complex and potentially dangerous. It is recommended to seek professional help to ensure the problem is addressed correctly and safely.

8. How much does it cost to repair OBDII code B0100 (Saturn)?

The cost of repairing OBDII code B0100 can vary depending on the specific cause of the issue, parts needed for replacement, and labor costs. It is advisable to get a diagnosis from a qualified mechanic to determine the exact repair costs.

9. Will OBDII code B0100 (Saturn) affect my vehicle's safety in case of an accident?

Having OBDII code B0100 present indicates a potential issue with the airbag system, which could affect the proper deployment of the airbags in case of an accident. It is crucial to address the problem promptly to ensure the safety features function correctly.

10. How long does it take to repair OBDII code B0100 (Saturn)?

The repair time for OBDII code B0100 can vary depending on the specific cause of the issue, availability of parts, and the mechanic's expertise. It is recommended to consult with a professional to get an estimate of the repair time for your specific situation.