AutoCodes – Generic – B0102

B0102 Code - Driver-Side EFS Incorrect Identification Message

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: B0102 indicates Driver-Side EFS Incorrect Identification Message.
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 5,374

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 B0102 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 B0102 - Driver-Side EFS Incorrect Identification Message - AutoCodes.com — B0102 Code - Driver-Side EFS Incorrect Identification Message

What does this mean?

What are the Possible Causes of the DTC B0102?

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 B0102?

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 B0102 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 B0102 code?

Need more information on how to fix the B0102 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0102 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B0102 Buick — Driver-Side EFS Incorrect Identification Message
B0102 Cadillac — Driver-Side EFS Incorrect Identification Message
B0102 Chevrolet — Driver-Side EFS Incorrect Identification Message
B0102 GMC — Driver-Side EFS Incorrect Identification Message
B0102 Lexus — Short To Ground In D Squib Circuit
B0102 Pontiac — Driver-Side EFS Incorrect Identification Message
B0102 Saturn — Driver-Side EFS Incorrect Identification Message
B0102 Scion — Short To Ground In D Squib Circuit
B0102 Toyota — Short To Ground 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 B0102 Code

1. What are the common symptoms of OBDII code B0102 (Driver-Side EFS Incorrect Identification Message)?

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

2. What can cause OBDII code B0102 to trigger?

This code may be triggered by a faulty electronic front sensor (EFS), a malfunction in the wiring harness connecting the EFS, or a problem with the airbag control module.

3. How serious is OBDII code B0102?

This code is serious as it indicates a potential issue with the driver-side airbag system, which could affect its proper deployment in the event of a collision. It is recommended to address this issue promptly.

4. Can I continue driving with OBDII code B0102 present?

It is not recommended to continue driving with this code present, as it could mean that the driver-side airbag system is compromised. It is best to have the issue diagnosed and repaired as soon as possible.

5. How can I diagnose OBDII code B0102?

Diagnosing this code typically involves using a diagnostic scanner to retrieve the trouble codes, followed by inspecting the EFS, wiring harness, and airbag control module for any signs of damage or malfunction.

6. What are some repair tips for fixing OBDII code B0102?

Repair tips include checking and repairing any damaged wiring, replacing the faulty EFS if necessary, and resetting the airbag control module to clear the code.

7. Can I reset OBDII code B0102 without fixing the underlying issue?

While you can clear the code temporarily by resetting the system, the underlying issue causing the code will persist. It is important to address the root cause of the problem to prevent the code from reoccurring.

8. How much does it cost to repair OBDII code B0102?

The cost of repairing this code can vary depending on the extent of the issue and the parts that need to be replaced. It is recommended to consult a professional mechanic for an accurate estimate.

9. Does OBDII code B0102 affect vehicle performance?

This code typically does not affect vehicle performance directly, but it can compromise the safety features of the driver-side airbag system. It is important to address the issue promptly to ensure proper functioning of the airbag in case of an accident.

10. Can I fix OBDII code B0102 myself?

While some DIY enthusiasts may be able to diagnose and repair this code themselves, it is recommended to seek professional help, especially when dealing with safety-critical systems like the airbag system.