AutoCodes – GMC – B0102 GMC

B0102 GMC 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 GMC 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 1,414

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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

What does this mean?

What are the Possible Causes of the DTC B0102 GMC?

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 GMC?

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 GMC 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 GMC code?

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

Need Help with the Code?

Get the B0102 GMC 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 B0102 GMC Code

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

- Common symptoms include the airbag warning light illuminating on the dashboard and a message indicating "Driver-Side EFS Incorrect Identification" displayed on the vehicle's information screen.

2. What are the possible causes of OBDII code B0102 GMC?

- The code B0102 GMC is typically triggered by a malfunction in the electronic front sensor (EFS) located on the driver's side airbag system. This can be due to a faulty sensor, wiring issues, or a communication error within the system.

3. How can I diagnose the cause of OBDII code B0102 GMC?

- Diagnosing the cause of code B0102 GMC involves using a scan tool to retrieve the trouble codes, checking the wiring and connections to the driver-side EFS, and performing a visual inspection of the sensor for any signs of damage or corrosion.

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

- It is not recommended to continue driving the vehicle with the airbag warning light illuminated and the driver-side EFS incorrect identification message displayed. This indicates a potential issue with the airbag system, which is a critical safety component.

5. How should I repair OBDII code B0102 GMC?

- Repairing code B0102 GMC may involve replacing the driver-side EFS sensor, repairing any damaged wiring or connectors, or resetting the airbag system using a scan tool after the issue has been addressed.

6. Are there any DIY tips for fixing OBDII code B0102 GMC?

- While some basic troubleshooting steps can be taken, diagnosing and repairing OBDII code B0102 GMC often requires specialized tools and expertise. It is recommended to seek professional help to ensure the airbag system is properly repaired.

7. Can a faulty driver-side EFS sensor cause other issues in the vehicle?

- A faulty driver-side EFS sensor can impact the proper functioning of the airbag system, which is designed to deploy in the event of a collision. It is essential to address this issue promptly to ensure the airbag system's effectiveness.

8. How do I reset the airbag warning light after repairing OBDII code B0102 GMC?

- After repairing the underlying issue causing code B0102 GMC, the airbag warning light can typically be reset using a scan tool capable of clearing trouble codes in the airbag system.

9. Is OBDII code B0102 GMC a common issue in GMC vehicles?

- While the prevalence of OBDII code B0102 GMC may vary, issues with the driver-side EFS sensor can occur in GMC vehicles equipped with airbag systems that utilize this sensor.

10. How can I prevent OBDII code B0102 GMC from recurring in the future?

- To prevent OBDII code B0102 GMC from recurring, it is essential to address any underlying issues promptly, perform regular maintenance checks on the airbag system, and follow the manufacturer's recommended service intervals for the vehicle's safety components.