AutoCodes – Cadillac – B0104 Cadillac

B0104 Cadillac Code - Passenger-Side EFS Not Okay Message

Quick Answer

Electronic Frontal Sensor (EFS), also known as a front end sensor, uses a unidirectional 2-wire circuit. Common causes include Faulty Passenger-Side Electronic Frontal Sensor (EFS), Passenger-Side Electronic Frontal Sensor (EFS) harness is open or shorted, Passenger-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: B0104 Cadillac indicates Passenger-Side EFS Not Okay Message.
Common causes: Common causes include Faulty Passenger-Side Electronic Frontal Sensor (EFS), Passenger-Side Electronic Frontal Sensor (EFS) harness is open or shorted, Passenger-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 2,001

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 B0104 Cadillac 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 B0104 Cadillac - Passenger-Side EFS Not Okay Message - AutoCodes.com — B0104 Cadillac Code - Passenger-Side EFS Not Okay Message

What does this mean?

What are the Possible Causes of the DTC B0104 Cadillac?

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

How to Fix the DTC B0104 Cadillac?

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 B0104 Cadillac 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.

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Need more information on how to fix the B0104 Cadillac code? Get Access to Factory Service Manuals

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Get the B0104 Cadillac 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 B0104 Cadillac Code

1. What are the common symptoms of OBDII code B0104 in a Cadillac related to the Passenger-Side EFS Not Okay Message?

- Common symptoms include the airbag warning light staying illuminated, an error message indicating "Passenger-Side EFS Not Okay," and potential issues with the passenger-side airbag system.

2. What can cause the OBDII code B0104 in a Cadillac to trigger the Passenger-Side EFS Not Okay Message?

- Possible causes include a faulty passenger-side airbag sensor, a wiring issue in the airbag system, or a malfunction in the electronic control unit (ECU) that controls the airbag system.

3. How can I diagnose the OBDII code B0104 in a Cadillac related to the Passenger-Side EFS Not Okay Message?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific fault code, inspecting the passenger-side airbag sensor and related wiring for damage, and checking the ECU for any faults.

4. Is it safe to drive my Cadillac with the OBDII code B0104 triggering the Passenger-Side EFS Not Okay Message?

- It is not recommended to drive the vehicle with this code present, as it indicates a potential issue with the passenger-side airbag system, which could affect its functionality in the event of a collision.

5. What are the repair options for fixing the OBDII code B0104 in a Cadillac showing the Passenger-Side EFS Not Okay Message?

- Repair options may include replacing the passenger-side airbag sensor, repairing any damaged wiring in the airbag system, or reprogramming the ECU to address any software-related issues.

6. Can I reset the OBDII code B0104 in a Cadillac related to the Passenger-Side EFS Not Okay Message myself?

- While you can clear the fault code with an OBDII scanner, it is essential to address the underlying issue causing the code to prevent it from recurring and ensure the safety of the airbag system.

7. How much does it typically cost to repair the OBDII code B0104 in a Cadillac with the Passenger-Side EFS Not Okay Message?

- The cost of repair can vary depending on the specific cause of the code, but it may range from $100 to $500 or more, including parts and labor.

8. Are there any recalls or technical service bulletins related to the OBDII code B0104 in a Cadillac displaying the Passenger-Side EFS Not Okay Message?

- It is recommended to check with a Cadillac dealership or the National Highway Traffic Safety Administration (NHTSA) website for any relevant recalls or technical service bulletins related to this issue.

9. Will fixing the OBDII code B0104 in a Cadillac with the Passenger-Side EFS Not Okay Message affect the vehicle's safety rating?

- Addressing and resolving the issue causing the code may improve the safety of the vehicle, particularly concerning the proper functioning of the passenger-side airbag system in the event of a collision.

10. Can the OBDII code B0104 in a Cadillac displaying the Passenger-Side EFS Not Okay Message affect the vehicle's overall performance?

- While this code specifically relates to the passenger-side airbag system, addressing it promptly can ensure that all safety features function correctly, maintaining the overall safety and performance of the vehicle.