AutoCodes – Hummer – B0078 Hummer

B0078 Hummer Code - Right Front/Passenger Side Impact Sensor Performance

Quick Answer

The Inflatable Restraint Side Impact Sensor (SIS) utilizes a unidirectional 2-wire circuit. Common causes include Faulty Right Front/Passenger Side Impact Sensor (SIS), Right Front/Passenger Side Impact Sensor (SIS) harness is open or shorted, Right Front/Passenger Side Impact Sensor (SIS) 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: B0078 Hummer indicates Right Front/Passenger Side Impact Sensor Performance.
Common causes: Common causes include Faulty Right Front/Passenger Side Impact Sensor (SIS), Right Front/Passenger Side Impact Sensor (SIS) harness is open or shorted, Right Front/Passenger Side Impact Sensor (SIS) 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 2,934

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 B0078 Hummer Description

The Inflatable Restraint Side Impact Sensor (SIS) utilizes a unidirectional 2-wire circuit. The SIS modulates current on the interface to send ID, State of Health, and deployment commands to the Inflatable Restraint Sensing and Diagnostic Module (SDM). The SDM serves as a power source and a ground for the SIS. When the ignition is turned on and input power from the SDM is first detected, the SIS responds by performing internal diagnostics and sending an ID to the SDM. The SDM considers the ID to be valid if the response time is less than 5 seconds. The SIS continually communicates status messages to the SDM, which determines if a fault is present in the SIS circuit. When a fault is detected, the SDM resets the SIS twice by removing and reapplying power. If the fault is still present, the SDM will set a Diagnostic Trouble Code (DTC).

OBDII Code B0078 Hummer - Right Front/Passenger Side Impact Sensor Performance - AutoCodes.com — B0078 Hummer Code - Right Front/Passenger Side Impact Sensor Performance

What does this mean?

What are the Possible Causes of the DTC B0078 Hummer?

Faulty Right Front/Passenger Side Impact Sensor (SIS)
Right Front/Passenger Side Impact Sensor (SIS) harness is open or shorted
Right Front/Passenger Side Impact Sensor (SIS) circuit poor electrical connection
Faulty Inflatable Restraint Sensing and Diagnostic Module (SDM)

How to Fix the DTC B0078 Hummer?

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 B0078 Hummer 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 B0078 Hummer code?

Need more information on how to fix the B0078 Hummer code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0078 Hummer 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 B0078 Hummer Code

1. What are the common symptoms of OBDII code B0078 in a Hummer?

- Common symptoms include the airbag warning light illuminating on the dashboard and potential issues with the right front/passenger side impact sensor.

2. What can cause the OBDII code B0078 in a Hummer?

- The B0078 code is typically triggered by a malfunction in the right front/passenger side impact sensor, which may be due to wiring issues, sensor damage, or a faulty connection.

3. How can I diagnose the OBDII code B0078 in my Hummer?

- Diagnosis involves using an OBDII scanner to retrieve the specific error code, inspecting the right front/passenger side impact sensor and its wiring for damage, and checking for loose connections.

4. Can I continue driving my Hummer with the OBDII code B0078?

- It is not recommended to drive the vehicle with the B0078 code present, as it indicates a potential issue with the airbag system's right front/passenger side impact sensor, which could affect the airbag's performance in a collision.

5. What is the repair process for OBDII code B0078 in a Hummer?

- The repair process may involve replacing the right front/passenger side impact sensor, repairing damaged wiring, or securing any loose connections to ensure proper sensor performance and clear the error code.

6. Are there any DIY tips for fixing the OBDII code B0078 in a Hummer?

- DIY tips include carefully inspecting the impact sensor and its wiring for visible damage, ensuring all connections are secure, and following the vehicle's service manual for specific repair procedures.

7. How much does it typically cost to repair the OBDII code B0078 in a Hummer?

- The cost of repairing the B0078 code can vary depending on the extent of the damage, parts needed for replacement, and labor costs, so it's recommended to obtain estimates from reputable mechanics or dealerships.

8. Can a faulty right front/passenger side impact sensor cause other issues besides triggering the B0078 code?

- Yes, a malfunctioning impact sensor can potentially affect the overall performance of the airbag system, compromising passenger safety in the event of a collision.

9. How long does it take to repair the OBDII code B0078 in a Hummer?

- The repair time can vary based on the extent of the issue and the availability of parts, but it typically takes a few hours to a day to diagnose, repair, and clear the B0078 code.

10. Is it important to address the OBDII code B0078 immediately in a Hummer?

- Yes, it is crucial to address the B0078 code promptly to ensure the proper functioning of the airbag system and maintain passenger safety in the vehicle.