AutoCodes – Buick – B0077 Buick

B0077 Buick Code - Left Front/Driver Side Impact Sensor Performance

Quick Answer

The Inflatable Restraint Side Impact Sensor (SIS) utilizes a unidirectional 2-wire circuit. Common causes include Faulty Left Front/Driver Side Impact Sensor (SIS), Left Front/Driver Side Impact Sensor (SIS) harness is open or shorted, Left Front/Driver 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: B0077 Buick indicates Left Front/Driver Side Impact Sensor Performance.
Common causes: Common causes include Faulty Left Front/Driver Side Impact Sensor (SIS), Left Front/Driver Side Impact Sensor (SIS) harness is open or shorted, Left Front/Driver 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 1,495

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 B0077 Buick 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 B0077 Buick - Left Front/Driver Side Impact Sensor Performance - AutoCodes.com — B0077 Buick Code - Left Front/Driver Side Impact Sensor Performance

What does this mean?

What are the Possible Causes of the DTC B0077 Buick?

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

How to Fix the DTC B0077 Buick?

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 B0077 Buick 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 B0077 Buick code?

Need more information on how to fix the B0077 Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0077 Buick 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 B0077 Buick Code

1. What are the common symptoms of OBDII code B0077 in a Buick related to the left front/driver side impact sensor?

- Common symptoms include the airbag warning light staying on, issues with the airbag system deployment, and potential diagnostic trouble codes (DTCs).

2. What are the possible causes triggering the OBDII code B0077 in a Buick's left front/driver side impact sensor?

- Causes may include a faulty impact sensor, damaged wiring or connectors, a malfunctioning airbag control module, or a problem with the vehicle's SRS system.

3. How can I diagnose the reason behind the OBDII code B0077 in a Buick for the left front/driver side impact sensor?

- Diagnosis involves using a scan tool to retrieve the specific DTC, inspecting the impact sensor and related components for damage, and testing the wiring and connectors for continuity.

4. What steps can I take to repair OBDII code B0077 in a Buick associated with the left front/driver side impact sensor?

- Repair may involve replacing the faulty impact sensor, repairing damaged wiring or connectors, resetting the airbag control module, or addressing any underlying issues in the SRS system.

5. Are there any safety precautions to consider when working on the left front/driver side impact sensor related to OBDII code B0077 in a Buick?

- It is crucial to disconnect the vehicle's battery before working on any airbag components to prevent accidental deployment and to follow proper safety procedures outlined in the vehicle's service manual.

6. Can I drive my Buick with OBDII code B0077 related to the left front/driver side impact sensor?

- It is not recommended to drive the vehicle with an unresolved airbag system issue as it may compromise the safety of the driver and passengers in the event of a collision.

7. How much does it typically cost to repair OBDII code B0077 in a Buick's left front/driver side impact sensor?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

8. Is it possible to reset or clear the OBDII code B0077 in a Buick without addressing the underlying issue with the left front/driver side impact sensor?

- Clearing the code without fixing the problem will only result in the code reappearing once the system detects the issue again. It is essential to diagnose and repair the root cause.

9. Can a DIY enthusiast with basic automotive knowledge fix OBDII code B0077 in a Buick's left front/driver side impact sensor?

- While some simple tasks like checking fuses or connectors may be performed by a DIYer, diagnosing and repairing airbag system issues often require specialized tools and expertise best handled by a professional technician.

10. How long does it typically take to repair OBDII code B0077 related to the left front/driver side impact sensor in a Buick?

- The repair time can vary based on the complexity of the issue and the availability of parts. It may take anywhere from a few hours to a full day for a skilled technician to diagnose and fix the problem.