AutoCodes – GMC – B0077 GMC

B0077 GMC 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 GMC 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 2,195

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

What does this mean?

What are the Possible Causes of the DTC B0077 GMC?

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 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 B0077 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 B0077 GMC code?

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

Need Help with the Code?

Get the B0077 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 B0077 GMC Code

1. What are the common symptoms of OBDII code B0077 GMC (Left Front/Driver Side Impact Sensor Performance)?

- Common symptoms include the airbag warning light on the dashboard, erratic airbag deployment, or the airbags not deploying in the event of a collision.

2. What are the possible causes of OBDII code B0077 GMC?

- The code B0077 indicates a fault with the left front/driver side impact sensor, which could be caused by a damaged sensor, wiring issues, or a malfunction in the airbag control module.

3. How can I diagnose the issue related to OBDII code B0077 GMC?

- Diagnosis typically involves using a scan tool to read the fault codes, inspecting the left front impact sensor and its wiring for damage, and testing the sensor's performance according to manufacturer specifications.

4. Can I drive my vehicle with OBDII code B0077 GMC present?

- It is not recommended to drive the vehicle with this code present, as it indicates a potential issue with the airbag system, compromising passenger safety in the event of a collision.

5. How can I repair OBDII code B0077 GMC (Left Front/Driver Side Impact Sensor Performance)?

- Repairing the issue may involve replacing the left front impact sensor, repairing or replacing damaged wiring, or reprogramming the airbag control module. It is recommended to consult a professional mechanic for proper diagnosis and repair.

6. Are there any DIY tips for troubleshooting OBDII code B0077 GMC?

- While basic inspections like checking for loose connections or visible damage can be done by DIY enthusiasts, troubleshooting and repairing the issue related to this code may require advanced knowledge and specialized tools.

7. How much does it typically cost to repair OBDII code B0077 GMC?

- The cost of repairing OBDII code B0077 GMC can vary depending on the cause of the issue, the labor rates in your area, and the cost of parts needed for the repair. It is advisable to obtain quotes from different mechanics for an accurate estimate.

8. Can resetting the OBDII system clear the B0077 GMC code?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing the B0077 code is not addressed, the code is likely to reappear. It's essential to diagnose and repair the root cause of the problem.

9. How often does OBDII code B0077 GMC occur in GMC vehicles?

- The B0077 GMC code related to the left front/driver side impact sensor performance is a relatively uncommon code, but it can occur in various GMC models equipped with an airbag system.

10. Is it safe to ignore OBDII code B0077 GMC if the airbags seem to be functioning normally?

- It is not safe to ignore the B0077 GMC code, even if the airbags appear to be functioning correctly. The code indicates a potential issue with the impact sensor, which can affect the airbag deployment in the event of a collision.