AutoCodes – Hummer – B0077 Hummer

B0077 Hummer 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 Hummer 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 3,146

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

What does this mean?

What are the Possible Causes of the DTC B0077 Hummer?

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 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 B0077 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 B0077 Hummer code?

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

Need Help with the Code?

Get the B0077 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 B0077 Hummer Code

1. What are the common symptoms of OBDII code B0077 in a Hummer related to the Left Front/Driver Side Impact Sensor Performance?

The common symptoms include the airbag warning light illuminating on the dashboard and a potential malfunction of the driver side airbag system.

2. What are the possible causes of OBDII code B0077 in a Hummer?

The code B0077 usually indicates a problem with the left front/driver side impact sensor. This can be caused by sensor damage, wiring issues, or a faulty connection.

3. How can I diagnose the issue causing OBDII code B0077 in my Hummer?

To diagnose the issue, you can use a diagnostic scanner to read the specific error codes. Additionally, you can visually inspect the impact sensor and its wiring for any signs of damage.

4. What repairs are typically needed to fix OBDII code B0077 in a Hummer?

Common repairs include replacing the left front/driver side impact sensor, repairing damaged wiring, or fixing any loose connections related to the sensor.

5. Can I drive my Hummer with OBDII code B0077 present?

It is not recommended to drive the vehicle with OBDII code B0077 present, as it indicates a potential issue with the driver side airbag system, which may affect its functionality in the event of an accident.

6. How much does it cost to repair OBDII code B0077 in a Hummer?

The cost of repairing OBDII code B0077 can vary depending on the exact cause of the issue, but it typically ranges from $100 to $300 for parts and labor.

7. Are there any safety concerns associated with OBDII code B0077 in a Hummer?

Yes, there are safety concerns associated with this code, as it indicates a potential problem with the driver side airbag system, which may not deploy properly in the event of a collision.

8. Can I reset OBDII code B0077 in my Hummer without fixing the underlying issue?

While you can clear the error code using a diagnostic scanner, it is not recommended to do so without addressing the root cause, as the problem may persist and compromise safety.

9. How can I prevent OBDII code B0077 from appearing in my Hummer in the future?

Regular maintenance checks, including inspecting the impact sensor and related wiring, can help prevent OBDII code B0077 from appearing due to issues with the left front/driver side impact sensor.

10. Is it necessary to visit a professional mechanic to diagnose and repair OBDII code B0077 in a Hummer?

It is recommended to consult a professional mechanic with experience in diagnosing and repairing airbag system issues to properly address OBDII code B0077 related to the left front/driver side impact sensor performance.