AutoCodes – Cadillac – B0077 Cadillac

B0077 Cadillac 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 Cadillac 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,492

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

What does this mean?

What are the Possible Causes of the DTC B0077 Cadillac?

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 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 B0077 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.

Need more information about the B0077 Cadillac code?

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

Need Help with the Code?

Get the B0077 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 B0077 Cadillac Code

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

- Common symptoms include the airbag warning light staying on, erratic behavior of the airbag system, and potential non-deployment of the airbags during a collision.

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

- The code B0077 typically indicates a malfunction or poor performance of the left front/driver side impact sensor, which could be caused by wiring issues, sensor damage, or faulty connections.

3. How can I diagnose the OBDII code B0077 related to the Left Front/Driver Side Impact Sensor Performance in my Cadillac?

- Diagnosing this code usually involves inspecting the impact sensor and its wiring for damage, testing the sensor's performance with a multimeter, and checking for any loose connections or corrosion.

4. Can I still drive my Cadillac safely with the OBDII code B0077 indicating an issue with the Left Front/Driver Side Impact Sensor Performance?

- It is not recommended to drive the vehicle with an unresolved airbag system issue, as this can compromise the safety of the driver and passengers in the event of a collision. Immediate attention and repair are advised.

5. How can I reset the OBDII code B0077 in my Cadillac after fixing the issue with the Left Front/Driver Side Impact Sensor Performance?

- Once the issue with the impact sensor has been resolved, you can reset the OBDII code B0077 using an OBDII scanner or by disconnecting the car battery for a few minutes to clear the error code.

6. Are there any DIY repair tips for addressing the OBDII code B0077 in a Cadillac related to the Left Front/Driver Side Impact Sensor Performance?

- DIY repair tips may include checking and securing the wiring connections, inspecting the sensor for physical damage, and performing basic continuity tests to identify any faults.

7. Is it safe to attempt repairing the Left Front/Driver Side Impact Sensor on my Cadillac myself?

- While some basic checks and repairs can be done by DIY enthusiasts, it is recommended to consult a professional mechanic or technician for accurate diagnosis and repair of the impact sensor to ensure proper airbag system functionality.

8. How much does it typically cost to repair the Left Front/Driver Side Impact Sensor related to the OBDII code B0077 in a Cadillac?

- The cost of repairing the impact sensor can vary depending on the extent of the damage, parts needed for replacement, and labor costs. It is advisable to obtain estimates from reputable auto repair shops.

9. Can a faulty Left Front/Driver Side Impact Sensor impact the overall safety of my Cadillac's airbag system?

- Yes, a malfunctioning impact sensor can affect the proper deployment of the airbags in a collision, compromising the vehicle's safety features. It is crucial to address and repair this issue promptly.

10. How often should the Left Front/Driver Side Impact Sensor be inspected or replaced in a Cadillac to prevent issues like OBDII code B0077?

- Regular inspections of the impact sensor during routine maintenance checks can help prevent issues like code B0077. If any signs of damage or malfunction are noticed, the sensor should be promptly repaired or replaced.