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B1155 Buick Code - SDM Calibration Mismatch

Quick Answer

The B1155 Buick code refers to an issue with the Sensing and Diagnostic Module (SDM) calibration mismatch. Common causes include Software glitch in the SDM, Faulty sensor or wiring connection, Recent repair or replacement of components affecting calibration. 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
B1155 Buick indicates SDM Calibration Mismatch.
Common causes
Common causes include Software glitch in the SDM, Faulty sensor or wiring connection, Recent repair or replacement of components affecting calibration.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 16, 2024
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Code B1155 Buick Description

The B1155 Buick code refers to an issue with the Sensing and Diagnostic Module (SDM) calibration mismatch. The SDM is a crucial component of the vehicle's safety system, responsible for deploying airbags and seat belt pretensioners in the event of a collision. When the calibration of the SDM does not match the expected values, it can lead to malfunctions in the deployment of these safety features, compromising the vehicle's ability to protect occupants in the event of an accident.

OBDII Code B1155 Buick - SDM Calibration Mismatch
B1155 Buick Code - SDM Calibration Mismatch

Common Causes of B1155 Buick

  1. Software glitch in the SDM
  2. Faulty sensor or wiring connection
  3. Recent repair or replacement of components affecting calibration
  4. Water damage or corrosion in the SDM module
  5. Electrical issues in the vehicle's wiring system

Symptoms of B1155 Buick

  1. Illumination of the airbag warning light on the dashboard
  2. Inconsistent or delayed deployment of airbags in a crash
  3. Intermittent issues with seat belt pretensioners
  4. Diagnostic trouble codes related to the SDM calibration mismatch

How to Fix B1155 Buick

  1. Use a diagnostic scan tool to retrieve the specific trouble codes and identify the source of the calibration mismatch.
  2. Inspect the SDM module, sensors, and wiring connections for any signs of damage or corrosion.
  3. Reset the SDM calibration using a specialized tool or software to match the correct values.
  4. Clear the trouble codes and perform a test drive to ensure that the airbags and seat belt pretensioners deploy correctly.
  5. If the issue persists, consider replacing the SDM module or any faulty sensors or wiring connections to resolve the problem.

Cost to Fix B1155 Buick

The typical repair costs for addressing a B1155 Buick code can vary depending on the specific cause of the calibration mismatch and the extent of repairs needed. In general, the cost of parts for replacing sensors or the SDM module can range from $200 to $800, while labor costs can add an additional $100 to $300 to the total repair bill. Overall, the total cost of resolving this issue may range from $300 to $1100, but it is advisable to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on the vehicle's make and model, as well as the local labor rates.

What does this mean?

Tech Notes for B1155 Buick

If DTCs B1155, B1159, and B1160 are all set, the Sensing and Diagnostic Module (SDM) is receiving both incorrect messages.

If DTCs B1155 and B1159 are set, SDM is receiving the wrong message from Standard Body Module (SBM).

If DTCs B1155 and B1160 are set, SDM is receiving the wrong message from Powertrain Control Module (PCM).

If DTC B1159 sets alone, SDM did not receive a message from SBM.

If DTC B1160 sets alone, SDM did not receive a message from PCM.

If DTCs B1159 and B1160 are set without DTC B1155, SDM did not receive messages from SBM or PCM.

Need more information about the B1155 Buick code?

Need more information on how to fix the B1155 Buick code? Get Access to Factory Service Manuals

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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 B1155 Buick Code

1. What are the common symptoms of OBDII code B1155 Buick (SDM Calibration Mismatch)?

The common symptoms include the airbag warning light illuminating on the dashboard and potential issues with the vehicle's airbag system.

2. What causes the OBDII code B1155 Buick (SDM Calibration Mismatch) to trigger?

This code is typically triggered when there is a mismatch detected between the calibration of the Sensing and Diagnostic Module (SDM) and other related components in the airbag system.

3. How serious is the OBDII code B1155 Buick (SDM Calibration Mismatch)?

This code indicates a potential issue with the airbag system, which is a crucial safety feature in the vehicle. It is important to address this issue promptly to ensure the airbags function correctly in case of an accident.

4. Can I continue driving my Buick with the OBDII code B1155 (SDM Calibration Mismatch)?

It is not recommended to drive the vehicle with an active airbag system fault code. Continued driving may compromise the proper functioning of the airbags in case of a collision.

5. How can I diagnose and repair OBDII code B1155 Buick (SDM Calibration Mismatch)?

Diagnosing this code usually involves using a professional OBDII scanner to read the specific fault codes and then performing tests to identify the root cause, which may involve recalibrating the SDM or replacing faulty components.

6. Are there any DIY repair tips for OBDII code B1155 Buick (SDM Calibration Mismatch)?

While diagnosing and repairing this code may require specialized tools and expertise, some DIY enthusiasts may attempt to address the issue by carefully following the manufacturer's repair instructions or seeking assistance from a qualified mechanic.

7. How much does it cost to fix OBDII code B1155 Buick (SDM Calibration Mismatch)?

The cost of fixing this issue can vary depending on the exact cause of the problem, the labor rates in your area, and whether any components need replacement. It's best to get a diagnostic assessment from a trusted mechanic for an accurate cost estimate.

8. Can resetting the OBDII code B1155 Buick (SDM Calibration Mismatch) resolve the issue?

Simply resetting the fault code may temporarily turn off the warning light, but it will not address the underlying problem causing the SDM Calibration Mismatch. It's essential to diagnose and fix the root cause to ensure the airbag system functions properly.

9. Is it safe to ignore the OBDII code B1155 Buick (SDM Calibration Mismatch)?

Ignoring this fault code can pose a risk as it indicates a potential issue with the airbag system. For your safety and that of passengers, it is recommended to address the problem promptly.

10. How long does it typically take to repair OBDII code B1155 Buick (SDM Calibration Mismatch)?

The repair time for this code can vary depending on the complexity of the issue and the availability of parts. Simple recalibrations may take less time, while component replacements or more extensive repairs may require more time.

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