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Engine-Codes – GMC – B1155 GMC

B1155 GMC Code - SDM Calibration Mismatch

Quick Answer

The B1155 GMC code indicates a SDM (Sensing and Diagnostic Module) Calibration Mismatch. Common causes include Electrical faults in the wiring harness or connectors, Sensor malfunctions or damage, Software glitches in the SDM. 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 GMC indicates SDM Calibration Mismatch.
Common causes
Common causes include Electrical faults in the wiring harness or connectors, Sensor malfunctions or damage, Software glitches in the SDM.
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 10, 2024
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Code B1155 GMC Description

The B1155 GMC code indicates a SDM (Sensing and Diagnostic Module) Calibration Mismatch. The SDM is a crucial component of the vehicle's airbag system, responsible for monitoring various sensors and deploying the airbags in the event of a collision. When the SDM Calibration Mismatch occurs, it means that there is a discrepancy between the calibration data stored in the SDM and the expected values, which could potentially lead to improper airbag deployment or failure to deploy in a crash.

OBDII Code B1155 GMC - SDM Calibration Mismatch
B1155 GMC Code - SDM Calibration Mismatch

Common Causes of B1155 GMC

  1. Electrical faults in the wiring harness or connectors.
  2. Sensor malfunctions or damage.
  3. Software glitches in the SDM.
  4. SDM calibration data corruption.
  5. Physical damage to the SDM unit.

Symptoms of B1155 GMC

  1. Illumination of the airbag warning light on the dashboard.
  2. Erratic airbag deployment or failure to deploy in a crash.
  3. Inconsistent or inaccurate readings from airbag sensors.
  4. Diagnostic trouble codes related to the airbag system.

How to Fix B1155 GMC

  1. Diagnose the root cause of the calibration mismatch using a professional diagnostic tool.
  2. Inspect the wiring harness and connectors for any signs of damage or corrosion, repairing or replacing as necessary.
  3. Check and test the airbag sensors to ensure they are functioning correctly.
  4. Update or reprogram the SDM software to correct any calibration discrepancies.
  5. If the SDM unit is found to be faulty, replace it with a new or refurbished unit.

Cost to Fix B1155 GMC

The typical repair costs for addressing a B1155 GMC code can range from $200 to $500, depending on the specific cause of the calibration mismatch and the extent of the repairs needed. This estimate includes parts and labor, but actual costs may vary based on factors such as the location of the repair shop, the vehicle's make and model, and the type of engine. It's advisable to consult with a professional mechanic for a more accurate cost estimate tailored to your specific circumstances.

What does this mean?

Tech Notes for B1155 GMC

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 GMC code?

Need more information on how to fix the B1155 GMC 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 GMC Code

1. What is OBDII code B1155 GMC?

The B1155 GMC code refers to an SDM (Sensing and Diagnostic Module) Calibration Mismatch error.

2. What are common symptoms of B1155 GMC code?

Common symptoms of B1155 GMC code include the airbag warning light illuminating on the dashboard and potential issues with the vehicle's airbag system.

3. What can cause the B1155 GMC code to trigger?

The B1155 GMC code is triggered when there is a discrepancy between the calibration data in the SDM and other modules in the vehicle, often due to a previous repair or replacement of components in the airbag system.

4. How serious is the B1155 GMC code?

The B1155 GMC code is a serious issue as it relates to the proper functioning of the airbag system. It is important to address this code promptly to ensure the safety features of the vehicle are working correctly.

5. How can I diagnose the B1155 GMC code?

Diagnosing the B1155 GMC code typically requires a professional scan tool to communicate with the SDM and other modules in the vehicle to identify the calibration mismatch.

6. Can I repair the B1155 GMC code on my own?

Repairing the B1155 GMC code often requires specialized knowledge and tools. It is recommended to have a qualified technician diagnose and repair this issue to ensure proper functioning of the airbag system.

7. What are some possible repair tips for the B1155 GMC code?

Repairing the B1155 GMC code may involve recalibrating the SDM, updating software, or replacing faulty components in the airbag system. It is crucial to follow manufacturer guidelines for proper repair procedures.

8. Is it safe to drive with the B1155 GMC code present?

It is not recommended to drive with the B1155 GMC code present, as it indicates a potential issue with the airbag system. Driving with this code can compromise the safety of the vehicle occupants in the event of a collision.

9. How much does it typically cost to repair the B1155 GMC code?

The cost of repairing the B1155 GMC code can vary depending on the underlying cause and the necessary repairs. It is advisable to consult with a professional technician for an accurate estimate.

10. Can the B1155 GMC code be cleared without fixing the underlying issue?

Clearing the B1155 GMC code without addressing the calibration mismatch can temporarily turn off the warning light, but the issue will likely reoccur. It is essential to address the root cause of the problem to ensure the airbag system functions properly.

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