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Engine-Codes – GMC – B1159 GMC

B1159 GMC Code - SDM Calibration Mismatch

Quick Answer

The B1159 GMC code indicates a SDM (Sensing and Diagnostic Module) Calibration Mismatch. Common causes include Faulty sensor sending incorrect data to the SDM, Wiring issues causing a communication error between sensors and SDM, Software glitch in the SDM calibration data. 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
B1159 GMC indicates SDM Calibration Mismatch.
Common causes
Common causes include Faulty sensor sending incorrect data to the SDM, Wiring issues causing a communication error between sensors and SDM, Software glitch in the SDM calibration data.
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 12, 2024
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Code B1159 GMC Description

The B1159 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 detecting collisions and deploying airbags in the event of an accident. When this code appears, it means that there is a discrepancy between the calibration data stored in the SDM and the actual calibration of the vehicle's sensors.

OBDII Code B1159 GMC - SDM Calibration Mismatch
B1159 GMC Code - SDM Calibration Mismatch

Common Causes of B1159 GMC

  1. Faulty sensor sending incorrect data to the SDM
  2. Wiring issues causing a communication error between sensors and SDM
  3. Software glitch in the SDM calibration data
  4. Previous collision or accident causing damage to sensors or SDM

Symptoms of B1159 GMC

  1. Airbag warning light illuminated on the dashboard
  2. Airbags not deploying in a collision
  3. Inconsistent or erratic behavior of other safety systems
  4. Diagnostic trouble codes related to the SDM calibration mismatch

How to Fix B1159 GMC

  1. Use a diagnostic scanner to retrieve the specific fault code and identify the source of the calibration mismatch.
  2. Inspect all sensors related to the airbag system to check for any damage or malfunction.
  3. Check the wiring harness for any signs of damage or corrosion that could be affecting sensor communication.
  4. Reset the SDM calibration data and perform a recalibration of the system to ensure accuracy.
  5. Clear the fault code and test the vehicle to confirm that the issue has been resolved.

Cost to Fix B1159 GMC

The cost of repairing a SDM Calibration Mismatch can vary depending on the specific cause of the issue and the extent of the repairs needed. On average, the repair costs for this type of issue can range from $200 to $600, including parts and labor. However, it's important to note that diagnostic time and labor rates at auto repair shops can vary widely. It's recommended to obtain quotes from multiple shops and compare prices before proceeding with the repair.

What does this mean?

Tech Notes for B1159 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 B1159 GMC code?

Need more information on how to fix the B1159 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 B1159 GMC Code

1. What is OBDII code B1159 GMC "SDM Calibration Mismatch"?

The B1159 code indicates that there is a mismatch in calibration data between the sensing and diagnostic module (SDM) and other modules in the vehicle.

2. What are the common symptoms of OBDII code B1159 GMC?

Common symptoms of B1159 may include an illuminated airbag warning light on the dashboard, issues with the airbag system, or a message indicating an airbag system fault.

3. What are the possible causes of OBDII code B1159 GMC?

Possible causes of B1159 can include a faulty SDM, a software issue within the SDM or other modules, wiring problems, or a disconnected or damaged airbag system component.

4. How can I diagnose the OBDII code B1159 GMC?

Diagnosing B1159 typically requires using a professional OBDII scanner to retrieve the specific fault codes. Further diagnosis may involve inspecting the airbag system components, checking wiring connections, and verifying the SDM calibration data.

5. Can I continue driving with OBDII code B1159 GMC active?

It is not recommended to drive with the B1159 code active, as it indicates a potential issue with the airbag system that may affect its proper functionality in the event of a collision.

6. How can I repair OBDII code B1159 GMC "SDM Calibration Mismatch"?

Repairing B1159 may involve resetting the SDM calibration data, updating software in the modules, checking and repairing wiring connections, or replacing faulty components in the airbag system.

7. Is it safe to reset the OBDII code B1159 GMC on my own?

While you can attempt to clear the code with an OBDII scanner, it is essential to address the root cause of the issue to ensure the airbag system is functioning correctly. If you are unsure, it is best to seek professional assistance.

8. How much does it typically cost to repair OBDII code B1159 GMC?

The cost of repairing B1159 can vary depending on the underlying cause of the issue. It may range from a simple software update to more extensive repairs or component replacements, which can impact the overall cost.

9. Will OBDII code B1159 GMC cause my vehicle to fail an inspection?

If the airbag warning light is illuminated due to B1159, it may cause your vehicle to fail a safety inspection, as the airbag system is a critical safety component. It is essential to address the issue promptly.

10. Can OBDII code B1159 GMC be prevented?

While some causes of B1159 may be unavoidable, regular maintenance of the airbag system, checking for software updates, and addressing any warning lights promptly can help prevent issues related to the SDM calibration mismatch.

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