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B1159 Buick Code - SDM Calibration Mismatch

Quick Answer

The B1159 Buick code indicates a SDM (Sensing and Diagnostic Module) Calibration Mismatch. Common causes include Software glitch in the SDM module, Faulty SDM module, Electrical issues affecting communication with 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
B1159 Buick indicates SDM Calibration Mismatch.
Common causes
Common causes include Software glitch in the SDM module, Faulty SDM module, Electrical issues affecting communication with 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 B1159 Buick Description

The B1159 Buick 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 the airbags if necessary. When the calibration of the SDM does not match the specifications required by the vehicle manufacturer, it can lead to potential issues with the airbag system's functionality.

OBDII Code B1159 Buick - SDM Calibration Mismatch
B1159 Buick Code - SDM Calibration Mismatch

Common Causes of B1159 Buick

  1. Software glitch in the SDM module
  2. Faulty SDM module
  3. Electrical issues affecting communication with the SDM
  4. Incorrect installation of aftermarket accessories impacting the SDM calibration
  5. Vehicle involved in a collision that may have affected the SDM calibration

Symptoms of B1159 Buick

  1. Airbag warning light illuminated on the dashboard
  2. Inconsistent or erratic airbag deployment
  3. Fault codes related to the airbag system
  4. Loss of communication with the SDM module
  5. Vehicle failing safety inspections due to airbag system issues

How to Fix B1159 Buick

  1. Diagnose the SDM Calibration Mismatch using a diagnostic scan tool to verify the fault code and pinpoint the issue.
  2. Check for any software updates or recalibrations provided by the manufacturer for the SDM module.
  3. If no software updates are available, the SDM module may need to be replaced with a new one to ensure proper calibration.
  4. Clear the fault codes from the system and perform a reset to ensure the airbag system is functioning correctly.
  5. Test the airbag system by simulating a collision to verify proper deployment and functionality.

Cost to Fix B1159 Buick

The cost of repairing a SDM Calibration Mismatch can vary depending on the extent of the issue and the specific vehicle make and model. On average, the repair costs for this issue can range from $200 to $500, including parts and labor. However, it is important to note that the actual cost may differ based on the location of the repair shop, the hourly labor rates, and any additional diagnostics or repairs required. It's recommended to consult with a professional mechanic to get an accurate estimate for addressing the SDM Calibration Mismatch in your vehicle.

What does this mean?

Tech Notes for B1159 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 B1159 Buick code?

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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 Buick Code

1. What does the OBDII code B1159 mean in a Buick?

The B1159 code indicates a "SDM Calibration Mismatch," meaning the Supplemental Inflatable Restraint (SIR) system's calibration doesn't match the vehicle's configuration or the SDM module's programming.

2. What are the common symptoms of code B1159 in a Buick?

Symptoms may include the airbag warning light staying on, a stored trouble code, and potentially disabled airbag functionality.

3. What causes the B1159 code to appear in a Buick?

Common causes include an incorrectly programmed SDM module, a replacement SDM module that doesn't match the vehicle's configuration, or software corruption in the SDM.

4. Can I drive my Buick with the B1159 code active?

While the vehicle may still drive normally, the airbag system might not function correctly, increasing the risk of injury in an accident. It’s important to address this issue promptly.

5. How do I diagnose the B1159 code in my Buick?

Diagnosis typically involves using a scan tool to check for related codes, verifying the SDM calibration, and ensuring the module matches the vehicle's configuration.

6. What repairs can fix the B1159 code on a Buick?

Repairs may include reprogramming the SDM module with the correct calibration, replacing a faulty SDM module, or addressing any software issues.

7. How much does it cost to fix code B1159 on a Buick?

Repair costs vary depending on the specific issue, but reprogramming or replacing the SDM module typically costs between $150 and $500, depending on labor and parts.

8. Can a B1159 code be caused by a dead battery or power loss?

Yes, a dead battery or power loss during system programming could corrupt the SDM calibration, triggering the B1159 code.

9. Do I need special tools to fix the B1159 code in a Buick?

Yes, resolving this issue usually requires a professional scan tool capable of accessing the airbag system and reprogramming the SDM module.

10. Is the B1159 code covered under warranty for my Buick?

It depends on your vehicle's warranty and age. If the SDM module is faulty and the vehicle is under warranty, the repair may be covered. Check with your dealership for specifics.

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