AutoCodes – GMC – B1159 GMC

B1159 GMC Code - SDM Calibration Mismatch

Quick Answer

When the ignition switch is turned to RUN position, Instrument Panel Cluster (IPC) sends two messages over the class 2 serial data line containing identification information. Common causes include Faulty Sensing and Diagnostic Module (SDM), Sensing and Diagnostic Module (SDM) harness is open or shorted, Sensing and Diagnostic Module (SDM) 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: B1159 GMC indicates SDM Calibration Mismatch.
Common causes: Common causes include Faulty Sensing and Diagnostic Module (SDM), Sensing and Diagnostic Module (SDM) harness is open or shorted, Sensing and Diagnostic Module (SDM) 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.

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Code Popularity 477

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 Nov 19, 2024

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B1159 GMC Description

When the ignition switch is turned to RUN position, Instrument Panel Cluster (IPC) sends two messages over the class 2 serial data line containing identification information. The first message contains serial data keying information, and the second message contains a partial Vehicle Identification Number (VIN). The Sensing and Diagnostic Module (SDM) compares these messages to the information stored in memory. The Diagnostic Trouble Code (DTC) B1155 sets when either message does not match information stored in SDM. DTC B1155 sets along with DTC B1159 or DTC B1160 depending on the message that does not match. If SDM does not receive the serial data keying message, DTC B1159 will be set without DTC B1155. If SDM does not receive a partial VIN message, DTC B1160 will be set without DTC B1155. Messages are sent only at POWER-ON.

OBDII Code B1159 GMC - SDM Calibration Mismatch - AutoCodes.com — B1159 GMC Code - SDM Calibration Mismatch

What does this mean?

What are the Possible Causes of the DTC B1159 GMC?

Faulty Sensing and Diagnostic Module (SDM)
Sensing and Diagnostic Module (SDM) harness is open or shorted
Sensing and Diagnostic Module (SDM) circuit poor electrical connection

How to Fix the DTC B1159 GMC?

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 does this mean?

Code Tech Notes

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1159 GMC 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 B1159 GMC code?

Need more information on how to fix the B1159 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1159 GMC 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 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.