AutoCodes – Chevrolet – B1159 Chevrolet

B1159 Chevrolet 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 Chevrolet 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 521

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 Aug 03, 2021

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B1159 Chevrolet 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 Chevrolet - SDM Calibration Mismatch - AutoCodes.com — B1159 Chevrolet Code - SDM Calibration Mismatch

What does this mean?

What are the Possible Causes of the DTC B1159 Chevrolet?

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 Chevrolet?

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 Chevrolet 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 Chevrolet code?

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

Need Help with the Code?

Get the B1159 Chevrolet 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 Chevrolet Code

1. What are the common symptoms of OBDII code B1159 Chevrolet (SDM Calibration Mismatch)?

- Common symptoms include the airbag warning light staying illuminated on the dashboard and potential issues with the vehicle's airbag system.

2. What does the OBDII code B1159 Chevrolet (SDM Calibration Mismatch) indicate?

- This code indicates a mismatch between the calibration of the Sensing and Diagnostic Module (SDM) and the rest of the airbag system in the vehicle.

3. What are the possible causes of the SDM Calibration Mismatch (B1159) code?

- The code can be triggered by a disconnected, damaged, or faulty SDM, issues with the airbag sensors, wiring problems, or a recent collision that affected the airbag system.

4. Can driving with the B1159 Chevrolet code (SDM Calibration Mismatch) pose any risks?

- Driving with this code unresolved can pose a safety risk as the airbag system may not deploy correctly in the event of a collision.

5. How can I diagnose and repair the B1159 Chevrolet code (SDM Calibration Mismatch) issue?

- Diagnosing and repairing this code typically requires specialized diagnostic tools to pinpoint the exact cause, followed by repairing or replacing the faulty SDM or addressing any wiring issues.

6. Is it safe to reset the B1159 Chevrolet code (SDM Calibration Mismatch) without fixing the underlying issue?

- It is not recommended to simply reset the code without addressing the underlying problem, as this may compromise the functionality of the airbag system.

7. Are there any DIY tips for troubleshooting the B1159 Chevrolet code (SDM Calibration Mismatch)?

- DIY troubleshooting tips include checking the airbag system's connections, inspecting the SDM for any visible damage, and ensuring all wiring related to the airbag system is intact.

8. How can a professional mechanic help in resolving the B1159 Chevrolet code (SDM Calibration Mismatch)?

- A professional mechanic can conduct in-depth diagnostics using specialized tools, accurately identify the root cause of the issue, and perform the necessary repairs or replacements to fix the problem.

9. Can the B1159 Chevrolet code (SDM Calibration Mismatch) be intermittent or permanent?

- The code can sometimes be intermittent, especially if the issue is related to loose connections or intermittent faults, but it is crucial to address it promptly to ensure the airbag system's proper functioning.

10. Is it necessary to have the B1159 Chevrolet code (SDM Calibration Mismatch) fixed immediately?

- Yes, it is recommended to address this code promptly to ensure the proper functioning of the airbag system and maintain the safety of the vehicle occupants in the event of a collision.