B1155 Buick 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
- B1155 Buick 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.
Code B1155 Buick Description
What are the Possible Causes of the DTC B1155 Buick?
- 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 B1155 Buick?
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.
Code Tech Notes
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 B1155 Buick 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.
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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.
Frequently Asked Questions about B1155 Buick Code
1. What are the common symptoms of OBDII code B1155 Buick (SDM Calibration Mismatch)?
The common symptoms include the airbag warning light illuminating on the dashboard and potential issues with the vehicle's airbag system.
2. What causes the OBDII code B1155 Buick (SDM Calibration Mismatch) to trigger?
This code is typically triggered when there is a mismatch detected between the calibration of the Sensing and Diagnostic Module (SDM) and other related components in the airbag system.
3. How serious is the OBDII code B1155 Buick (SDM Calibration Mismatch)?
This code indicates a potential issue with the airbag system, which is a crucial safety feature in the vehicle. It is important to address this issue promptly to ensure the airbags function correctly in case of an accident.
4. Can I continue driving my Buick with the OBDII code B1155 (SDM Calibration Mismatch)?
It is not recommended to drive the vehicle with an active airbag system fault code. Continued driving may compromise the proper functioning of the airbags in case of a collision.
5. How can I diagnose and repair OBDII code B1155 Buick (SDM Calibration Mismatch)?
Diagnosing this code usually involves using a professional OBDII scanner to read the specific fault codes and then performing tests to identify the root cause, which may involve recalibrating the SDM or replacing faulty components.
6. Are there any DIY repair tips for OBDII code B1155 Buick (SDM Calibration Mismatch)?
While diagnosing and repairing this code may require specialized tools and expertise, some DIY enthusiasts may attempt to address the issue by carefully following the manufacturer's repair instructions or seeking assistance from a qualified mechanic.
7. How much does it cost to fix OBDII code B1155 Buick (SDM Calibration Mismatch)?
The cost of fixing this issue can vary depending on the exact cause of the problem, the labor rates in your area, and whether any components need replacement. It's best to get a diagnostic assessment from a trusted mechanic for an accurate cost estimate.
8. Can resetting the OBDII code B1155 Buick (SDM Calibration Mismatch) resolve the issue?
Simply resetting the fault code may temporarily turn off the warning light, but it will not address the underlying problem causing the SDM Calibration Mismatch. It's essential to diagnose and fix the root cause to ensure the airbag system functions properly.
9. Is it safe to ignore the OBDII code B1155 Buick (SDM Calibration Mismatch)?
Ignoring this fault code can pose a risk as it indicates a potential issue with the airbag system. For your safety and that of passengers, it is recommended to address the problem promptly.
10. How long does it typically take to repair OBDII code B1155 Buick (SDM Calibration Mismatch)?
The repair time for this code can vary depending on the complexity of the issue and the availability of parts. Simple recalibrations may take less time, while component replacements or more extensive repairs may require more time.
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