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B1155 Cadillac Code - SDM Calibration Mismatch

Quick Answer

The B1155 code for Cadillac vehicles indicates a SDM (Sensing and Diagnostic Module) Calibration Mismatch. Common causes include Faulty SDM sensor, Incorrect calibration values entered into the SDM, Electrical issues affecting 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
B1155 Cadillac indicates SDM Calibration Mismatch.
Common causes
Common causes include Faulty SDM sensor, Incorrect calibration values entered into the SDM, Electrical issues affecting 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 13, 2024
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Code B1155 Cadillac Description

The B1155 code for Cadillac vehicles 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 when necessary. When the calibration of the SDM does not match the expected values, it can lead to potential issues with the airbag system's functionality.

OBDII Code B1155 Cadillac - SDM Calibration Mismatch
B1155 Cadillac Code - SDM Calibration Mismatch

Common Causes of B1155 Cadillac

  1. Faulty SDM sensor
  2. Incorrect calibration values entered into the SDM
  3. Electrical issues affecting the SDM
  4. Impact or damage to the SDM unit
  5. Software glitches or malfunctions in the SDM system

Symptoms of B1155 Cadillac

  1. Airbag warning light illuminated on the dashboard
  2. Inconsistent or erratic airbag deployment
  3. Fault codes related to the airbag system
  4. Increased risk of injury in a collision

How to Fix B1155 Cadillac

  1. Connect a diagnostic scanner to retrieve the specific fault codes and confirm the B1155 code for SDM Calibration Mismatch.
  2. Inspect the SDM unit for any visible damage or signs of malfunction.
  3. Check and correct the calibration values in the SDM to match the manufacturer's specifications.
  4. Clear the fault codes and reset the airbag system to ensure proper functionality.
  5. Test the airbag system to verify that the issue has been resolved and that the airbags deploy correctly in a controlled environment.

Cost to Fix B1155 Cadillac

The typical repair costs for addressing the B1155 code for SDM Calibration Mismatch can vary depending on the extent of the issue and the specific repairs needed. In general, the cost of parts for this repair can range from $200 to $500, with labor costs adding an additional $100 to $300. Overall, the total repair cost for this issue may fall within the range of $300 to $800. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for more accurate pricing information.

What does this mean?

Tech Notes for B1155 Cadillac

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 B1155 Cadillac 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 B1155 Cadillac Code

1. What is OBDII code B1155 for Cadillac?

The B1155 code indicates a SDM (Sensing and Diagnostic Module) calibration mismatch in a Cadillac vehicle.

2. What are the common symptoms of a SDM Calibration Mismatch error?

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

3. What can cause the B1155 code to appear in a Cadillac?

The B1155 code typically appears due to a mismatch between the calibration data stored in the SDM and the actual configuration of the vehicle's airbag system.

4. How serious is a SDM Calibration Mismatch error in a Cadillac?

A SDM Calibration Mismatch error should be taken seriously, as it may affect the proper functioning of the airbag system in the event of a collision.

5. How can I diagnose a SDM Calibration Mismatch issue in my Cadillac?

Diagnosing a SDM Calibration Mismatch issue typically requires a professional scan tool to retrieve the specific error code and investigate the airbag system.

6. Can I continue driving my Cadillac with the B1155 error code present?

It is not recommended to drive the vehicle with the B1155 code present, as it may compromise the effectiveness of the airbag system in case of an accident.

7. How can I repair a SDM Calibration Mismatch error in my Cadillac?

Repairing a B1155 code usually involves reprogramming or calibrating the SDM to match the vehicle's airbag system configuration.

8. Is it possible to reset the B1155 code in a Cadillac without professional help?

While it may be possible to clear the error code temporarily, it is crucial to address the underlying issue causing the SDM Calibration Mismatch for a long-term solution.

9. Can a DIY enthusiast fix a SDM Calibration Mismatch error in a Cadillac?

Due to the complexity and safety implications of the airbag system, it is recommended to seek professional help to diagnose and repair a SDM Calibration Mismatch error.

10. How much does it cost to repair a SDM Calibration Mismatch issue in a Cadillac?

The cost of repairing a B1155 code can vary depending on the extent of the issue, but it typically involves recalibrating the SDM, which may range from a few hundred to a thousand dollars.

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