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B1155 Chevrolet Code - SDM Calibration Mismatch

Quick Answer

The B1155 Chevrolet code indicates a SDM (Sensing and Diagnostic Module) Calibration Mismatch. Common causes include Software glitch in the SDM, Faulty crash sensor, Wiring issues in the airbag system. 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 Chevrolet indicates SDM Calibration Mismatch.
Common causes
Common causes include Software glitch in the SDM, Faulty crash sensor, Wiring issues in the airbag system.
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 B1155 Chevrolet Description

The B1155 Chevrolet code indicates a SDM (Sensing and Diagnostic Module) Calibration Mismatch. The SDM is an important component of the vehicle's airbag system, responsible for detecting collisions and deploying the airbags when necessary. When this code appears, it means that there is a discrepancy between the calibration data stored in the SDM and the actual requirements of the vehicle. This could be due to various reasons such as a software glitch, a faulty sensor, or a wiring issue.

OBDII Code B1155 Chevrolet - SDM Calibration Mismatch
B1155 Chevrolet Code - SDM Calibration Mismatch

Common Causes of B1155 Chevrolet

  1. Software glitch in the SDM
  2. Faulty crash sensor
  3. Wiring issues in the airbag system
  4. Water damage to the SDM unit
  5. Impact or collision that caused damage to the airbag system

Symptoms of B1155 Chevrolet

  1. Airbag warning light illuminated on the dashboard
  2. Message on the driver information center indicating an airbag system fault
  3. Inoperative airbags or seat belt pretensioners
  4. Vehicle failing to pass a state inspection due to airbag system malfunction

How to Fix B1155 Chevrolet

  1. Retrieve the specific diagnostic trouble code using a OBD-II scanner to confirm the issue is related to the SDM Calibration Mismatch.
  2. Inspect the wiring harness and connections for any damage or corrosion. Repair or replace as necessary.
  3. Reset the SDM by disconnecting the battery for at least 30 minutes to clear any stored codes.
  4. If the issue persists, perform a recalibration of the SDM using a diagnostic scan tool.
  5. If recalibration does not resolve the issue, consider replacing the SDM unit with a new one.

Cost to Fix B1155 Chevrolet

The cost of repairing a B1155 Chevrolet code can vary depending on the specific cause of the issue and the extent of the repair needed. On average, the cost of replacing a faulty SDM unit can range from $500 to $1000, including parts and labor. However, additional costs may apply if there are other components that need to be replaced or if extensive diagnostic work is required. It's important to consult with a professional mechanic to get an accurate estimate for your specific vehicle. Keep in mind that labor rates can vary between different auto repair shops and locations.

What does this mean?

Tech Notes for B1155 Chevrolet

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 Chevrolet 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 Chevrolet Code

1. What does the OBDII code B1155 mean on a Chevrolet?

B1155 indicates a "SDM Calibration Mismatch," meaning the Supplemental Restraint System (SRS) control module's programming does not match the vehicle's configuration.

2. What are the common symptoms of the B1155 code on a Chevrolet?

Common symptoms include the airbag warning light staying on, a stored trouble code, and potential issues with the airbag system functionality.

3. What causes the B1155 code to appear in a Chevrolet?

This code is typically caused by incorrect programming or calibration of the SRS module, installation of an incompatible module, or a recent module replacement without proper setup.

4. Is the B1155 code a serious issue in a Chevrolet?

Yes, it can be serious because it may indicate that the airbag system is not functioning correctly, potentially compromising passenger safety in an accident.

5. How do I fix the B1155 code on my Chevrolet?

The fix usually involves reprogramming or recalibrating the SRS module using a compatible scan tool. In some cases, replacing the module with the correct part may be necessary.

6. Can I drive my Chevrolet with the B1155 code active?

While the vehicle may still be drivable, it is not recommended as the airbag system may not deploy properly in the event of a collision.

7. What tools are needed to diagnose and repair the B1155 code?

A professional-grade diagnostic scan tool capable of accessing the SRS system is required to diagnose and perform calibration or reprogramming.

8. Can a dead or disconnected battery cause the B1155 code in a Chevrolet?

Yes, a loss of power or improper reconnection of the battery can sometimes cause the SRS module to lose its calibration.

9. Will clearing the B1155 code turn off the airbag warning light in a Chevrolet?

Clearing the code will turn off the light temporarily, but if the underlying issue is not resolved, the code and warning light will return.

10. How much does it cost to fix the B1155 code on a Chevrolet?

The cost depends on the repair required. Reprogramming the SRS module typically costs $100–$300, while replacing the module could cost $500–$1,000 or more, including labor.

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