B1155 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
- B1155 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.
Code B1155 Chevrolet Description
What are the Possible Causes of the DTC B1155 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 B1155 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.
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 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.
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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 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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