B1155 Cadillac 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 Cadillac 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 Cadillac Description
What are the Possible Causes of the DTC B1155 Cadillac?
- 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 Cadillac?
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 Cadillac 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 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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