B1159 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
- B1159 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 B1159 Buick Description
What are the Possible Causes of the DTC B1159 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 B1159 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 B1159 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 B1159 Buick Code
1. What does the OBDII code B1159 mean in a Buick?
The B1159 code indicates a "SDM Calibration Mismatch," meaning the Supplemental Inflatable Restraint (SIR) system's calibration doesn't match the vehicle's configuration or the SDM module's programming.
2. What are the common symptoms of code B1159 in a Buick?
Symptoms may include the airbag warning light staying on, a stored trouble code, and potentially disabled airbag functionality.
3. What causes the B1159 code to appear in a Buick?
Common causes include an incorrectly programmed SDM module, a replacement SDM module that doesn't match the vehicle's configuration, or software corruption in the SDM.
4. Can I drive my Buick with the B1159 code active?
While the vehicle may still drive normally, the airbag system might not function correctly, increasing the risk of injury in an accident. It’s important to address this issue promptly.
5. How do I diagnose the B1159 code in my Buick?
Diagnosis typically involves using a scan tool to check for related codes, verifying the SDM calibration, and ensuring the module matches the vehicle's configuration.
6. What repairs can fix the B1159 code on a Buick?
Repairs may include reprogramming the SDM module with the correct calibration, replacing a faulty SDM module, or addressing any software issues.
7. How much does it cost to fix code B1159 on a Buick?
Repair costs vary depending on the specific issue, but reprogramming or replacing the SDM module typically costs between $150 and $500, depending on labor and parts.
8. Can a B1159 code be caused by a dead battery or power loss?
Yes, a dead battery or power loss during system programming could corrupt the SDM calibration, triggering the B1159 code.
9. Do I need special tools to fix the B1159 code in a Buick?
Yes, resolving this issue usually requires a professional scan tool capable of accessing the airbag system and reprogramming the SDM module.
10. Is the B1159 code covered under warranty for my Buick?
It depends on your vehicle's warranty and age. If the SDM module is faulty and the vehicle is under warranty, the repair may be covered. Check with your dealership for specifics.
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