B1103 Code - Communication Voltage Too Low
Quick Answer
When the ignition switch is turned to ON, the Sensing and Diagnostic Module (SDM) will perform turn-on test to diagnose critical malfunctions within SDM itself. Common causes include Faulty Sensing and Diagnostic Module (SDM), Sensing and Diagnostic Module harness is open or shorted, Sensing and Diagnostic Module 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
- B1103 indicates Communication Voltage Too Low.
- Common causes
- Common causes include Faulty Sensing and Diagnostic Module (SDM), Sensing and Diagnostic Module harness is open or shorted, Sensing and Diagnostic Module 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 B1103 Description
Upon passing these test ignition and deployment loop voltages are measured to ensure that they are within their normal voltage ranges. The SDM monitors the voltages at the driver low and the passenger low to detect shorts to ground or voltage in the deploy loops.
The SDM checks the wiring connection to each inflator by letting the infinitesimal current flow through the internal circuit and verify the resistance. But if the voltage is out of range, SDM is unable to check the airbag system properly.
What are the Possible Causes of the DTC B1103?
- Faulty Sensing and Diagnostic Module (SDM)
- Sensing and Diagnostic Module harness is open or shorted
- Sensing and Diagnostic Module circuit poor electrical connection
How to Fix the DTC B1103?
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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B1103 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.
Need more information about the B1103 code?
Need more information on how to fix the B1103 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the B1103 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- B1103 Buick — Communication Voltage Too Low
- B1103 Cadillac — Communication Voltage Too Low
- B1103 Chevrolet — Communication Voltage Too Low
- B1103 GMC — Communication Voltage Too Low
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 B1103 Code
1. What are the common symptoms of OBDII code B1103 (Communication Voltage Too Low)?
- Common symptoms include issues with communication between vehicle modules, malfunctioning dashboard warning lights, and potential difficulties in diagnosing other OBDII codes.
2. What can cause the OBDII code B1103 to trigger?
- The code B1103 may trigger due to a faulty wiring harness, loose connections, a malfunctioning communication module, or a low voltage supply to the communication network.
3. How can I diagnose the OBDII code B1103?
- Diagnosis involves using a professional OBDII scanner to retrieve the code, checking for any related codes, inspecting the wiring harness for damage, and testing the voltage supply to the communication network.
4. What are the possible repair options for OBDII code B1103?
- Repair options may include repairing or replacing damaged wiring harnesses, ensuring secure connections, replacing faulty communication modules, and addressing any underlying issues causing low voltage supply.
5. Can I drive my vehicle with the OBDII code B1103 present?
- It is generally safe to drive the vehicle with the B1103 code present, but it is recommended to address the issue promptly to prevent potential communication problems between vehicle modules.
6. How serious is the OBDII code B1103 (Communication Voltage Too Low)?
- While the code itself may not directly affect the drivability of the vehicle, it can lead to communication issues between important vehicle modules, potentially impacting overall vehicle performance.
7. Is it possible to reset the OBDII code B1103 without fixing the underlying issue?
- Resetting the code without addressing the underlying cause will not solve the problem in the long term. It is important to diagnose and repair the issue to prevent the code from reoccurring.
8. Can a DIY enthusiast fix the OBDII code B1103 at home?
- Depending on the root cause, DIY enthusiasts with automotive repair experience may be able to address the B1103 code by inspecting wiring, connections, and replacing faulty components. However, professional diagnosis may be required for complex issues.
9. How much does it typically cost to repair the OBDII code B1103?
- The cost of repairing the B1103 code can vary depending on the underlying cause, parts needed for replacement, and labor charges. It is advisable to obtain quotes from automotive professionals for an accurate estimate.
10. Are there any preventative measures to avoid the OBDII code B1103 in the future?
- Regularly inspecting and maintaining the vehicle's wiring harnesses, ensuring secure connections, and addressing any electrical issues promptly can help prevent the recurrence of the B1103 code.
Discuss the causes and fixes for B1103 OBDII Code
Code B1103 comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
