B1103 Chevrolet 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 Chevrolet 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 Chevrolet 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 Chevrolet?
- 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 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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B1103 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 B1103 Chevrolet Code
1. What are the common symptoms of OBDII code B1103 in a Chevrolet related to communication voltage being too low?
- Common symptoms include intermittent or complete loss of communication with vehicle modules, malfunctioning dashboard warning lights, and issues with diagnostic tool connectivity.
2. What are some possible causes of the B1103 OBDII code indicating low communication voltage in a Chevrolet?
- Potential causes may include a faulty powertrain control module (PCM), damaged wiring harness or connectors, a drained or weak vehicle battery, or a malfunctioning communication network module.
3. How can I diagnose the communication voltage issue indicated by OBDII code B1103 in my Chevrolet?
- To diagnose the issue, consider inspecting the vehicle's electrical system, checking for loose or damaged connections, testing the battery voltage, and using a diagnostic scanner to assess communication between modules.
4. Can a DIY enthusiast repair the low communication voltage problem associated with code B1103 in a Chevrolet?
- Depending on the root cause, DIY repairs may involve checking and tightening connections, replacing damaged wiring, or reprogramming the PCM. However, complex electrical issues may require professional assistance.
5. What are some tips for repairing the communication voltage issue causing OBDII code B1103 in a Chevrolet?
- Tips for repair may include performing a thorough visual inspection of wiring and connectors, testing the battery and charging system, resetting the PCM, and ensuring proper grounding of the vehicle's electrical components.
6. Is it safe to continue driving my Chevrolet with the B1103 OBDII code indicating low communication voltage?
- It is not recommended to drive the vehicle with unresolved communication voltage issues, as this can lead to further electrical problems and potential loss of critical vehicle functions. Seek professional diagnosis and repair promptly.
7. How can I prevent the recurrence of the communication voltage problem triggering OBDII code B1103 in my Chevrolet?
- To prevent future issues, regularly inspect and maintain the vehicle's electrical system, keep connectors clean and secure, avoid overloading the electrical system, and promptly address any warning lights or diagnostic trouble codes.
8. What are the potential risks of ignoring the B1103 OBDII code related to low communication voltage in a Chevrolet?
- Ignoring the code can result in continued communication failures between vehicle modules, loss of critical functions like ABS or airbags, reduced fuel efficiency, and potential safety hazards while driving.
9. Can a low vehicle battery voltage cause the OBDII code B1103 to trigger in a Chevrolet?
- Yes, a weak or drained vehicle battery can lead to low communication voltage and trigger the B1103 code. It is essential to ensure the battery is in good condition and properly charged to prevent such issues.
10. How long does it typically take to diagnose and repair the low communication voltage problem associated with OBDII code B1103 in a Chevrolet?
- The time needed for diagnosis and repair can vary based on the underlying cause and complexity of the issue. Simple fixes like checking connections may take less time, while more intricate electrical repairs can require professional expertise and additional time.
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