AutoCodes – GMC – B1101 GMC

B1101 GMC Code - Battery Voltage Too High

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: B1101 GMC indicates Battery Voltage Too High.
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.

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Code Popularity 1,072

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 22, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1101 GMC Description

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.
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.

OBDII Code B1101 GMC - Battery Voltage Too High - AutoCodes.com — B1101 GMC Code - Battery Voltage Too High

What does this mean?

What are the Possible Causes of the DTC B1101 GMC?

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 B1101 GMC?

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 B1101 GMC 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 B1101 GMC code?

Need more information on how to fix the B1101 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1101 GMC code diagnosed by a professional: Find a repair shop in your area

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.

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1101 GMC Code

1. What are the common symptoms of OBDII code B1101 GMC (Battery Voltage Too High)?

- The common symptoms include the battery warning light illuminated on the dashboard, erratic electrical behavior in the vehicle, and potential issues with starting the engine.

2. What can cause the OBDII code B1101 GMC to trigger?

- The code B1101 GMC is triggered when the vehicle's onboard computer detects that the battery voltage is higher than the specified threshold, indicating a potential issue with the charging system.

3. How can I diagnose the cause of OBDII code B1101 GMC?

- To diagnose the cause, you can use a multimeter to measure the battery voltage, check the alternator output, inspect the battery terminals for corrosion, and ensure the battery is in good condition.

4. What are some possible repair tips for resolving OBDII code B1101 GMC?

- Repair tips include checking and replacing the alternator if necessary, inspecting and cleaning the battery terminals, testing the battery for proper functioning, and ensuring all electrical connections are secure.

5. Can a loose or damaged alternator belt cause OBDII code B1101 GMC?

- Yes, a loose or damaged alternator belt can cause the alternator to not function properly, leading to fluctuations in battery voltage and triggering the OBDII code B1101 GMC.

6. Is it safe to continue driving with OBDII code B1101 GMC active?

- It is not recommended to continue driving with the code active as it can lead to further electrical issues and potential damage to the vehicle's components. It is best to address the underlying cause promptly.

7. Will resetting the OBDII code B1101 GMC make the issue go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue causing the high battery voltage is not addressed, the code is likely to reappear. It is important to diagnose and fix the root cause.

8. Can extreme temperature fluctuations affect OBDII code B1101 GMC?

- Yes, extreme temperature fluctuations can affect the battery's performance and the charging system, potentially leading to high battery voltage issues and triggering the OBDII code B1101 GMC.

9. How long does it typically take to repair OBDII code B1101 GMC?

- The repair time can vary depending on the underlying cause of the high battery voltage. Simple fixes like cleaning terminals may take a short time, while replacing the alternator or battery could take longer.

10. Should I seek professional help to fix OBDII code B1101 GMC?

- If you are not familiar with automotive electrical systems or lack the necessary tools, it is advisable to seek professional help to diagnose and repair OBDII code B1101 GMC to ensure the issue is resolved correctly.