AutoCodes – GMC – B1911 GMC

B1911 GMC Code - Generator L Terminal Malfunction

Quick Answer

The Diagnostic Trouble Code (DTC) B1911 indicates a circuit malfunction is preventing the generator from charging. Common causes include Faulty Generator (Alternator), Generator harness is open or shorted, Generator 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: B1911 GMC indicates Generator L Terminal Malfunction.
Common causes: Common causes include Faulty Generator (Alternator), Generator harness is open or shorted, Generator 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 688

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 Jul 27, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1911 GMC Description

The Diagnostic Trouble Code (DTC) B1911 indicates a circuit malfunction is preventing the generator from charging. DTC B1911 will set when the Instrument Panel Cluster (IPC) determines that the circuit is grounded by the generator with the ignition switch in the RUN position and engine speed is greater than 600 RPM. This test is only performed when the ignition switch is in the RUN position, IPC measures engine speed greater than 600 RPM and vehicle diagnostics is not active. When DTC B1911 is set, IPC will display BATTERY NOT CHARGING message and the battery indicator will illuminate.

OBDII Code B1911 GMC - Generator L Terminal Malfunction - AutoCodes.com — B1911 GMC Code - Generator L Terminal Malfunction

What does this mean?

What are the Possible Causes of the DTC B1911 GMC?

Faulty Generator (Alternator)
Generator harness is open or shorted
Generator circuit poor electrical connection

How to Fix the DTC B1911 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 B1911 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 B1911 GMC code?

Need more information on how to fix the B1911 GMC code? Get Access to Factory Service Manuals

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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 B1911 GMC Code

1. What are the common symptoms of OBDII code B1911 GMC (Generator L Terminal Malfunction)?

- Common symptoms include issues with the charging system, such as the battery not charging properly, dashboard warning lights related to the charging system, and dimming headlights.

2. What can cause the OBDII code B1911 GMC to trigger?

- The code B1911 GMC is typically triggered by a malfunction in the generator L terminal circuit, which may be caused by wiring issues, a faulty generator, or a defective generator control module.

3. How can I diagnose the cause of OBDII code B1911 GMC?

- Diagnosing the cause of code B1911 GMC involves checking the wiring and connections related to the generator L terminal, testing the generator output, and inspecting the generator control module for any faults.

4. What are some repair tips for addressing OBDII code B1911 GMC?

- Repair tips may include repairing or replacing damaged wiring, ensuring proper connections at the generator and control module, testing and possibly replacing the generator, and resetting the fault code after repairs are completed.

5. Can I drive my vehicle with OBDII code B1911 GMC present?

- It is not recommended to drive your vehicle with OBDII code B1911 GMC present, as it can lead to issues with the charging system and potentially cause the vehicle to stall or not start.

6. How much does it cost to repair OBDII code B1911 GMC?

- The cost of repairing OBDII code B1911 GMC can vary depending on the underlying cause of the issue, but it may involve costs for diagnostic labor, replacement parts, and any necessary repairs or adjustments.

7. Is OBDII code B1911 GMC a common issue in GMC vehicles?

- OBDII code B1911 GMC (Generator L Terminal Malfunction) can occur in GMC vehicles equipped with OBDII systems, especially in models with charging system components such as the generator and control module.

8. Can a DIY enthusiast fix OBDII code B1911 GMC at home?

- Depending on their expertise, a DIY enthusiast may be able to address OBDII code B1911 GMC by following repair guides, using diagnostic tools, and performing necessary repairs on the charging system components.

9. How often should I check for OBDII code B1911 GMC in my GMC vehicle?

- It is recommended to regularly monitor your GMC vehicle for any OBDII trouble codes, including B1911 GMC, especially if you notice symptoms related to the charging system or dashboard warnings indicating a problem.

10. Are there any preventive measures to avoid encountering OBDII code B1911 GMC?

- To prevent OBDII code B1911 GMC, it is advisable to perform regular maintenance on the charging system components, such as checking the battery, inspecting wiring for damage, and addressing any issues promptly to avoid potential malfunctions.