AutoCodes – Buick – C111B Buick

C111B Buick Code - Trailer Brake Power Control Module System Voltage

Quick Answer

The Chassis Control Module-Auxiliary receives inputs from the Trailer Brake Power Control Module; these inputs are used to determine trailer connection and the amount of voltage supplied to the trailer brakes. Common causes include Faulty Trailer Brake Power Control Module, Trailer Brake Power Control Module harness is open or shorted, Trailer Brake Power Control 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: C111B Buick indicates Trailer Brake Power Control Module System Voltage.
Common causes: Common causes include Faulty Trailer Brake Power Control Module, Trailer Brake Power Control Module harness is open or shorted, Trailer Brake Power Control 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 853

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 17, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code C111B Buick Description

The Chassis Control Module-Auxiliary receives inputs from the Trailer Brake Power Control Module; these inputs are used to determine trailer connection and the amount of voltage supplied to the trailer brakes. The Diagnostic Trouble Code (DTC) will be set when the Trailer Brake Power Control Module detects a short to ground, open, a short to voltage, or a plausibility failure on the trailer brake output circuit.

OBDII Code C111B Buick - Trailer Brake Power Control Module System Voltage - AutoCodes.com — C111B Buick Code - Trailer Brake Power Control Module System Voltage

What does this mean?

What are the Possible Causes of the DTC C111B Buick?

Faulty Trailer Brake Power Control Module
Trailer Brake Power Control Module harness is open or shorted
Trailer Brake Power Control Module circuit poor electrical connection
Faulty Chassis Control Module-Auxiliary

How to Fix the DTC C111B 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.

What does this mean?

Code Tech Notes

C111B:03 Trailer Brake Power Control Module System Voltage Below Threshold
C111B:07 Trailer Brake Power Control Module System Voltage Above Threshold
C111B:5A Trailer Brake Power Control Module System Voltage Plausibility Failure

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C111B 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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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 C111B Buick Code

1. What are common symptoms of OBDII code C111B on a Buick related to the Trailer Brake Power Control Module System Voltage?

The common symptoms include trailer brake system malfunctions, ABS warning light illuminated on the dashboard, and potential issues with the vehicle's brake performance.

2. What are the possible causes of OBDII code C111B on a Buick indicating an issue with the Trailer Brake Power Control Module System Voltage?

The code C111B can be triggered by electrical faults in the trailer brake power control module, wiring issues, damaged connectors, or a malfunctioning power control module itself.

3. How can I diagnose the OBDII code C111B on my Buick related to the Trailer Brake Power Control Module System Voltage?

A thorough inspection of the trailer brake system wiring, connectors, and power control module is necessary. Using a diagnostic scanner to read and clear the code can help identify the root cause of the issue.

4. Is it safe to drive my Buick with OBDII code C111B indicating a problem with the Trailer Brake Power Control Module System Voltage?

It is not recommended to drive the vehicle with unresolved trailer brake system issues as it can affect overall brake performance and safety. It's best to address the problem promptly.

5. How can I repair OBDII code C111B on my Buick associated with the Trailer Brake Power Control Module System Voltage?

Repairing the issue may involve repairing or replacing damaged wiring, connectors, or the trailer brake power control module itself. Seeking assistance from a qualified mechanic is advisable for proper diagnosis and repair.

6. Can a DIY enthusiast fix OBDII code C111B on a Buick related to the Trailer Brake Power Control Module System Voltage?

While some basic troubleshooting steps can be performed by a DIY enthusiast, dealing with electrical components and brake systems requires specialized knowledge and tools. It's best to consult a professional mechanic for proper diagnosis and repair.

7. How much does it typically cost to repair OBDII code C111B on a Buick associated with the Trailer Brake Power Control Module System Voltage?

The cost of repairing code C111B can vary depending on the extent of the issue, parts needed for replacement, and labor costs. It's recommended to obtain quotes from different repair shops for an accurate estimate.

8. Are there any preventive measures to avoid OBDII code C111B on a Buick related to the Trailer Brake Power Control Module System Voltage?

Regular inspection of the trailer brake system, proper maintenance, and addressing any electrical issues promptly can help prevent code C111B from occurring. Using quality trailer brake components is also beneficial.

9. Can OBDII code C111B on a Buick be intermittent or permanent?

The code C111B related to the Trailer Brake Power Control Module System Voltage can be intermittent, especially if the issue is with loose wiring or intermittent electrical faults. However, it's important to address the problem to prevent permanent damage.

10. Will resetting the OBDII system clear code C111B on a Buick associated with the Trailer Brake Power Control Module System Voltage?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue with the trailer brake power control module system voltage is not addressed, the code is likely to reappear. It's essential to diagnose and repair the root cause of the problem.