C111B 2017 Chevrolet Silverado 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 2017 Chevrolet Silverado 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.
Code C111B 2017 Chevrolet Silverado Description
What are the Possible Causes of the DTC C111B 2017 Chevrolet Silverado?
- 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 2017 Chevrolet Silverado?
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.
Code Tech Notes
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 2017 Chevrolet Silverado 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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Frequently Asked Questions about C111B 2017 Chevrolet Silverado Code
1. What does the OBDII code C111B mean on a 2017 Chevrolet Silverado?
The code C111B indicates an issue with the Trailer Brake Power Control Module System Voltage, often related to low or inconsistent voltage in the trailer brake circuit.
2. What are the common symptoms of code C111B on a 2017 Chevrolet Silverado?
Symptoms include a "Service Trailer Brake System" message on the dashboard, unresponsive trailer brakes, and reduced or no trailer brake power.
3. What causes the C111B code to appear?
Common causes include a weak or failing vehicle battery, corroded or damaged wiring, poor ground connections, or a faulty trailer brake control module.
4. Can a bad trailer connection cause the C111B code?
Yes, a poor connection at the trailer plug, such as corroded pins or a loose connector, can cause voltage issues that trigger this code.
5. How can I fix the C111B code on my 2017 Chevrolet Silverado?
Start by checking the battery and charging system, inspecting the trailer brake wiring and connectors for damage or corrosion, and ensuring proper grounding. If necessary, replace the trailer brake control module.
6. Can I still drive my Silverado with the C111B code active?
Yes, you can drive the vehicle, but the trailer brakes may not function properly, which can be unsafe when towing. Address the issue promptly.
7. How do I test the trailer brake wiring to diagnose code C111B?
Use a multimeter to check for proper voltage at the trailer plug and continuity in the wiring. Look for any signs of open circuits, shorts, or poor connections.
8. Will replacing the Trailer Brake Power Control Module always fix the C111B code?
Not necessarily. The issue could be related to wiring, grounding, or the vehicle’s battery/charging system. Diagnose thoroughly before replacing the module.
9. Can a malfunctioning alternator trigger the C111B code?
Yes, a failing alternator can cause low system voltage, which may lead to the C111B code being set.
10. Is a software update ever required to clear the C111B code?
In some cases, a software update for the trailer brake control module may be necessary after repairs to ensure proper functionality. Check with your dealership if unsure.
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