AutoCodes – Ford – C2806 Ford

C2806 Ford Code - Trailer Brake Output Circuit Short To VBattery

Quick Answer

The braking energy that is provided to the trailer is varied with a Pulse Width Modulated (PWM) signal along the circuit that switches between 0 volt and battery voltage, the higher the duty cycle the more braking power available. Common causes include Faulty Trailer Brake Control (TBC) Module, Trailer Brake Control (TBC) Module harness is open or shorted, Trailer Brake Control (TBC) 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
C2806 Ford indicates Trailer Brake Output Circuit Short To VBattery .
Common causes
Common causes include Faulty Trailer Brake Control (TBC) Module, Trailer Brake Control (TBC) Module harness is open or shorted, Trailer Brake Control (TBC) 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 7,021
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Jun 14, 2020
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Code C2806 Ford Description

The braking energy that is provided to the trailer is varied with a Pulse Width Modulated (PWM) signal along the circuit that switches between 0 volt and battery voltage, the higher the duty cycle the more braking power available. The Trailer Brake Control (TBC) Module varies the PWM signal based on various inputs such as the brake pressure transducer, TBC module manual slider switch and the TBC module gain buttons. With the vehicle stationary and with the manual slider switch fully to the left with a gain of 10, there should be greater than 10-12 volts supplied to pin 3 of the 7-pin trailer tow connector. Every 4 seconds the TBC module sends a voltage pulse along circuit CAT19 (BU) to pin 3 of the 7-pin trailer tow connector to determine whether or not a trailer is connected.
OBDII Code C2806 Ford - Trailer Brake Output Circuit Short To VBattery  - AutoCodes.com
C2806 Ford Code - Trailer Brake Output Circuit Short To VBattery

What are the Possible Causes of the DTC C2806 Ford?

  • Faulty Trailer Brake Control (TBC) Module
  • Trailer Brake Control (TBC) Module harness is open or shorted
  • Trailer Brake Control (TBC) Module circuit poor electrical connection

How to Fix the DTC C2806 Ford?

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 C2806 Ford 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 C2806 Ford Code

1. What are the common symptoms of OBDII code C2806 Ford (Trailer Brake Output Circuit Short To VBattery)?

- Common symptoms include inoperative trailer brakes, illuminated trailer brake warning lights on the dashboard, and potential loss of trailer brake functionality.

2. What are the possible causes of OBDII code C2806 Ford (Trailer Brake Output Circuit Short To VBattery)?

- Possible causes include a short circuit in the trailer brake wiring, damaged trailer brake controller, faulty trailer brake switch, or issues with the vehicle's electrical system.

3. How can I diagnose OBDII code C2806 Ford (Trailer Brake Output Circuit Short To VBattery)?

- Diagnosis typically involves checking the trailer brake wiring for shorts, inspecting the trailer brake controller for damage, testing the trailer brake switch, and using a diagnostic scanner to read the trouble code.

4. Can I still drive my vehicle with OBDII code C2806 Ford (Trailer Brake Output Circuit Short To VBattery) present?

- It is not recommended to drive the vehicle with this code present, as it may result in unsafe trailer brake operation or complete failure of the trailer brake system.

5. How can I repair OBDII code C2806 Ford (Trailer Brake Output Circuit Short To VBattery)?

- Repair methods may include repairing the short circuit in the trailer brake wiring, replacing the trailer brake controller or switch if faulty, and ensuring proper electrical connections.

6. Is it safe to tow a trailer with OBDII code C2806 Ford (Trailer Brake Output Circuit Short To VBattery)?

- It is not safe to tow a trailer with this code present, as the trailer brake system may not function correctly, leading to potential accidents or loss of control while towing.

7. Are there any preventive measures to avoid OBDII code C2806 Ford (Trailer Brake Output Circuit Short To VBattery)?

- Regularly inspecting the trailer brake system for any signs of wear or damage, ensuring proper installation of trailer brake components, and maintaining good electrical connections can help prevent this code from appearing.

8. Can a DIY enthusiast fix OBDII code C2806 Ford (Trailer Brake Output Circuit Short To VBattery)?

- Depending on the individual's skill level and knowledge of automotive electrical systems, a DIY enthusiast may be able to diagnose and repair this code. However, it is recommended to seek professional help for complex electrical issues.

9. Will resetting the OBDII system clear the C2806 Ford code (Trailer Brake Output Circuit Short To VBattery)?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing the code is not addressed and repaired, it is likely to reappear upon driving the vehicle again.

10. Can OBDII code C2806 Ford (Trailer Brake Output Circuit Short To VBattery) affect the vehicle's overall performance?

- While this code may not directly affect the vehicle's engine performance, it can impact the safe operation of the trailer brake system, which is crucial for towing and overall driving safety.

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