AutoCodes – Lincoln – C2806 Lincoln

C2806 Lincoln 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 Lincoln 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.
AI answers can be wrong. Verify repairs with testing. Open full chat
Code Popularity 1,017
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 Lincoln 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 Lincoln - Trailer Brake Output Circuit Short To VBattery  - AutoCodes.com
C2806 Lincoln Code - Trailer Brake Output Circuit Short To VBattery

What are the Possible Causes of the DTC C2806 Lincoln?

  • 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 Lincoln?

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 Lincoln 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 C2806 Lincoln code?

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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 Lincoln Code

1. What are common symptoms of OBDII code C2806 in a Lincoln related to the Trailer Brake Output Circuit Short To VBattery?

- Common symptoms include the trailer brake system not functioning properly, warning lights on the dashboard, and potential issues with trailer brake lights.

2. What are some possible causes of OBDII code C2806 in a Lincoln indicating a Trailer Brake Output Circuit Short To VBattery?

- Possible causes include a short circuit in the wiring, a faulty trailer brake controller, a damaged brake output circuit, or a malfunctioning power supply.

3. How can I diagnose the issue causing OBDII code C2806 in my Lincoln related to the Trailer Brake Output Circuit Short To VBattery?

- To diagnose the problem, you can perform a visual inspection of the wiring, test the trailer brake controller, check the brake output circuit for continuity, and inspect the power supply.

4. Can I still drive my Lincoln with OBDII code C2806 indicating a Trailer Brake Output Circuit Short To VBattery?

- It is not recommended to drive the vehicle with this issue as it can affect the operation of the trailer brake system and pose a safety risk.

5. How can I repair OBDII code C2806 in my Lincoln for the Trailer Brake Output Circuit Short To VBattery?

- Repair options include fixing the short circuit in the wiring, replacing the trailer brake controller if faulty, repairing the brake output circuit, or addressing any power supply issues.

6. Is it possible to reset OBDII code C2806 in my Lincoln after addressing the Trailer Brake Output Circuit Short To VBattery issue?

- Once the underlying problem has been resolved, you can reset the code using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes.

7. Will OBDII code C2806 in a Lincoln indicating a Trailer Brake Output Circuit Short To VBattery affect vehicle performance?

- While the code may not directly impact the performance of the vehicle, it can lead to issues with the trailer brake system and potentially affect towing capabilities.

8. How can I prevent OBDII code C2806 from reoccurring in my Lincoln after repairing the Trailer Brake Output Circuit Short To VBattery problem?

- To prevent the code from coming back, ensure all repairs are done correctly, regularly inspect the trailer brake system, and address any potential wiring or component issues promptly.

9. Can a DIY enthusiast with basic automotive knowledge fix OBDII code C2806 related to the Trailer Brake Output Circuit Short To VBattery in a Lincoln?

- Depending on the exact cause, a DIY enthusiast may be able to address simpler issues like checking wiring connections or replacing components like fuses. However, more complex problems may require professional assistance.

10. Are there any safety considerations to keep in mind when dealing with OBDII code C2806 in a Lincoln related to the Trailer Brake Output Circuit Short To VBattery?

- It is crucial to prioritize safety when working on the trailer brake system, as faulty brakes can pose a serious risk. Always follow proper repair procedures, use appropriate tools, and consider seeking help from a qualified mechanic if needed.

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