C2806 - Trailer Brake Output Circuit Short To VBattery

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

  • 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

Possible symptoms

  • Anti-Lock Brake System (ABS) Warning Light ON
  • Engine Light ON (or Service Engine Soon Warning Light)

C2806 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 - Trailer Brake Output Circuit Short To VBattery  - AutoCodes.com

C2806 Information for specific makes

  • C2806 FORD Trailer Brake Output Circuit Short To VBattery
  • C2806 LINCOLN Trailer Brake Output Circuit Short To VBattery
  • C2806 MERCURY Trailer Brake Output Circuit Short To VBattery

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C2806 Comments

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