Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Inspection and Verification
2005 Ford Taurus SEL, 4D SedanSECTION Inspection and Verification
WARNING: This page is about a different car, the 2006 Ford Pickup, 2006 Ford F550 Super Duty, 2006 Ford F450 Super Duty, and 2006 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
A trailer brake emulator tool is available to verify that the TBC module and vehicle wiring are functioning correctly.
- Verify the TBC system is correctly installed by checking that the vehicle is equipped with a brake pressure transducer on the master cylinder. If the brake pressure transducer is not present, then the TBC system has been erroneously installed.
- Verify the customer concern.
- Verify that the trailer brakes are electric-actuated drum type brakes.
- Verify the stoplamps operate correctly by applying and releasing the brake pedal with the ignition switch in the OFF position and the trailer disconnected. If the stoplamps do not operate correctly, refer to EXTERIOR LIGHTING . If the stoplamps operate correctly, proceed to the next step.
- Visually inspect for obvious signs of mechanical or electrical damage.VISUAL INSPECTION CHART
Mechanical Electrical - Base brake system
- Trailer
- Brake pressure transducer
- Brake pressure switch
- Battery junction box (BJB) fuse 12 (2A)
- Central junction box (CJB) fuse(s):
- 20 (15A)
- 28 (10A)
- 101 (30A)
- Circuitry
- Trailer brake control (TBC) module
- If the cause is not visually evident, connect the scan tool to the data link connector (DLC) and select the vehicle to be tested from the scan tool menu. If the scan tool does not communicate with the vehicle:
- check that the program card is correctly installed.
- check the connections to the vehicle.
- check the ignition switch position.
- If the scan tool still does not communicate with the vehicle, refer to scan tool's operating manual.
- Carry out the scan tool data link test. If the scan tool responds with:
- CAN, ISO or UBP circuit fault; all electronic control units no response/not equipped, refer to MODULE COMMUNICATIONS NETWORK .
- No response/not equipped for the TBC, GO to PINPOINT TEST A .
- System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs, and carry out self-test diagnostics for the TBC.
- If the DTCs retrieved are related to the concern, go to the TRAILER BRAKE CONTROL (TBC) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX to continue diagnosis.
- If no DTCs related to the concern are retrieved, GO to SYMPTOM CHART to continue diagnosis.
NOTE:
The TBC does not function with electric-over-hydraulic or surge trailer brake types.
NOTE:
Always retrieve the continuous DTCs after running the self-test.
TRAILER BRAKE CONTROL (TBC) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX
| DTC | Description | Source | Action |
|---|---|---|---|
| B1317 | Battery Voltage High | TBC Module | GO to PINPOINT TEST B . |
| B1318 | Battery Voltage Low | TBC Module | GO to PINPOINT TEST B . |
| B1342 | ECU is Faulted | TBC Module | REPAIR all other DTCs. CLEAR the DTCs. TEST the system for normal operation. If the DTC returns, INSTALL a new TBC. REFER to TRAILER BRAKE CONTROL (TBC) MODULE in this section. |
| B1863 | TBC Ground Open Circuit | TBC Module | GO to PINPOINT TEST A . |
| C2797 | Brake Pressure Transducer Supply Short to Battery | TBC Module | GO to PINPOINT TEST C . |
| C2798 | Brake Pressure Transducer Supply Short to Ground | TBC Module | GO to PINPOINT TEST C . |
| C2800 | Brake Pressure Transducer Sense Circuit Open | TBC Module | GO to PINPOINT TEST C . |
| C2801 | Brake Pressure Transducer Sense Short to Ground | TBC Module | GO to PINPOINT TEST C . |
| C2803 | Brake Pressure Transducer Sense Circuit Failure | TBC Module | GO to PINPOINT TEST C . |
| C2806 | Trailer Brakes Wiring Circuit Short to Battery | TBC Module | If DTC C2806 is only present with a trailer connected to the trailer tow connector, SEND the trailer to an authorized camper/trailer repair center. If DTC C2806 is present without a trailer connected, RECORD and CLEAR the DTCs. CYCLE the ignition switch and RETRIEVE any DTCs. If DTC C2806 returns (without a trailer connected to the trailer tow connector), GO to PINPOINT TEST D . For all other returning DTCs, CARRY OUT the appropriate action as directed by this index. |
| C2807 | Trailer Brakes Wiring Circuit Short to Ground | TBC Module | If DTC C2807 is only present with a trailer connected to the trailer tow connector, SEND the trailer to an authorized camper/trailer repair center. If DTC C2807 is present without a trailer connected, RECORD and CLEAR the DTCs. CYCLE the ignition switch and RETRIEVE any DTCs. If DTC C2807 returns (without a trailer connected to the trailer tow connector), GO to PINPOINT TEST D . For all other returning DTCs, CARRY OUT the appropriate action as directed by this index. |
| C2808 | Trailer Brakes Output Overload | TBC Module | If DTC C2808 is only present with a trailer connected to the trailer tow connector, SEND the trailer to an authorized camper/trailer repair center. If DTC C2808 is present without a trailer connected, RECORD and CLEAR the DTCs. CYCLE the ignition switch and RETRIEVE any DTCs. If DTC C2808 returns (without a trailer connected to the trailer tow connector), GO to PINPOINT TEST D . For all other returning DTCs, CARRY OUT the appropriate action as directed by this index. |
| U1900 | CAN Communication Bus Fault-Receive Error | TBC Module | GO to PINPOINT TEST A . |
For a complete master list of DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES .
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.