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.

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HOMESERVICE MANUALSFORD2009CUTAWAY E250, 4R70WREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESMECHANICAL - HYDRAULICAUXILIARY BRAKE SYSTEMDIAGNOSIS AND TESTINGAUXILIARY BRAKE SYSTEM - TRAILER BRAKE CONTROL (TBC) MODULESYMPTOM CHART

2009 Ford Cutaway E250, 4R70W

Symptom Chart

2009 Ford Cutaway E250, 4R70WSECTION Symptom Chart

Symptom Chart

SYMPTOM CHART

Condition	Possible Sources	Action
No communication with the Trailer Brake Control (TBC) module	Fuse(s) Wiring, terminals or connectors TBC module	REFER to MODULE COMMUNICATIONS NETWORK to diagnose the no communication problem.
Without a trailer connected to the vehicle and with the ignition key turned to the RUN position, the TBC module display does not light up/prove out	Fuse(s) Wiring, terminals or connectors	NOTE: The TBC module will not prove out if the battery voltage is above 16 volts or below 9 volts.
	TBC module	Go To PINPOINT TEST B .
Without a trailer connected to the vehicle and with the ignition key turned to the RUN position, the TBC module display lights up/proves out, but does not light up afterward (will not illuminate with input from the gain + button or slide lever)	Instrument Cluster (IC) not configured for TBC system	REFER to DTC U2202 in the TRAILER BRAKE CONTROL (TBC) MODULE DTC CHART .
When the ignition key is turned to the RUN position, the TBC module display does light up/prove out but the trailer brakes are inoperative	Fuse(s) Wiring, terminals or connectors TBC module Customer trailer	Go To PINPOINT TEST D .
The trailer brakes are always engaged	Wiring, terminals or connectors TBC module Customer trailer	Go To PINPOINT TEST E .
The message center intermittently displays TRAILER DISCONNECTED or WIRING FAULT ON TRAILER while towing a trailer	Wiring, terminals or connectors Customer trailer	Go To PINPOINT TEST E .
The message center displays TBC FAULT	DTCs present IC not configured for TBC system	RETRIEVE and RECORD the DTCs. Go to the TRAILER BRAKE CONTROL (TBC) MODULE DTC CHART . If no DTCs are present in the TBC module, REFER to DTC U2202 in the TRAILER BRAKE CONTROL (TBC) MODULE DTC CHART .
The message center displays TRAILER FAULT	Wiring, terminals or connectors TBC module Customer trailer	Go To PINPOINT TEST C .

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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.