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 MANUALSFORD2021TRANSIT-350 HD BASE, VAN CARGO EXTENDED, 3.5L ENG VIN 8, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 601 (AUXILIARY BRAKE SYSTEM)
2021 Ford Transit-350 HD Base, Van Cargo Extended, 3.5L Eng VIN 8, AWD
Section 601 (Auxiliary Brake System)
2021 Ford Transit-350 HD Base, Van Cargo Extended, 3.5L Eng VIN 8, AWDSECTION Section 601 (Auxiliary Brake System)
WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
- Description And Operation
- Diagnosis And Testing
- Auxiliary Brake System
- Diagnostic Trouble Code (DTC) Chart
- Symptom Charts
- Pinpoint Tests
- Pinpoint Test A: The Trailer Brakes Are Inoperative
- Pinpoint Test B: The Trailer Brakes Are Always Engaged
- Pinpoint Test C: The Message Center Displays Wiring Fault On Trailer
- Pinpoint Test D: The Message Center Displays Trailer Connected Message When No Trailer Is Connected To The Vehicle
- Pinpoint Test E: The Message Center Displays A False Trailer Disconnected Message When A Trailer Is Connected To The Vehicle
- Pinpoint Test F: The Message Center Displays Trailer Disconnected, Trailer Gain XX.XX, No Trailer After A Trailer Is Connected To The Vehicle And The Manual Slider Switch Is Moved Or A Gain Button Is Pressed.
- Pinpoint Test G: The Message Center Displays Trailer Brake Module Fault When The Vehicle Is Not Equipped With A TBM (Trailer Brake Control Module).
- Pinpoint Test H: B148B:2A, B148B:49, B148C:2A Or U064D:08
- Pinpoint Test I: U3003:16
- Pinpoint Test J: U3003:17
- Pinpoint Test K: U3008:13
- Pinpoint Test L: After Market Trailer Connector Inoperative
- Auxiliary Brake System
- Removal And Installation
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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.