Ford error code U0137
Lost communication with Trailer Brake Control Module (set in ABS).
What to check, and in what order, is in the app. The flow Ford - trailer not detected: identify the generation first walks this code step by step with the pass/fail measurements, wiring schematics and procedures that go with it, and it works offline in the bay.
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- Trailer Detection Field Manual Rev. 1.0 + Engineering Supplement Rev. BIn-house (shop technical reference)
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