GM error code C1114
Circuit 47 (trailer brake control) fault. GM's usage: short to ground gives 'Check Trailer Wiring'; short to power, or a poor trailer ground, gives 'Service Trailer Brake System'.
What to check, and in what order, is in the app. The flow Brake circuit - load, integrity, and what it says about detection 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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