Jeep / Ram (TTM / ITCM) error code B166A-13
Trailer lamp driver circuit low. Default action: EVIC displays 'trailer disconnected' - a LIGHTING fault printing a disconnection message.
What to check, and in what order, is in the app. The flow Lamp-circuit detection - current, thresholds and LEDs 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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