GM error code B3886-04
Trailer right tail lamp circuit (U1D vehicles).
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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- GM PIT5747B - Trailer Lighting Complaints With Trailering App (RPO U1D)General Motors / NHTSA ODI
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