GM error code B3885-04
Trailer left tail lamp circuit (U1D vehicles). Presents as trailer lighting dead or 'Trailer Disconnected Check Connection'.
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
- GM PIT5648C - false Trailer Disconnected Check ConnectionGeneral Motors / NHTSA ODI
Related codes
- C1114Circuit 47 (trailer brake control) fault. GM's usage: short to ground…
- B3886-04Trailer right tail lamp circuit (U1D vehicles).
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