B0860License Plate Lamp Circuit
- Generic OBD-II code · Body
- How the car detects it
- B0860 is not traceable in public J2012 extracts, and no manufacturer or regulator text refers to it. The title describes the lamp lighting the rear number plate. GM's 2011 Saab 9-5 switches it through the body control module whenever parking or dipped lights are selected, logging B3883 02 for a grounded and B3883 04 for an open feed. The older Saab 9-3 uses the same number in its rear electrical centre with stated limits: an open circuit below 20 mA, a short once over 3.5 A flows for longer than 10 ms, which also cuts the output. FMVSS 108 defines the licence plate lamp and requires it on every car. A dark plate light is not a driving hazard, but it is a roadworthiness defect that police checks can pick up.
- What you may notice
- Number plate not illuminated with lights on
- Lamp warning in the display
- Plate lamp stays on permanently in some short-circuit cases
- Likely causes
- LikelyPlate lamp bulb burnt out
- PossibleWater in the lamp housing corroding contacts
- PossibleWire break in the boot lid hinge area
- RareLamp output of the body or rear module faulty
- Repair
- Easy · Often possible to do yourself.Typical cost: €5 – €150
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.