B0239 code meaning
License Plate Lamp Circuit
What B0239 means
B0239 cannot be traced in any J2012 source or factory document, so its use stays unproven; the same title belongs to B0860. The licence plate lamp lights the rear registration plate and is usually wired with the tail lamps. FMVSS 108 asks that it illuminate the plate without obstruction by body parts. HELLA quotes the European rule that the plate must be readable from 25 m, with no part of it below 2.5 cd/m². Body modules today monitor lighting outputs, and HELLA's Golf 6 example shows the other side of that: after fitting LED rear lamps the module must be recoded, or it reports lamp faults. A circuit fault here leaves the plate dark, which can lead to a police stop.
B0239 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.2 to 1 hours
- Clears after repairWhen cleared with a scanner
Symptoms of B0239
- Rear number plate is not lit with the lights on
- Bulb warning in the cluster, where the car monitors this lamp
Common causes of B0239
- Most likelyPlate lamp bulb or LED unit failed, often from water inside the housing
- PossibleWire broken in the flexible tube between body and tailgate or trunk lid
- Less likelyRetrofitted LED lamp not matched by the body module coding
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
License plate lampBody wiring harness
What each part of B0239 means
| B | Body system: airbags, seat belts, power seats, lights and climate control. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 39 | The exact fault in that area. |
What to do next
- Note B0239 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about B0239
What does B0239 mean?
B0239 means "License Plate Lamp Circuit". B0239 cannot be traced in any J2012 source or factory document, so its use stays unproven; the same title belongs to B0860. It is a generic code, so it means the same on every make.
Is it safe to drive with B0239?
B0239 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will B0239 fail an emissions test?
B0239 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is B0239 to fix?
Difficulty: easy. A typical repair takes 0.2 to 1 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will B0239 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.