B0810 code meaning
Left Headlamp Low Beam Circuit
What B0810 means
Whether any carmaker sets B0810 is unknown – the number shows up in no J2012 excerpt and no service literature. The title covers the left dipped-beam output. The GM-era Saab 9-3 checks it in the front electrical centre under the number B2575: with the switch at dipped beam (position 2), a draw below 0.8 A sets B2575 04 (open) and one of 7.9–30 A sets B2575 0B, which may also mean a bulb of the wrong rating. With xenon lamps the ignition has to be on for 30 s before the test can run. HELLA explains why: the xenon ballast first fires the lamp with up to 30 kV and only then regulates it to a steady 35 W. A dark left dipped beam is a road-safety defect and should be repaired before driving at night. Right side: B0811.
B0810 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.2 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of B0810
- Left dipped beam dark, lamp failure message in the display
- Reduced view of the left road edge at night; repair before driving in the dark
- Light flickers or fails only after the lamp has warmed up
Common causes of B0810
- Most likelyLow-beam bulb burnt out
- PossibleBulb of the wrong wattage fitted
- PossibleXenon ballast or igniter faulty
- PossibleCorroded headlamp plug or poor ground
- Less likelyLamp output of the lighting or body module faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Left low beam lampBody control module
What each part of B0810 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). |
| 10 | The exact fault in that area. |
What to do next
- Note B0810 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 B0810
What does B0810 mean?
B0810 means "Left Headlamp Low Beam Circuit". Whether any carmaker sets B0810 is unknown – the number shows up in no J2012 excerpt and no service literature. It is a generic code, so it means the same on every make.
Is it safe to drive with B0810?
B0810 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will B0810 fail an emissions test?
B0810 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 B0810 to fix?
Difficulty: easy. A typical repair takes 0.2 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will B0810 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.