B0841 code meaning
Right Rear Turn Signal Circuit
What B0841 means
No public record of B0841 exists in J2012 lists, OEM manuals or bulletins. The title refers to the right rear indicator circuit. The second-generation Saab 9-3 logs this lamp in its rear electrical centre as B0525: under 50 mA is treated as open (04), more than 6 A for over 6 ms as a short to ground (02), after which the output is switched off. In both cases the driver sees a message and a doubled flash rate. FMVSS 108 accepts such a change in flash rate as the required failure indication. HELLA recommends checking lamp, holder and plug for corrosion and, on PWM-driven lamps, checking the PWM signal on a scope or scan tool. A dark right rear indicator means turns and lane changes go unannounced to following traffic. Left rear: B0840.
B0841 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.2 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of B0841
- Indicators flash at double speed when signalling right
- Right rear indicator does not light, message in the display
Common causes of B0841
- Most likelyRight rear indicator bulb burnt out
- PossibleCorroded contacts in the bulb holder
- PossiblePinched wire shorting to body ground
- Less likelyLamp driver in the rear module faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Right rear turn signalBody control module
What each part of B0841 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). |
| 41 | The exact fault in that area. |
What to do next
- Note B0841 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 B0841
What does B0841 mean?
B0841 means "Right Rear Turn Signal Circuit". No public record of B0841 exists in J2012 lists, OEM manuals or bulletins. It is a generic code, so it means the same on every make.
Is it safe to drive with B0841?
B0841 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will B0841 fail an emissions test?
B0841 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 B0841 to fix?
Difficulty: easy. A typical repair takes 0.2 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will B0841 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.