B009D code meaning
Right Side Restraints Sensor 4
What B009D means
B009D opens the second half of the right-side sensor row, after B0096 to B0098. No carmaker documents this code publicly; Mitsubishi stops its right row at the C-pillar sensor B0098, and Honda's Fit and HR-V use only two side sensors per side. What a failing side satellite means in practice is shown by FCA recall 19V-449: on 2019 Jeep Cherokees the restraint controller could lose contact with acceleration sensors, which lit the airbag lamp and risked late or no deployment, so the sensors were replaced. Bosch's PSI5-linked SMA773 is an example of such a satellite, measuring two axes up to 60 g. A stored B009D therefore means the module has lost or rejected a fourth right sensor; its location comes from the maker's documentation. The airbag warning lamp stays lit.
B009D at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of B009D
- Airbag warning lamp on
- Right side impact detection in the area of that sensor is weaker
- Safety note: airbag system; disconnect the battery and keep the wait time before work on sensors, specialist workshop only
Common causes of B009D
- Most likelyCommunication with the fourth right sensor lost through wiring, plug or sensor fault
- PossibleInternal fault of the fourth right crash satellite
- Less likelyAirbag module coded for a sensor layout the vehicle does not have
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Right side restraints sensor 4SRS wiringSRS control module
What each part of B009D 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). |
| 9D | The exact fault in that area. |
What to do next
- Note B009D 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 B009D
What does B009D mean?
B009D means "Right Side Restraints Sensor 4". B009D opens the second half of the right-side sensor row, after B0096 to B0098. It is a generic code, so it means the same on every make.
Is it safe to drive with B009D?
B009D does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will B009D fail an emissions test?
B009D 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 B009D to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will B009D clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.