B0093 code meaning
Left Side Restraints Sensor 3
What B0093 means
B0093 is the third left-side crash sensor. Mitsubishi mounts it at the left C-pillar, names it C-PILLAR SAT SEN LH and gives the J2012 wording Left Side Restraints Sensor 3. Unlike the B-pillar unit, it carries the full set of subtypes: -11 when the sensor line is shorted to ground, -55 for a configuration mismatch, -81 when communication with the sensor fails, and others, each confirmed after two seconds with the ignition on. A sensor that far back can give the module an early view of impacts behind the front door. Bosch lists C-pillars among the mounting points for its acceleration satellites, and Continental's gSAT measures acceleration in rigid structure for the same purpose. The airbag lamp lights while B0093 is stored.
B0093 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of B0093
- Airbag warning lamp on
- Left side impact sensing behind the front door is degraded
- Safety note: airbag system; disconnect the battery and keep the wait time before work at the rear pillar, specialist workshop only
Common causes of B0093
- Most likelySensor line shorted to ground or poor contact at the C-pillar plug (subtypes -11/-81)
- PossibleInternal fault of the C-pillar satellite sensor
- PossibleAirbag unit configuration not matching the vehicle (subtype -55)
- Less likelyInternal fault of the airbag diagnosis unit
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Left side impact sensor 3SRS wiringSRS control module
What each part of B0093 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). |
| 93 | The exact fault in that area. |
What to do next
- Note B0093 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 B0093
What does B0093 mean?
B0093 means "Left Side Restraints Sensor 3". B0093 is the third left-side crash sensor. It is a generic code, so it means the same on every make.
Is it safe to drive with B0093?
B0093 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will B0093 fail an emissions test?
B0093 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 B0093 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will B0093 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.