B0052 code meaning
Passenger Seat Belt Sensor
What B0052 means
B0052 concerns the front passenger's buckle sensor, reporting to the airbag module whether the tongue is latched. That signal feeds the passenger belt reminder that FMVSS 208 requires at the front outboard seats and helps the module decide how the passenger airbag and pretensioner fire. Mitsubishi uses the code in exactly this sense: its SRS manual stores B0052 with byte 11, 12, 13, 29 or 2B for a grounded line, short to supply, open circuit, invalid signal or short to another line, each after 2 seconds with the ignition on. FCA parts guidance for its restraint controller in the Dart, Cherokee and Chrysler 200 calls B0052-13 an open passenger belt sensor. GM, by contrast, logs a deployment under B0052 in its 2011 Global A modules. Airbag lamp on.
B0052 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of B0052
- Airbag warning lamp on
- Passenger belt reminder warns although the belt is fastened, or stays silent
- Passenger airbag and pretensioner strategy may assume an unbelted occupant
- Safety note: the buckle plug sits under the seat next to airbag and pretensioner plugs; only unplug it with the battery disconnected and the wait time observed
Common causes of B0052
- Most likelyLoose or corroded buckle connector under the passenger seat
- PossibleFaulty Hall sensor inside the passenger buckle
- PossibleBuckle lead pinched or torn by the seat rails or a mat fixing
- Less likelyInput fault inside the airbag control module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Seat belt buckle switchSRS seat wiringSRS control module
What each part of B0052 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). |
| 52 | The exact fault in that area. |
What to do next
- Note B0052 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 B0052
What does B0052 mean?
B0052 means "Passenger Seat Belt Sensor". B0052 concerns the front passenger's buckle sensor, reporting to the airbag module whether the tongue is latched. It is a generic code, so it means the same on every make.
Is it safe to drive with B0052?
B0052 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will B0052 fail an emissions test?
B0052 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 B0052 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will B0052 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.