B0337 code meaning
Passenger Seat Heater Circuit
What B0337 means
There is no public trace of B0337 in J2012 lists or factory data; its subject repeats B0342. It covers the passenger seat heating mat and its feed. Because that seat is often empty, a fault may go unnoticed for a long time. Saab's 9-3 climate module reports B2433 01 when the right heater is shorted to battery voltage and B2434 06 for an open or grounded circuit; GM's 2011 Saab 9-5 uses B2430 0B/0D/0E. Chrysler's bulletin 08-049-14 covered both front seats (B1096 on the right). US6252208B1 shows how a control circuit combines heating current and an NTC seat sensor; a broken element or feed simply leaves the passenger seat cold.
B0337 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of B0337
- Passenger seat heating does not warm up
- Heating switches off shortly after activation
Common causes of B0337
- Most likelyHeating wire in the passenger cushion or backrest broken
- PossibleConnector under the passenger seat kicked loose or corroded
- Less likelyDamage during work on the occupant detection mat in the same cushion
- Less likelyHeater output in the controlling module defective
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Seat heater elementSeat wiring harness
What each part of B0337 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). |
| 37 | The exact fault in that area. |
What to do next
- Note B0337 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 B0337
What does B0337 mean?
B0337 means "Passenger Seat Heater Circuit". There is no public trace of B0337 in J2012 lists or factory data; its subject repeats B0342. It is a generic code, so it means the same on every make.
Is it safe to drive with B0337?
B0337 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will B0337 fail an emissions test?
B0337 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 B0337 to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will B0337 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.