B0330 code meaning
HVAC Rear Blower Motor Circuit
What B0330 means
B0330 cannot be found in accessible J2012 lists or carmaker sources, and it overlaps B0184 in content. The rear blower moves conditioned air to the back rows, often as a second fan in a rear duct (US6915650B2) or a separate rear unit with its own speed control (US4949779A). GM's 2011 Saab 9-5 and 9-4X log the circuit as B0208: the climate module sends a PWM speed command to an auxiliary blower control module that converts it into 2–13 V at the motor; 01 means that line is always high, 06 always low or floating, and the rear blower stops. Typical faults are a seized motor, a burnt speed controller or a broken command wire.
B0330 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of B0330
- No air from the rear vents
- Rear blower runs only at one speed or cannot be switched off
Common causes of B0330
- Most likelyRear blower speed controller or resistor burnt out
- PossibleRear blower motor seized or brushes worn
- PossibleSpeed command wire open or shorted between modules
- Less likelyRear blower fuse or supply relay failed
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Rear blower motorRear blower resistorHvac control module
What each part of B0330 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). |
| 30 | The exact fault in that area. |
What to do next
- Note B0330 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 B0330
What does B0330 mean?
B0330 means "HVAC Rear Blower Motor Circuit". B0330 cannot be found in accessible J2012 lists or carmaker sources, and it overlaps B0184 in content. It is a generic code, so it means the same on every make.
Is it safe to drive with B0330?
B0330 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will B0330 fail an emissions test?
B0330 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 B0330 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will B0330 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.