B0170 code meaning
HVAC Mode Door Position Sensor
What B0170 means
Searching the available J2012 lists and public manufacturer material turned up no entry for B0170 with this title. Unlike B0150, which concerns how the mode door moves, this code points at the sensor that reports its position. In most electronic climate actuators that sensor is a potentiometer on the gear train; a Motor magazine article puts its signal at about 0 to 5 V and notes that simple recirculation actuators often have none. Hyundai's patent US9960727B2 drives intake, temperature, mode and defog door motors until the feedback voltage matches the target and watches the motor current for stalls. A lost or noisy position signal leaves the module unsure where the door is, so it may stop driving it.
B0170 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of B0170
- Air distribution stays fixed in one position
- Actuator runs repeatedly or ticks after switching on
Common causes of B0170
- Most likelyWorn or dirty potentiometer track inside the mode actuator
- PossibleFeedback signal, 5 V supply or reference wire open or shorted
- Less likelyBent or pushed-back pin in the actuator connector
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Mode door position sensorMode door actuatorHvac control module
What each part of B0170 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). |
| 70 | The exact fault in that area. |
What to do next
- Note B0170 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 B0170
What does B0170 mean?
B0170 means "HVAC Mode Door Position Sensor". Searching the available J2012 lists and public manufacturer material turned up no entry for B0170 with this title. It is a generic code, so it means the same on every make.
Is it safe to drive with B0170?
B0170 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will B0170 fail an emissions test?
B0170 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 B0170 to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will B0170 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.