OBD Guide
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B10B9

Blower Control No Sub Type Information

B10B9 is an OBD-II diagnostic trouble code meaning: Blower Control No Sub Type Information. Common causes: open or short circuit in wiring harness, fan solenoid valve malfunction. Estimated repair cost: $33–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$33–167 (est.)

Symptoms

  • Heater fan does not work
  • The fan only runs at one speed
  • Dashboard warning light activated

Causes

  • Open or short circuit in wiring harness
  • Fan solenoid valve malfunction
  • Problems with the climate control module
  • Contact corrosion
  • Software glitch

How to Fix

  1. Check wiring harness for damage
  2. Check resistance and voltage at solenoid valve
  3. Scan the control module for errors
  4. Clean contacts and connectors
  5. If necessary, replace faulty components

Related codes

B10B8B10BAB10BB

FAQ

What does the B10B9 code mean?

B10B9 is an OBD-II diagnostic trouble code that indicates: Blower Control No Sub Type Information

What causes a B10B9 error code?

The most common causes of B10B9 include: Open or short circuit in wiring harness; Fan solenoid valve malfunction; Problems with the climate control module; Contact corrosion.

How do I fix a B10B9 diagnostic trouble code?

To fix B10B9: Check wiring harness for damage. Check resistance and voltage at solenoid valve. Scan the control module for errors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B10B9?

Yes, but get it checked soon

How much does it cost to fix B10B9?

The estimated repair cost for B10B9 is $33–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat