Blower Motor Thermal Protection
The B0869 code means the vehicle's onboard diagnostic system has detected: Blower Motor Thermal Protection. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- easy
- Estimated cost
- $80 - $400 (parts and labor)
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Common Symptoms
- No air blows from vents
- Blower only works on highest speed
- Blower motor makes noise
- Fan speed does not change
Probable Causes (Ranked by Likelihood)
- Faulty blower motor Very High
- Failed blower motor resistor or controller High
- Blown blower motor fuse Moderate
- Damaged blower wiring Low
Step-by-Step Diagnostic Procedure
-
Check blower motor fuse and relay
-
Test blower motor with direct 12V power
-
Measure blower resistor resistance values
-
Inspect blower motor connector for melting
Frequently Asked Questions
Why does my blower only work on high?
The blower motor resistor or electronic controller has failed, which controls lower fan speeds. High speed bypasses the resistor.
Why does my blower motor squeal?
A worn blower motor bearing causes squealing. The motor needs replacement as bearings are not separately serviceable.
Where is the blower motor located?
Typically behind the glove box or under the dashboard on the passenger side.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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