OBD Guide
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B10EC

Blower Motor Control Circuit Over Current

B10EC is an OBD-II diagnostic trouble code meaning: Blower Motor Control Circuit Over Current. Common causes: short circuit in control circuit, fan motor malfunction. Estimated repair cost: $33–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–167 (est.)

Symptoms

  • Heater fan does not work
  • The fan only runs at maximum speed
  • Fan fuse blows
  • Burning smell from the ventilation system

Causes

  • Short circuit in control circuit
  • Fan motor malfunction
  • Wiring harness damage
  • Faulty resistor or fan control unit
  • Corrosion of contacts or connectors

How to Fix

  1. Check fan circuit fuses
  2. Inspect the wiring harness for damage
  3. Check fan motor resistance
  4. Diagnose the operation of the fan resistor (if any)
  5. Check control signals from the climate control unit
  6. Replace faulty components

Related codes

B10EDB10EEB3933

FAQ

What does the B10EC code mean?

B10EC is an OBD-II diagnostic trouble code that indicates: Blower Motor Control Circuit Over Current

What causes a B10EC error code?

The most common causes of B10EC include: Short circuit in control circuit; Fan motor malfunction; Wiring harness damage; Faulty resistor or fan control unit.

How do I fix a B10EC diagnostic trouble code?

To fix B10EC: Check fan circuit fuses. Inspect the wiring harness for damage. Check fan motor resistance. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B10EC?

Limited driving only, diagnose soon

How much does it cost to fix B10EC?

The estimated repair cost for B10EC is $33–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat