OBD Guide
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B105A

Cabin Temperature Sensor Fan Circuit Short

B105A is an OBD-II diagnostic trouble code meaning: Cabin Temperature Sensor Fan Circuit Short. Common causes: short circuit in wiring harness, temperature sensor fan fault. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Incorrect operation of climate control
  • Lack of automatic temperature control in the cabin
  • Constant air temperature regardless of settings
  • Check Engine Light Illuminates

Causes

  • Short circuit in wiring harness
  • Temperature sensor fan fault
  • Damage to the interior temperature sensor
  • Corrosion or oxidation of contacts
  • Problems with the climate control unit

How to Fix

  1. Check wiring harness for damage
  2. Check the condition of the temperature sensor fan
  3. Diagnose the interior temperature sensor
  4. Clean or replace oxidized contacts
  5. Check the climate control control unit
  6. Replace faulty components

Related codes

B105BB105CB105D

FAQ

What does the B105A code mean?

B105A is an OBD-II diagnostic trouble code that indicates: Cabin Temperature Sensor Fan Circuit Short

What causes a B105A error code?

The most common causes of B105A include: Short circuit in wiring harness; Temperature sensor fan fault; Damage to the interior temperature sensor; Corrosion or oxidation of contacts.

How do I fix a B105A diagnostic trouble code?

To fix B105A: Check wiring harness for damage. Check the condition of the temperature sensor fan. Diagnose the interior temperature sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B105A?

Limited driving only, diagnose soon

How much does it cost to fix B105A?

The estimated repair cost for B105A is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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