OBD Guide
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B2563

Auxiliary Blower Motor Speed Relay 2 Circuit Short To Voltage

B2563 is an OBD-II diagnostic trouble code meaning: Auxiliary Blower Motor Speed Relay 2 Circuit Short To Voltage. Common causes: wiring harness damage, fan speed relay malfunction. Estimated repair cost: $56–167.

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

Symptoms

  • Additional fan does not work
  • Engine overheating
  • Check Engine light comes on
  • Reduced cooling system efficiency

Causes

  • Wiring harness damage
  • Fan speed relay malfunction
  • Short circuit to power in the circuit
  • Problems with the engine control unit (ECU)
  • Additional fan malfunction

How to Fix

  1. Check wiring harness for damage
  2. Check fan speed relay
  3. Check the voltage in the circuit
  4. Check the operation of the additional fan
  5. If necessary, replace faulty components
  6. Reset the error and check if it returns

Related codes

B2562B2564P0480P0481

FAQ

What does the B2563 code mean?

B2563 is an OBD-II diagnostic trouble code that indicates: Auxiliary Blower Motor Speed Relay 2 Circuit Short To Voltage

What causes a B2563 error code?

The most common causes of B2563 include: Wiring harness damage; Fan speed relay malfunction; Short circuit to power in the circuit; Problems with the engine control unit (ECU).

How do I fix a B2563 diagnostic trouble code?

To fix B2563: Check wiring harness for damage. Check fan speed relay. Check the voltage in the circuit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2563?

Limited driving only, diagnose soon

How much does it cost to fix B2563?

The estimated repair cost for B2563 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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