OBD Guide
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B2564

Auxiliary Blower Motor Speed Relay 2 Circuit Open/Short To Ground

B2564 is an OBD-II diagnostic trouble code meaning: Auxiliary Blower Motor Speed Relay 2 Circuit Open/Short To Ground. Common causes: broken wiring in the relay circuit, short circuit to ground. Estimated repair cost: $56–167.

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

Symptoms

  • Engine overheating when the air conditioner is running
  • Auxiliary fan does not turn on
  • Check Engine Light Is On

Causes

  • Broken wiring in the relay circuit
  • Short circuit to ground
  • Fan relay fault
  • Problems with the engine control unit (ECU)

How to Fix

  1. Check the fan circuit fuse
  2. Inspect the wiring for damage
  3. Check fan relay operation
  4. Test the fan itself
  5. Scan the control unit for other errors

Related codes

B2563B2565P0480

FAQ

What does the B2564 code mean?

B2564 is an OBD-II diagnostic trouble code that indicates: Auxiliary Blower Motor Speed Relay 2 Circuit Open/Short To Ground

What causes a B2564 error code?

The most common causes of B2564 include: Broken wiring in the relay circuit; Short circuit to ground; Fan relay fault; Problems with the engine control unit (ECU).

How do I fix a B2564 diagnostic trouble code?

To fix B2564: Check the fan circuit fuse. Inspect the wiring for damage. Check fan relay operation. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2564?

Limited driving only, diagnose soon

How much does it cost to fix B2564?

The estimated repair cost for B2564 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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