OBD Guide
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B2516

Blower Control Circuit Failure

B2516 is an OBD-II diagnostic trouble code meaning: Blower Control Circuit Failure. Common causes: open or short circuit in wiring harness, fan relay fault. Estimated repair cost: $56–167.

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

Symptoms

  • Heater fan does not work
  • The fan only runs at one speed
  • Noise or grinding noise when the fan is running
  • Lack of airflow in the cabin

Causes

  • Open or short circuit in wiring harness
  • Fan relay fault
  • Problems with the climate control unit
  • Worn or broken heater fan
  • Corrosion of contacts or connectors

How to Fix

  1. Check fan fuse and relay
  2. Inspect the wiring harness for damage
  3. Check fan operation by applying voltage directly
  4. Diagnose the climate control control unit
  5. Replace faulty components (fan, relay, wires)

Related codes

B2515B2517B2518

FAQ

What does the B2516 code mean?

B2516 is an OBD-II diagnostic trouble code that indicates: Blower Control Circuit Failure

What causes a B2516 error code?

The most common causes of B2516 include: Open or short circuit in wiring harness; Fan relay fault; Problems with the climate control unit; Worn or broken heater fan.

How do I fix a B2516 diagnostic trouble code?

To fix B2516: Check fan fuse and relay. Inspect the wiring harness for damage. Check fan operation by applying voltage directly. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2516?

Limited driving only, diagnose soon

How much does it cost to fix B2516?

The estimated repair cost for B2516 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat