OBD Guide
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B2515

Heater Blower Relay Circuit Failure

B2515 is an OBD-II diagnostic trouble code meaning: Heater Blower Relay Circuit Failure. Common causes: fan relay failure, blown circuit fuse. Estimated repair cost: $22–111.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$22–111 (est.)

Symptoms

  • Heater fan not working
  • Fan only runs at certain speeds
  • Increased noise during fan operation
  • Triggering of the heating system lamp test (CLIMAT) on the dashboard

Causes

  • Fan relay failure
  • Blown circuit fuse
  • Open or short circuit in wiring harness
  • Problems with contacts in connectors
  • Malfunction of the climate control unit

How to Fix

  1. Check the condition of the fan circuit fuse
  2. Diagnose the fan relay (or replace it with a known good one)
  3. Check the integrity of the wiring harness
  4. Clean and check contacts in connectors
  5. Check the functionality of the climate control unit

Related codes

B2510B2516B2520

FAQ

What does the B2515 code mean?

B2515 is an OBD-II diagnostic trouble code that indicates: Heater Blower Relay Circuit Failure

What causes a B2515 error code?

The most common causes of B2515 include: Fan relay failure; Blown circuit fuse; Open or short circuit in wiring harness; Problems with contacts in connectors.

How do I fix a B2515 diagnostic trouble code?

To fix B2515: Check the condition of the fan circuit fuse. Diagnose the fan relay (or replace it with a known good one). Check the integrity of the wiring harness. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2515?

Do not drive — repair immediately

How much does it cost to fix B2515?

The estimated repair cost for B2515 is $22–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat