AutoCodes – Generic – B2515

B2515 Code - Heater Blower Relay Circuit Failure

Quick Answer

The Body Control Module (BCM) monitors the Heater Blower Relay. Common causes include Faulty Heater Blower Relay, Heater Blower Relay harness is open or shorted, Heater Blower Relay circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B2515 indicates Heater Blower Relay Circuit Failure.
Common causes: Common causes include Faulty Heater Blower Relay, Heater Blower Relay harness is open or shorted, Heater Blower Relay circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 8,199

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Dec 17, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B2515 Description

The Body Control Module (BCM) monitors the Heater Blower Relay. The BCM sets the OBDII code when the Heater Blower Relay is not to factory specifications.

OBDII Code B2515 - Heater Blower Relay Circuit Failure - AutoCodes.com — B2515 Code - Heater Blower Relay Circuit Failure

What does this mean?

What are the Possible Causes of the DTC B2515?

Faulty Heater Blower Relay
Heater Blower Relay harness is open or shorted
Heater Blower Relay circuit poor electrical connection

How to Fix the DTC B2515?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B2515 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B2515 code?

Need more information on how to fix the B2515 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2515 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2515 Buick — Steering Wheel Controls Illegal Resistance Value
B2515 Cadillac — Steering Wheel Controls Illegal Resistance Value
B2515 Chevrolet — Steering Wheel Controls Illegal Resistance Value
B2515 Chrysler — Rear Window Position Sensor Supply Circuit Low
B2515 Dodge — Rear Window Position Sensor Supply Circuit Low
B2515 GMC — Steering Wheel Controls Illegal Resistance Value
B2515 Lexus — Open In Luggage Closer Motor Left Circuit

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B2515 Code

1. What does OBDII code B2515 mean?

B2515 indicates a failure in the heater blower relay circuit, which controls the operation of the vehicle's blower motor for the heating and air conditioning system.

2. What are the common symptoms of code B2515?

Symptoms may include the heater or AC blower motor not working, intermittent operation of the blower, or only functioning at certain speeds.

3. What causes the B2515 code to appear?

Common causes include a faulty blower motor relay, damaged wiring or connectors in the relay circuit, a defective blower motor, or issues with the HVAC control module.

4. Can I still drive my car with a B2515 code?

Yes, you can drive the car, but you may experience issues with the heating or air conditioning system, making it uncomfortable in extreme weather conditions.

5. How do I diagnose a B2515 code?

Start by inspecting the blower motor relay, wiring, and connectors for damage or loose connections. Use a multimeter to test for voltage and continuity in the circuit.

6. How do you fix a B2515 code?

Repairs may include replacing the blower motor relay, repairing or replacing damaged wiring, cleaning or securing connectors, or reprogramming the HVAC control module if necessary.

7. How much does it cost to repair a B2515 code?

Repair costs vary but typically range from $50 to $200, depending on whether the relay or wiring needs replacement and labor charges.

8. Can a blown fuse cause a B2515 code?

Yes, a blown fuse in the blower motor circuit can disrupt the relay's operation and trigger the code.

9. How can I prevent a B2515 code from recurring?

Regularly inspect the blower motor system, keep wiring and connectors clean and secure, and replace worn components promptly.

10. Do I need a professional mechanic to fix a B2515 code?

While some issues, like replacing a relay, can be done by DIYers, diagnosing wiring problems or reprogramming the HVAC module may require a professional.