AutoCodes – Generic – B2815

B2815 Code - Steering Wheel Controls Illegal Resistance Value

Quick Answer

The Steering Wheel Controls are momentary contact switches that connect a series of resistors so that each switch selection corresponds to a fixed resistance value. Common causes include Faulty Steering Wheel Control (SWC) Switch, Steering Wheel Control (SWC) Switch harness is open or shorted, Steering Wheel Control (SWC) Switch 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: B2815 indicates Steering Wheel Controls Illegal Resistance Value.
Common causes: Common causes include Faulty Steering Wheel Control (SWC) Switch, Steering Wheel Control (SWC) Switch harness is open or shorted, Steering Wheel Control (SWC) Switch 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.

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Code Popularity 3,230

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 Feb 13, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2815 Description

The Steering Wheel Controls are momentary contact switches that connect a series of resistors so that each switch selection corresponds to a fixed resistance value. The Body Control Module (BCM) determines which switch has been pressed by the voltage drop across the corresponding resistance value. The BCM supplies voltage to the steering wheel controls through the rear wiper/washer switch supply voltage circuit. The BCM monitors the switch voltage on the remote radio control signal circuit. The Diagnostic Trouble Code (DTC) sets when the BCM detects a switch voltage that is higher than normal.

OBDII Code B2815 - Steering Wheel Controls Illegal Resistance Value - AutoCodes.com — B2815 Code - Steering Wheel Controls Illegal Resistance Value

What does this mean?

What are the Possible Causes of the DTC B2815?

Faulty Steering Wheel Control (SWC) Switch
Steering Wheel Control (SWC) Switch harness is open or shorted
Steering Wheel Control (SWC) Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B2815?

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 B2815 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 B2815 code?

Need more information on how to fix the B2815 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2815 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2815 Buick — Steering Wheel Controls Illegal Resistance Value
B2815 Cadillac — Steering Wheel Controls Illegal Resistance Value
B2815 Chevrolet — Steering Wheel Controls Illegal Resistance Value
B2815 GMC — Steering Wheel Controls Illegal Resistance Value
B2815 Subaru — Power Supply Low Voltage

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 B2815 Code

1. What are the common symptoms of OBDII code B2815 (Steering Wheel Controls Illegal Resistance Value)?

- Common symptoms include inoperative steering wheel controls, malfunctioning audio or cruise control buttons, and an illuminated warning light on the dashboard.

2. What causes the OBDII code B2815 to be triggered?

- This code is triggered when the resistance value detected by the steering wheel control module is outside the acceptable range, often due to a faulty wiring connection or a defective component in the steering wheel controls.

3. How can I diagnose the issue causing OBDII code B2815?

- Diagnosing the issue involves checking the wiring connections to the steering wheel controls, testing the resistance values of the components, and inspecting for any signs of physical damage or wear.

4. Can a DIY enthusiast repair OBDII code B2815 at home?

- While some basic troubleshooting steps can be performed at home, repairing OBDII code B2815 often requires specialized tools and expertise. It is recommended to consult a professional mechanic for accurate diagnosis and repair.

5. Is it safe to continue driving with OBDII code B2815 present?

- It is not recommended to continue driving with this code present, as it may indicate a potential safety issue with the steering wheel controls. Prompt diagnosis and repair are advised to ensure safe operation of the vehicle.

6. What are the typical repair options for resolving OBDII code B2815?

- Repair options may include repairing or replacing faulty wiring connections, replacing defective components in the steering wheel controls, or resetting the control module after addressing the root cause of the issue.

7. Can environmental factors contribute to triggering OBDII code B2815?

- Extreme temperatures or moisture exposure can sometimes lead to erratic resistance values in the steering wheel controls, potentially triggering OBDII code B2815. Proper insulation and protection can help prevent such issues.

8. Are there any software updates or recalibrations that can resolve OBDII code B2815?

- In some cases, performing a software update or recalibrating the steering wheel control module may help resolve OBDII code B2815. Consult the vehicle manufacturer's technical service bulletins for specific guidance.

9. How can I prevent OBDII code B2815 from recurring in the future?

- Regularly inspecting and maintaining the steering wheel controls, ensuring proper wiring connections, and avoiding exposure to harsh environmental conditions can help prevent the recurrence of OBDII code B2815.

10. Can OBDII code B2815 affect other vehicle systems or components?

- While OBDII code B2815 specifically relates to the steering wheel controls, it is essential to address this issue promptly as it may impact the functionality of other related systems such as the audio system or cruise control.