P0504 Hyundai Code - Brake Switch 'A' / 'B' Correlation
Quick Answer
In addition to turning on the stop lamp, the stop lamp switch signals are used for a variety of engine, transmission, and suspension functions as well as being an input for diagnostic checks. Common causes include Faulty Brake Lamp Switch, Blown Brake Lamp Bulb, Blown Brake Lamp Fuse. 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
- P0504 Hyundai indicates Brake Switch 'A' / 'B' Correlation.
- Common causes
- Common causes include Faulty Brake Lamp Switch, Blown Brake Lamp Bulb, Blown Brake Lamp Fuse.
- 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.
Code P0504 Hyundai Description
The Engine Control Module (ECM) analyzes these signal outputs to detect malfunctions in the stop lamp switch.
What are the Possible Causes of the DTC P0504 Hyundai?
- Faulty Brake Lamp Switch
- Blown Brake Lamp Bulb
- Blown Brake Lamp Fuse
- Brake Lamp Switch harness open or shorted
- Brake Lamp Switch circuit poor electrical connection
How to Fix the DTC P0504 Hyundai?
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 P0504 Hyundai 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.
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Frequently Asked Questions about P0504 Hyundai Code
1. What does the OBDII code P0504 mean on a Hyundai?
P0504 indicates a correlation issue between the two circuits of the brake switch ('A' and 'B'), meaning their signals do not match as expected.
2. What are the common symptoms of a P0504 code in a Hyundai?
Symptoms may include the brake lights not functioning properly, the ABS or ESC light turning on, cruise control not working, or difficulty shifting out of park.
3. What causes the P0504 code to appear?
The code can be caused by a faulty brake light switch, damaged wiring or connectors, a blown fuse, or misaligned brake pedal components.
4. Can I drive my Hyundai with a P0504 code?
While the vehicle may still be drivable, safety features like brake lights and ABS could be compromised, so it’s best to address the issue promptly.
5. How is the P0504 code diagnosed?
A technician will inspect the brake switch, test its circuits with a multimeter, check for blown fuses, and look for damaged wiring or loose connections.
6. How do I fix a P0504 code on a Hyundai?
Common fixes include replacing the brake light switch, repairing or replacing damaged wiring, securing loose connectors, or replacing a blown fuse.
7. How much does it cost to repair the P0504 code on a Hyundai?
Repair costs typically range from $50 to $200, depending on whether just the brake switch or additional wiring repairs are needed.
8. Can a dirty brake pedal mechanism cause a P0504 code?
Yes, dirt or debris can interfere with the proper operation of the brake switch, leading to signal mismatches and triggering the code.
9. Will clearing the P0504 code fix the issue?
Clearing the code without repairing the root cause will only temporarily turn off the warning light, and the code is likely to return.
10. Can a failing brake light switch cause cruise control to stop working?
Yes, since the brake light switch is linked to the cruise control system, a malfunction can disable cruise control and trigger the P0504 code.
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