The Lemon IndexThe two brake pedal switch signals disagree.
Get it fixed soon. A few more days of normal driving is usually OK, but waiting can turn a small repair into a bigger one or a breakdown.
Failed brake light switch. Then: wiring fault.
Owners named P0504 in 9 complaints to the U.S. government, most often on the Hyundai Sonata.
Cars owners report it on
Complaints that name P0504, by model. Raw counts, not a failure rate: popular models get more complaints.
Years owners report it on most: 2007 Hyundai Santa Fe · 2006 Hyundai Sonata
The details
What P0504 means
The two brake pedal switch signals disagree. Cruise control may stop working and brake lights may act up.
Can I drive with P0504?
Get it fixed soon. A few more days of normal driving is usually OK, but waiting can turn a small repair into a bigger one or a breakdown.
100% of the owner complaints that name P0504 also say the car brakes or ABS act up. A complaint can describe more than one problem, so this doesn't prove the code caused it.
Common causes of P0504
- Failed brake light switch
- Wiring fault
A shop should confirm the cause with a scan and tests before replacing parts.
What owners describe
- Brakes or ABS act up: 100% of complaints
Share of complaints naming the code whose text also mentions each problem.
Model years that report P0504 most
2007 Hyundai Santa Fe (3), 2006 Hyundai Sonata (2).
Related codes
P0505 P0506 P0507 P0500 P050A P050B P050D P0513
Quick answers
What does P0504 mean?
Brake Switch A/B Correlation. The two brake pedal switch signals disagree. Cruise control may stop working and brake lights may act up.
Can I drive with P0504?
Get it fixed soon. A few more days of normal driving is usually OK, but waiting can turn a small repair into a bigger one or a breakdown.
What causes P0504?
Failed brake light switch; Wiring fault.
Counts: NHTSA owner complaints whose text names P0504. A complaint is an owner's report, not a diagnosis. Meanings: the standard SAE J2012 definitions in our own words; manufacturer codes only where verified for that make. General information, not repair advice for your car.