What does p0504 brake switch A/B correlation mean?

1 Answers
LaElliot
07/29/25 4:28am
p0504 brake switch A/B correlation means there is a quality issue with the brake switch itself. Possible causes include aging, poor connection, or short circuit in the brake switch circuit, or aging or overload of the electrical appliances connected to the brake switch, such as brake light bulbs. Additional information: Diagnosis and repair methods: The brake light switch is installed on the brake pedal bracket, and its signal line is directly connected to the ABS/ASC/DSC control module. Damage or abnormal signals from the brake light switch can cause the ABS/ASC/DSC control functions to fail, triggering related warning lights and reducing vehicle power performance. Common fault forms: poor circuit connection, improper adjustment of working stroke, poor contact or damage to the contact switch, etc.
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