P0571 meaning: Brake Switch A Circuit Explained
Understand P0571 meaning, common causes, DIY checks, and when to consult a specialist for brake switch circuit faults.
P0571 meaning
P0571 meaning refers to a fault in the brake switch A circuit detected by the vehicle's control module.
At a glance
| Severity | Can you keep driving? | DIY difficulty | Typical fix path |
|---|---|---|---|
| moderate — fix soon | short trips only | varies | inspect switch and wiring |
What P0571 means
The P0571 code signals an abnormal voltage reading from the brake light switch circuit, often preventing proper brake light activation.
Common causes of P0571
- Faulty brake light switch
- Damaged wiring harness near the switch
- Corroded or loose electrical connectors
- Blown fuse in the brake light circuit
- Malfunctioning body control module (less common)
What shows on a live scan
During a live scan, P0571 appears alongside related PIDs such as P0461 meaning: Fuel Level Sensor A Circuit Range/Performance Explained · OBD2 Online and may trigger brake light warnings without immediate drivability issues.
DIY checks for P0571
Test brake lights manually by pressing the pedal; inspect switch mounting and wiring for visible damage; verify fuse integrity using the owner's manual. If symptoms persist, a verified specialist can provide targeted guidance.
When to see a specialist
Seek professional help if brake lights fail to illuminate, the code persists after DIY inspection, or multiple related codes appear, indicating potential module or network issues.
FAQ
What does P0571 mean?
P0571 meaning indicates a problem with the brake switch A circuit, often causing brake lights to fail or not activate properly.
Can I keep driving with P0571?
You can usually drive short distances but should avoid night driving or heavy traffic until the issue is resolved to ensure safety.
How much does it cost to fix P0571?
Repair costs vary based on vehicle make and labor rates; expect a range that typically starts around $100 but may increase for complex wiring work.
Can I fix P0571 myself?
Basic checks like fuse replacement or switch adjustment are DIY-friendly, but wiring repairs or module diagnostics often require professional tools and expertise.
Talk to a specialist today to resolve P0571 safely and confidently. Cars specialists