Subaru P1577 Error Code: How to Fix It

Q: What causes Subaru P1577 error code?

P1577 is typically caused by a faulty brake pedal position switch, damaged wiring to the switch, loose electrical connections, or improper switch adjustment. The brake switch may fail due to normal wear, exposure to moisture, or electrical issues.

Q: Can I drive my Subaru with P1577 code?

While you can typically drive with P1577, your cruise control likely won't work and you may experience transmission shifting issues. The brake lights should still function through a separate circuit. Have it diagnosed and repaired promptly for safety and proper vehicle operation.

Q: How much does it cost to fix Subaru P1577?

A brake pedal position switch typically costs $20-60, and labor is usually 0.5-1 hour ($50-150). Total repair cost is generally $70-210 depending on your location and whether additional wiring work is needed.

Q: Will P1577 cause my Subaru to fail inspection?

P1577 may cause inspection failure in areas that check for active diagnostic trouble codes. However, since brake lights typically still work through a separate circuit, basic safety functions remain operational during the repair period.

Q: How do I prevent P1577 from happening again?

Keep the brake pedal area clean and free of debris, avoid spilling liquids near the pedals, and have brake system maintenance performed regularly. The brake switch is a wear item that may need replacement every 5-10 years depending on usage.

Abstract

The Subaru P1577 error code indicates a brake switch circuit low input, meaning the brake pedal position switch is not sending the proper signal to the engine control module. This can cause issues with cruise control, transmission shifting, and engine performance.