Toyota Error Code P1520: How to Fix It
Medium 30-60 minutes Medium Severity
Verified June 2026
- Error Code
- P1520
- Brand
- Toyota
- Product Type
- automotive
- Severity
- Medium
- DIY Difficulty
- Medium
- Estimated Fix Time
- 30-60 minutes
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Tools You'll Need
- OBD2 scanner
- Multimeter
- Basic hand tools
- Electrical contact cleaner
How to Fix Error Code P1520
-
Scan for Additional Codes
Ensure the vehicle is parked on level ground with parking brake engaged before starting diagnostics. -
Check Brake Light Operation
-
Locate the Brake Light Switch
Disconnect the negative battery terminal before working on electrical components to prevent short circuits. -
Inspect Electrical Connections
-
Test the Brake Light Switch
-
Adjust or Replace Switch
Follow manufacturer torque specifications when installing the new switch to prevent damage. -
Clear Codes and Test
Parts You May Need
Brake light switch
Check Price on Amazon
Electrical contact cleaner
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Brake light switch
Check Price on Amazon
Electrical contact cleaner
Check Price on Amazon
Brake light switch
Check Price on Amazon
Electrical contact cleaner
Check Price on Amazon
Brake light switch
Check Price on Amazon
Electrical contact cleaner
Check Price on Amazon
Brake light switch
Check Price on Amazon
Electrical contact cleaner
Check Price on Amazon
Brake light switch
Check Price on Amazon
Electrical contact cleaner
Check Price on Amazon
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When to Call a Professional
Call a qualified mechanic if you're uncomfortable working with electrical systems, if multiple brake system codes appear, or if the problem persists after replacing the switch. Professional diagnosis may be needed for complex wiring issues.Frequently Asked Questions
Can I still drive with Toyota error code P1520?
You can drive with P1520, but your cruise control may not work and transmission shifting could be affected. Fix the issue promptly to restore full vehicle functionality.
How much does it cost to fix Toyota P1520?
A brake light switch typically costs $20-50, and labor is usually 30-60 minutes. Total repair cost ranges from $80-150 at most shops.
Will P1520 cause my Toyota to fail inspection?
P1520 may cause inspection failure depending on local regulations. The malfunctioning brake light switch can affect safety systems, so repair it before inspection.
What causes Toyota P1520 error code?
P1520 is typically caused by a faulty brake light switch, loose electrical connections, damaged wiring, or incorrect switch adjustment after brake pedal service.