C0271 moderate

Electronic Parking Brake Switch Circuit Malfunction

The C0271 code means the vehicle's onboard diagnostic system has detected: Electronic Parking Brake Switch Circuit Malfunction. This is a moderate severity code.

My Garage →

Keep driving?: Yes, but fix soon
DIY difficulty: moderate
Estimated cost: $50 - $300 (parts and labor)

Read ABS Codes

BlueDriver Bluetooth Pro Scanner

Basic scanners cannot read ABS codes. BlueDriver reads all systems including ABS, SRS, and transmission through your phone.

Check Price on Amazon

Affiliate link -- we earn a commission at no extra cost to you.

Read ABS Codes

LAUNCH CRP123X (Reads ABS + Chassis)

Basic scanners cannot read ABS codes. This one reads all four systems so you know exactly which sensor failed.

Check Price on Amazon

Affiliate link -- we earn a commission at no extra cost to you.

Common Symptoms

Parking brake warning light on
Parking brake button does not respond
Intermittent parking brake operation
Parking brake applies or releases on its own
Dashboard warning message for parking brake

Probable Causes (Ranked by Likelihood)

Failed parking brake switch or button Very High
Corroded switch connector or terminal High
Spilled liquid contaminating the switch Moderate
Wiring fault between switch and module Moderate
Parking brake module switch input failure Low

Step-by-Step Diagnostic Procedure

Test the parking brake switch operation using a scan tool to read switch state
Inspect the switch for physical damage or contamination
Check the switch connector for corrosion or loose pins
Test switch continuity with a multimeter
Verify wiring between switch and parking brake module for opens or shorts

Frequently Asked Questions

Can the parking brake switch be replaced separately?

Yes, in most cases. The parking brake switch is usually a standalone button or toggle located on the center console. Replacement typically involves removing a trim panel and disconnecting the connector.

Why does my parking brake engage on its own?

A faulty switch that intermittently closes can send false engagement signals to the module. Some vehicles also have an auto-apply feature that engages the parking brake when the vehicle is put in park.

Can spilled coffee damage the parking brake switch?

Yes. The parking brake switch is typically located on the center console where spills are common. Liquid can get inside the switch and cause corrosion or short circuits that affect operation.