AutoCodes – Lexus – C13B4 Lexus

C13B4 Lexus Code - Electric Parking Brake Switch Malfunction

Quick Answer

When the Electric Parking Brake (EPB) Switch is pulled, a lock request signal is sent from the Skid Control ECU (Brake Actuator Assembly) to the parking brake actuator assembly. Common causes include Faulty Electric Parking Brake Switch, Electric Parking Brake Switch harness is open or shorted, Electric Parking Brake Switch circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: C13B4 Lexus indicates Electric Parking Brake Switch Malfunction.
Common causes: Common causes include Faulty Electric Parking Brake Switch, Electric Parking Brake Switch harness is open or shorted, Electric Parking Brake Switch circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 45

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Oct 10, 2025

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code C13B4 Lexus Description

When the Electric Parking Brake (EPB) Switch is pulled, a lock request signal is sent from the Skid Control ECU (Brake Actuator Assembly) to the parking brake actuator assembly. When the electric parking brake switch is pushed, a release request signal is sent from the skid control ECU (brake actuator assembly) to the parking brake actuator assembly.

OBDII Code C13B4 Lexus - Electric Parking Brake Switch Malfunction - AutoCodes.com — C13B4 Lexus Code - Electric Parking Brake Switch Malfunction

What does this mean?

What are the Possible Causes of the DTC C13B4 Lexus?

Faulty Electric Parking Brake Switch
Electric Parking Brake Switch harness is open or shorted
Electric Parking Brake Switch circuit poor electrical connection
Faulty Skid Control ECU (Brake Actuator Assembly)

How to Fix the DTC C13B4 Lexus?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C13B4 Lexus code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the C13B4 Lexus code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.