C0138

Base Brake System Pressure Circuit/Sensor Low

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

The brake system fault indicator is on
Deterioration of ABS and ESP performance
Unusual behavior of the brake pedal

Causes

Brake pressure sensor malfunction
Wiring harness damage
Short circuit in the circuit
Sensor connection problems
Brake ECU malfunction

How to Fix

Check the connection of the pressure sensor and the condition of the connector
Check the integrity of the wiring harness
Check resistance and voltage at pressure sensor
If necessary, replace the pressure sensor
Check the operation of the brake system after repair

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