C0640

Brake Pressure Sensor J Range/Performance

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

ABS/ESP indicator is on
Reduced braking performance
Disabling the ESP system
Unstable operation of the brake system

Causes

Brake pressure sensor fault J
Open or short circuit in wiring harness
Poor contact in the sensor connector
Problems with the ABS/ESP control unit
Sensor dirty or corroded

How to Fix

Check the integrity of the sensor wiring harness
Check the contacts in the sensor connector
Measure the resistance and voltage of the sensor
Check the pressure in the brake system
Replace brake pressure sensor J if necessary
Test the system after repair

Related codes

C0635 C0636 C0637 C0638 C0639