U0619

Lost Communication With Reductant Level Sensor A

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine light comes on
Low AdBlue message on the dashboard (even with a full tank)
Reduced engine power
Speed limit (on some models)
Inability to start the engine after several attempts

Causes

Open or short circuit in the AdBlue level sensor circuit
Malfunction of the level sensor itself
Problems with the sensor connector (oxidation, damage)
SCR control module malfunction
ECU software error

How to Fix

Check the integrity of the wiring and connectors of the AdBlue level sensor
Check the power supply and ground of the sensor
Test the level sensor (resistance, signals)
If necessary, replace the AdBlue level sensor
Reset the error and check the system
Repair only from an authorized dealer

Related codes

U0618 U0620 P20EE