P21AD

Reductant Level Sensor C Circuit

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$28–89 (est.)

Symptoms

Check Engine Light Is On
Reduced engine power
Increased fuel consumption
SCR System Error Message
Problems starting the engine (in some cases)

Causes

Reagent level sensor fault C
Open or short circuit in the sensor circuit
Poor contact in sensor connectors
Problems with the control unit
Sensor contamination

How to Fix

Check the integrity of the sensor circuit
Inspect the connectors and contacts of the sensor
Check the functionality of the reagent level sensor
Replace sensor if necessary
Reset the error code and check the system

Related codes

P21A9 P21AA P21AB