P21B0

Reductant Level Sensor C Circuit High

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$33–89 (est.)

Symptoms

Check Engine light comes on
Reduced engine power
Increased fuel consumption
Possible transition to emergency mode
SCR error message on instrument panel

Causes

Short circuit in the sensor circuit
Reductant level sensor malfunction
Wiring Harness Problems
Contact corrosion
SCR control module malfunction

How to Fix

Check the integrity of the sensor wiring harness
Check connections and contacts for corrosion
Test the reductant level sensor
Check the voltage in the circuit
Replace sensor if necessary

Related codes

P21A0 P21A1 P21B1