P21AE

Reductant Level Sensor C Circuit Range/Performance

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$28–89 (est.)

Symptoms

Check Engine light comes on
Reduced engine power
A message appears indicating that the reductant level is low
Increased fuel consumption
Problems starting the engine

Causes

Reductant level sensor malfunction
Open or short circuit in the sensor circuit
Poor contact in the sensor connector
Control unit software error
Sensor contamination

How to Fix

Check the level of the reductant in the tank
Inspect the sensor circuit for damage
Check the contacts in the sensor connector
Test the sensor using diagnostic equipment
Replace the reductant level sensor if necessary

Related codes

P21AA P21AB P21AD