P21C6
Reductant Level Sensor B Stuck
P21C6 is an OBD-II diagnostic trouble code meaning: Reductant Level Sensor B Stuck. Common causes: level sensor float jammed, mechanical damage to the sensor. Estimated repair cost: $39–133.
Symptoms
- Check Engine Light
- Low AdBlue message on the dashboard
- Engine power limitation
- Incorrect reagent level readings
- Inability to refill the AdBlue system
Causes
- Level sensor float jammed
- Mechanical damage to the sensor
- Sensor contamination with urea crystals
- Open or short circuit in the sensor circuit
- Level sensor module malfunction
How to Fix
- Visual inspection of the level sensor for mechanical damage
- Cleaning the sensor and tank from crystallized urea
- Checking the sensor electrical circuit for opens and short circuits
- Replacing the reagent level sensor
- Resetting the error and testing the system
Related codes
Error P21C6 by Vehicle Brand
FAQ
What does the P21C6 code mean?
P21C6 is an OBD-II diagnostic trouble code that indicates: Reductant Level Sensor B Stuck
What causes a P21C6 error code?
The most common causes of P21C6 include: Level sensor float jammed; Mechanical damage to the sensor; Sensor contamination with urea crystals; Open or short circuit in the sensor circuit.
How do I fix a P21C6 diagnostic trouble code?
To fix P21C6: Visual inspection of the level sensor for mechanical damage. Cleaning the sensor and tank from crystallized urea. Checking the sensor electrical circuit for opens and short circuits. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P21C6?
Yes, but get it checked soon
How much does it cost to fix P21C6?
The estimated repair cost for P21C6 is $39–133. Actual cost depends on your vehicle, location, and labor rates.
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