P21B0
Reductant Level Sensor C Circuit High
P21B0 is an OBD-II diagnostic trouble code meaning: Reductant Level Sensor C Circuit High. Common causes: short circuit in the sensor circuit, reductant level sensor malfunction. Estimated repair cost: $33–89.
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
Error P21B0 by Vehicle Brand
FAQ
What does the P21B0 code mean?
P21B0 is an OBD-II diagnostic trouble code that indicates: Reductant Level Sensor C Circuit High
What causes a P21B0 error code?
The most common causes of P21B0 include: Short circuit in the sensor circuit; Reductant level sensor malfunction; Wiring Harness Problems; Contact corrosion.
How do I fix a P21B0 diagnostic trouble code?
To fix P21B0: Check the integrity of the sensor wiring harness. Check connections and contacts for corrosion. Test the reductant level sensor. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P21B0?
Yes, but get it checked soon
How much does it cost to fix P21B0?
The estimated repair cost for P21B0 is $33–89. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat