P21AD
Reductant Level Sensor C Circuit
P21AD is an OBD-II diagnostic trouble code meaning: Reductant Level Sensor C Circuit. Common causes: reagent level sensor fault c, open or short circuit in the sensor circuit. Estimated repair cost: $28–89.
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
Error P21AD by Vehicle Brand
FAQ
What does the P21AD code mean?
P21AD is an OBD-II diagnostic trouble code that indicates: Reductant Level Sensor C Circuit
What causes a P21AD error code?
The most common causes of P21AD include: Reagent level sensor fault C; Open or short circuit in the sensor circuit; Poor contact in sensor connectors; Problems with the control unit.
How do I fix a P21AD diagnostic trouble code?
To fix P21AD: Check the integrity of the sensor circuit. Inspect the connectors and contacts of the sensor. Check the functionality of the reagent level sensor. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P21AD?
Yes, but get it checked soon
How much does it cost to fix P21AD?
The estimated repair cost for P21AD is $28–89. Actual cost depends on your vehicle, location, and labor rates.
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