Chevrolet Code P21AB is an engine code that indicates a problem with the Reductant Level Sensor 2 Circuit High Voltage. It is a code that can cause a variety of issues with your engine, ranging from misfires and poor fuel economy to poor acceleration and the engine running rough. In order to diagnose and repair this code, it is important to understand the underlying causes and possible solutions. This article will provide a comprehensive overview of the Chevrolet Code P21AB and outline its causes and solutions. By understanding the causes and solutions of this code, you can ensure that your engine runs smoothly and efficiently.
Causes and Solutions of Chevrolet Code P21AB
| Cause | Solution |
|---|---|
| P203D, P21AB, and P21B0 | Check the ECM for a serial data message from the reductant sensor module |
| Open circuit in level sensor 1, 2 or 3 | Replace the emission reduction fluid tank level sensor 1, 2 or 3 |
| Short to voltage in level sensor 1, 2 or 3 | Check the wiring, connectors, and emission reduction fluid tank level sensor 1, 2 or 3 for a short to voltage |
| Related Service Bulletins | Refer to related Service Bulletins 12-06-04-002D, 12-06-04-002E, PIP4887A, and PIP4887B |
P203D, P21AB, and P21B0
The first cause of Chevrolet Code P21AB is P203D, P21AB, or P21B0. These codes all indicate a problem with the reductant level sensor 2 circuit high voltage. This can be caused by an open circuit in the level sensor or a short to voltage in the sensor. To diagnose this issue, it is important to check the ECM for a serial data message from the reductant sensor module.
Open Circuit in Level Sensor 1, 2, or 3
The second cause of Chevrolet Code P21AB is an open circuit in level sensor 1, 2, or 3. This can be caused by faulty wiring, connectors, or the sensor itself. To diagnose this issue, it is important to check the wiring, connectors, and sensor for an open circuit. If the open circuit is found, it is important to replace the emission reduction fluid tank level sensor 1, 2, or 3.
Short to Voltage in Level Sensor 1, 2, or 3
The third cause of Chevrolet Code P21AB is a short to voltage in level sensor 1, 2, or 3. This can be caused by faulty wiring, connectors, or the sensor itself. To diagnose this issue, it is important to check the wiring, connectors, and sensor for a short to voltage. If the short is found, it is important to replace the emission reduction fluid tank level sensor 1, 2, or 3.
The fourth cause of Chevrolet Code P21AB is related Service Bulletins. These bulletins include 12-06-04-002D, 12-06-04-002E, PIP4887A, and PIP4887B. These bulletins provide detailed information on how to diagnose and repair the issue. It is important to read and understand these bulletins in order to properly diagnose and repair the issue.
Conclusion
Chevrolet Code P21AB is a code that can cause a variety of issues with your engine. In order to diagnose and repair this code, it is important to understand the underlying causes and possible solutions. This article provided a comprehensive overview of the Chevrolet Code P21AB and outlined its causes and solutions. By understanding the causes and solutions of Chevrolet Code P21AB, you can ensure that your engine runs smoothly and efficiently.
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