When you own a Ford and the check engine light is on in your dashboard, it could be caused by the Ford P21AB Code. This code indicates that the powertrain control module (PCM) has detected an issue with the reductant level sensor circuits. This code is most commonly associated with the reductant level sensor B circuit, which is responsible for monitoring the voltage levels to the PCM. If the voltage exceeds or falls below a calibrated limit, the test will fail and the Ford P21AB Code will be triggered. In order to diagnose the problem and reset the code, it is best to be aware of the potential causes and solutions.
Causes and Solutions of Ford P21AB Code
| Causes | Solutions |
|---|---|
| Low reductant fluid level | Check reductant fluid level and refill if necessary |
| Defective reductant level sensor | Replace reductant level sensor |
| Defective wiring | Repair or replace the wiring as necessary |
| Damaged powertrain control module | Replace the powertrain control module |
Low Reductant Fluid Level
The first cause of a Ford P21AB Code is a low reductant fluid level. This can happen when the vehicle has gone a long time without being serviced or when the reductant fluid has leaked out. This can cause the powertrain control module to detect an issue with the voltage levels and trigger the code. The solution for this is to check the reductant fluid level and refill it as necessary.
Defective Reductant Level Sensor
The second cause of a Ford P21AB Code is a defective reductant level sensor. This can cause the powertrain control module to detect an issue with the voltage levels and trigger the code. The solution for this is to replace the reductant level sensor to solve the issue.
Defective Wiring
The third cause of a Ford P21AB Code is defective wiring. This can cause the powertrain control module to detect an issue with the voltage levels and trigger the code. The solution for this is to repair or replace the wiring as necessary to restore normal operation.
Damaged Powertrain Control Module
The fourth cause of a Ford P21AB Code is a damaged powertrain control module. This can cause the powertrain control module to detect an issue with the voltage levels and trigger the code. The solution for this is to replace the powertrain control module to solve the issue.
Conclusion
When the check engine light of a Ford is on, the cause may be the Ford P21AB Code. This code is associated with the reductant level sensor B circuit and indicates an issue with the voltage levels to the powertrain control module. To diagnose the problem and reset the code, it is best to be aware of the potential causes, such as a low reductant fluid level, a defective reductant level sensor, defective wiring, or a damaged powertrain control module. By understanding these causes and solutions, you can properly diagnose and repair the Ford P21AB Code issue.
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