Ford Code P204B is a diagnostic trouble code (DTC) used to detect a circuit range or performance issue in the powertrain control module (PCM). This code is set when the PCM completes a plausibility check on the reductant pressure sensor during startup after a successful purge cycle. The reductant pressure line must remain drained for the code to be set, and the code is set if the reductant pressure sensor signal exceeds 30 kPa (4.4 psi). It is essential to understand the causes and solutions of Ford Code P204B to remedy this issue.
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Causes and Solutions for Ford Code P204B
| Causes | Solutions |
|---|---|
| Faulty Reductant Pressure Sensor | Replace the sensor |
| Faulty Reductant Pressure Signal | Repair the wiring |
| Damaged Fuel System Components | Replace the damaged components |
| Faulty PCM | Replace the PCM |
Faulty Reductant Pressure Sensor
Ford Code P204B is typically caused by a faulty reductant pressure sensor, which is the most common culprit of this code. The reductant pressure sensor monitors the pressure in the reductant pressure line, and if the pressure exceeds 30 kPa (4.4 psi), the code is set. To remedy this issue, the reductant pressure sensor must be replaced.
Faulty Reductant Pressure Signal
If the reductant pressure line is not draining correctly, the reductant pressure signal sent to the PCM will be incorrect. This can cause the PCM to set Ford Code P204B. In this case, the wiring and connectors should be inspected for damage and repaired.
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Damaged Fuel System Components
If the fuel system components are damaged, they can cause the reductant pressure line to not drain properly. This can lead to the PCM setting Ford Code P204B. In this case, the damaged components should be replaced to remedy the issue.
Faulty PCM
A faulty PCM can also cause Ford Code P204B to be set. If the PCM is not functioning properly, it cannot interpret the reductant pressure signal correctly. In this case, the PCM should be replaced to remedy the issue.
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Conclusion
Ford Code P204B is a diagnostic trouble code (DTC) set when the powertrain control module (PCM) completes a plausibility check on the reductant pressure sensor during startup after a successful purge cycle. This code can be caused by a faulty reductant pressure sensor, faulty reductant pressure signal, damaged fuel system components, or a faulty PCM. To remedy the issue, the defective or damaged parts should be replaced. To avoid Ford Code P204B, it is essential to regularly inspect the Ford Code P204B system components and repair any issues.