Guide To P209C OBD Error Code Solutions

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The trouble code P209C can be explicated as Reductant Injection Air Pressure Sensor B Circuit Low. If the engine control module would

detect a variation in the voltage coming from the Reductant Injector Air Pressure Sensor delivered performance that is outside the parameters set by the automobile manufacturer, then it would store the P209C fault code. This would give rise to the flashing up of the check engine light.

Do you want to gain some more knowledge about the P209C trouble code? This diagnostic fault code is a generic powertrain code, which means that it would apply to the OBD-II equipped vehicles. The specific repair steps can vary as it depends upon the vehicle make and model. The engine control module, powertrain control module or the transmission control module monitors this circuit depending upon the particular automobile. The sensors in the exhaust system are used by the reductant injector air pressure sensor to input voltage readings to the PCM. These readings of the voltage would be recognized by the PCM as exhaust gas temperature or pressure.

What causes this problem with the Reductant Injection Air Pressure Sensor B Circuit Low?

• The reductant air pressure sensor (B) might be flawed
• There might be opened or tiny circuits in the reductant injection air pressure sensor system
• Malfunctioning SCR controller/PCM or programming error

1. Engine Control Module - Want to know the most common reason behind the failure in the engine control module? Corrosion or damage because of moisture can cause ECM failure. Corrosion might enter the ECM through the wiring harness and moisture can enter by a failure in the seals in the ECM itself.
2. Exhaust Gas Recirculation Valve - Did you just see check engine light flashing on your dashboard? If the computer would detect some fault with the automobile’s EGR valve circuit, then it would set up the check engine light so that the driver is notified about the fault. Don’t waste time and get them replaced or else this fault code can turn up.
3. Diesel Exhaust Fluid Pump - The diesel exhaust fluid pump needs to work properly if the transmission system has to perform. If it is not functioning, the transmission may slip and cause harsh shifts too. Thus replace faulty pump now and buy a new one from us!
4. Powertrain Control Module - The PCM makes the engine and transmission work in tandem. Any issue with the powertrain control module will cause major problems with the efficient running of the vehicle.
5. Engine Wiring Harness - Your car ECM would not operate properly if there are some cracks or break in the engine wiring harness. Corrosion as well as physical damage are the most common reasons why you should replace an engine wiring harness. Purchase high grade engine wiring harness online from Parts Avatar Canada.
6. Automatic Transmission Module – Faulty transmission module can cause problematic down shifts and upshifts, leading to stalling while accelerating or slowing down. This can also hamper many transmission system parts. Thus replace it now!
7. Electronic Control Unit - If your vehicle fails to start for no apparent reason, this is also a good indicator that there can be some issues with the ECU. If you check the car battery, starter and other common electrical components, and the vehicle still does not start, a quirky electronic control unit should be the next logical thing to consider.
8. Diagnostic Tool - In order to fix these errors, you need few diagnostic tools to get your car problems pointed out easily. Our diagnostic tools collection will come handy to do so and resolve all your vehicle problems. Visit today!

It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P209C here:

Common Symptoms

• Check engine light might come into signal
• Diminishing fuel efficiency
• A lot of black smoke might start emitting from the automobile’s exhaust
• Declining engine performance
• Other SCR related codes might be stored

The repairs which you will have to do to correct this fault code are simply straightforward; you can surely pinpoint the necessary repairs on the basis of your diagnosis. Have a look at some common fixes:

• Repair or replace the quirky PCM/ECM
• Rehabilitate the defaults in the reductant air pressure sensor (B) circuit
• The malfunctioning electronic control unit should be repaired or replaced as per the need
• Carefully adjust the faults in the reductant air pressure sensor (B)
• Recondition the non-functioning reductant air pressure sensor (B) harness

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Here are some steps which you should follow in order to diagnose this fault code:

This is a general type of error code which is diagnosed with the help of a scanner. The mechanic will insert a scanner to diagnostic port of the vehicle and recover the codes and freeze frame data. If he happens to find any additional error codes, he has to address them as well. Once it is done, he has to reset the vehicle, and then test drive to see if the error code appears. If the error code does not return, then there can be an erratic condition.

Step 1

First of all DVOM is used to check the reductant injection system pressure sensors as per the specifications set by the manufacturer. If there are some components which would not lie within the maximum allowable parameters set by the manufacturer, then it would mean that they are faulty.

Step 2

If the reductant injection pressure is within parameters set by the manufacturer, the code P209C exists, and the sensor is in good working condition, use the DVOM to test input and output signal circuits between sensors and the PCM/SCR controller. All the controllers should be disconnected prior to using the DVOM for examining. Reductant injector sensor codes are often attributed to supply pumps which leak internally.

Common Mistakes When Diagnosing The P209C Code

Many a times the mechanics get confused about the identity of the oxygen sensor and the exhaust gas temperature sensor. This would cause a lot of trouble and simply replacing the oxygen sensor would not lead to a successful diagnosis.