P047C - OBD Trouble Code

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Has your powertrain control module started failing? Or are there some faults in the exhaust pressure sensor? Is there an open in the signal circuit between the exhaust pressure sensor and the PCM? If the answer to all these questions is a big YES, then there are chances that the P047C trouble code would soon start appearing.

Want to know something more about the P047C trouble code? The trouble code P047C can be defined as Exhaust Pressure Sensor B Low Input. 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.

What causes this problem with the Exhaust Pressure Sensor B Low Input?

• There can be open in the signal circuit between the exhaust pressure sensor and the PCM
• The power supply circuit between the exhaust pressure sensor and the PCM might be opened
• Issue of short to ground in the signal circuit to the exhaust pressure sensor
• Flaws in the exhaust pressure sensor
• Failure in the powertrain control module

1. Supercharger - Do you remember when was the last time you got your car Supercharger inspected up? A dirty Supercharger can cause a lot of issues like displaying P047C code.
2. Fuel Pressure Sensor - Are there some faults in your Fuel Pressure Sensor? Don’t waste time and get them replaced or else P047C code can turn up.
3. Turbocharger - OBD Code P047C can appear because of faulty Turbocharger. Visit us to buy top notch Turbocharger online.
4. Exhaust Manifold - Everything is fine with Fuel Pressure Sensor and still P047C code triggering? Then you must get your Exhaust Manifold checked.
5. Manifold Absolute Pressure Sensor - There can be some issues with the Manifold Absolute Pressure Sensor due to which you may see P047C code appearing over and over again. Visit us to buy best quality Manifold Absolute Pressure Sensor online.
6. EGR Valve Gasket - A lot of issues can arise do to defective EGR Valve Gasket. Did you just see P047C code flashing? Now you know the reason why it is appearing. Get it inspected and replaced on time.
7. Powertrain Control Module - Faulty Powertrain Control Module can be the reason why P047C code is flashing. Visit us to purchase top notch Powertrain Control Module online.

Our main motive is to achieve customer satisfaction and that’s why we will help you to diagnose P047C code by mentioning some major symptoms below:

Common Symptoms

• The check engine light can start flashing up
• There can be a decrease of power
• Unable to perform manual regeneration – burn off the soot out of the particulate filter. Looks like a catalytic converter but has temp sensors and pressure sensor probes inserted into it
• If unable to perform regeneration, eventually may become a crank-no start

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P047C:

• If there is blockage in the tube from the exhaust manifold to the pressure sensor, then it should be corrected
• Replace or repair the exhaust gas recirculation system
• Make sure to repair the faulty exhaust gas pressure sensor
• The defective powertrain control module should be replaced
• Restore the quirky exhaust back pressure sensor 'B'

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

• It would be a great idea to start with a technical service bulletin search for your particular vehicle. The vehicle manufacturer may have a PCM flash/reprogram to cover this issue, and it pays to check on this before you find you’ve gone down a long/wrong path. The next step would be to locate the exhaust pressure sensor on your particular vehicle. Once located, disconnect the tube that connects the sensor to the exhaust manifold
• Attempt to blow through it. If you are not able to do that, try to run a small piece of wire through it to dislodge the carbon that is trapped inside, causing the fault code you are encountering. If the tube is clear and free, then you must visually inspect the connectors and wiring. Look for chafing, rubbing, bare wires, burn spots or melted plastic. The connectors should be pulled apart and carefully inspect the terminals (the metal parts) inside the connectors. See if they look corroded, burnt or possibly green in color versus the normal metal color you are probably used to seeing. You can get some electrical contact cleaner at any parts store if cleaning of the terminals is needed
• If this is not possible, find some 91% rubbing alcohol and a light plastic bristle brush to clean them with. After that you should let the air dry, get some dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and put some where the terminals come into contact. Next, make sure that the tube that connects the turbocharger to the intake manifold is not leaking. Visually inspect all tube connections around the turbocharger and intake manifold. Tighten all hose as well as band clamps
• If you have a scan tool, clear the diagnostic trouble codes from memory, and see if this code returns. If it does not, then there is surely some issue in the connections. If the code does return, we will need to test the sensor and as well as the circuits with are related to it. There are 3 wires at the exhaust pressure sensor
• Disconnect the harness going to the exhaust pressure sensor. You should use a digital volt ohm meter to test the 5V power supply circuit going to the sensor to insure it is being powered up. If there is 12 volts to the sensor when there should be 5 volts, repair the wiring from the PCM to the sensor for a short to 12 volts, or possibly a bad powertrain control module
• If it is fine, then use a DVOM check to make sure you have 5V on the exhaust pressure sensor signal circuit. If there is no 5 volts to the sensor, or if you see 12 volts to the sensor, repair the wiring from the PCM to the sensor, or once again a possible bad PCM. Then check to make sure you have a good ground at the exhaust pressure sensor. Connect a test light to 12V battery positive (red terminal) and touch the other end of the test light to the ground circuit going to the exhaust pressure sensor circuit ground. If the test light does not light up, this would indicate the problem circuit. If it does light up, wiggle the wiring harness going to each sensor to see if the test light flickers, indicating an intermittent connection
• If all tests have passed so far, and you continue to get a P047C code, this would most likely indicate a defective exhaust pressure sensor, although a failed PCM could not be ruled out until you replace the sensor

Common Mistakes When Diagnosing The P047C Code

• Flaws in the exhaust pressure sensor
• The powertrain control module might be faulty
• There might be some issues related to the wiring