Error Code P047D: What It Means & What To Do?

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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 trouble code P047D can be defined as Exhaust Pressure Sensor B High Input. This fault code would start appearing when the incoming signal from the exhaust pressure sensor is not matching intake manifold pressure or ambient air pressure. This can occur due to an electrical circuit fault or sometimes it can be due to mechanical reasons.

What causes this problem with the Exhaust Pressure Sensor B High 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
• The exhaust pressure sensor might be quirky
• Defective in the powertrain control module

1. Powertrain Control Module - There can be some issues with the Powertrain Control Module due to which you may see P047D code appearing over and over again. Visit us to buy best quality PCM online.
2. EGR Valve Gasket - A lot of issues can arise do to defective EGR Valve Gasket. Did you just see P047D code flashing? Now you know the reason why it is appearing. Get it inspected and replaced on time.
3. Manifold Absolute Pressure Sensor - Faulty Manifold Absolute Pressure Sensor can be the reason why P047D code is flashing. Visit us to purchase top notch Manifold Absolute Pressure Sensor online.
4. Turbocharger - It is an important auto part which needs full care. A faulty Turbocharger can be a reason behind the flashing up of P047D code.
5. Fuel Pressure Sensor - There can be some issues with the Fuel Pressure Sensor due to which you may see P047D code appearing over and over again. Visit us to buy best quality Fuel Pressure Sensor online.
6. Exhaust Manifold - Are you facing some faults in your Exhaust Manifold? Don’t worry and get them replaced or else P047D code can turn up.
7. Supercharger - Common cause behind this P047D error code can be some fault in Supercharger. So, it will be a good decision to replace them now.

You might be thinking that how would you diagnose these problems? We at Parts Avatar Canada would help you diagnose the major symptoms easily.

Common Symptoms

• 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
• Illumination of the check engine light
• There might be lack of power
• If unable to perform regeneration, eventually may become a crank-no start

Looking out for some ways with the help of which you can correct this fault code? Then you have arrived at the correct place. We are here to help you out, so you must check out the steps mentioned below as follows:

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'

There is no need to get strained if your OBD Code is still flashing up as we are here at your service. Have a look at our superior variety of harness, manifold pressure, tire pressure gauge, oil pressure sensor, turbo kit and many more. Now all your problems would vanish within no time.

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

First of all you must perform 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 you think its 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 P047D code, this would most likely indicate a failed exhaust pressure sensor, although a failed PCM could not be ruled out until you replace the sensor

Common Mistakes When Diagnosing The P047D Code

• Failure in the exhaust pressure sensor
• Quirky powertrain control module
• Issue of wiring problems