P047E OBD Error Code: Problem & Solutions

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The error code P047E can be described as Exhaust Pressure Sensor Circuit B Intermittent. The Exhaust Back Pressure (EBP) sensor produces a linear analog voltage signal which indicates pressure when a 5-volt reference signal is supplied to it from the engine control module. It is a variable capacitance sensor. The main function of the EBP sensor is to measure exhaust back pressure so that the exhaust back pressure regulator can be controlled by the engine control module as per the requirement.

Want to learn something more about this fault 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.

What causes this problem with the Exhaust Pressure Sensor Circuit B Intermittent?

• 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. EGR Valve Gasket - OBD Code P047E can appear because of faulty EGR Valve Gasket.
2. Powertrain Control Module - There can be some issues with the Powertrain Control Module due to which you may see P047E code appearing over and over again. Visit us to buy best quality PCM online.
3. Supercharger - Are you facing some faults in your Supercharger? Don’t worry and get them replaced or else P047E code can turn up.
4. Exhaust Manifold - Common cause behind this P047E error code can be some fault in Exhaust Manifold. So, it will be a good decision to replace them now.
5. Manifold Absolute Pressure Sensor - Supercharger is perfectly fine but still but having that trouble code P047E flashing? In such a situation your Manifold Absolute Pressure Sensor might be faulty. Why don’t you think of getting that replaced?
6. Turbocharger - The P047E code can also arise due to some issues in Turbocharger. So, it is advised to replace them as soon as possible.
7. Fuel Pressure Sensor - P047E code does not really end up spoiling your Manifold Absolute Pressure Sensor, but it might also accompany few Fuel Pressure Sensor issues. We have best Fuel Pressure Sensor with us.

It is essential 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 P047E here:

Common Symptoms

• Appearance of the check engine light
• 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
• Diminishing power

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 P047E:

• 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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If you want to easily diagnose this trouble code, then you must follow the steps which are mentioned here as below:

• 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
• 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 P047E 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 P047E Code

• Failure in the exhaust pressure sensor
• Defective powertrain control module
• There might be some issues related to the wiring