P047E Exhaust Gas Pressure Sensor Circuit Malfunction B

P047E Exhaust Gas Pressure Sensor Circuit Malfunction B

OBD-II DTC Datasheet

Exhaust Gas Pressure Sensor "B" Circuit Unstable / Unstable

What does this mean?

This Generic Powertrain / Engine DTC applies to all engines using variable nozzle turbochargers (gas or diesel) since about 2005 on Ford trucks equipped with 6.0L diesel engines, all Ford EcoBoost engines, and ultimately eventually leads to the Cummins 6.7 L model. 2007, 3.0L in Mercedes lineup in 2007 and recently here Cummins 3.0L 6-cylinder in Nissan pickups starting in 2015. This does not mean that you will not necessarily get this code on a VW or other model.

This code strictly refers to the fact that the input signal from the exhaust pressure sensor does not match the intake manifold pressure or ambient air pressure at different times while the engine is running. It could be an electrical fault or a mechanical fault.

Codes P047B, P047C or P047D can also be present at the same time as P047E. The only difference between these codes is how long the problem lasts and the type of electrical / mechanical problem that the motor sensor / circuit / controller is experiencing.

Troubleshooting steps may vary depending on the manufacturer, gasoline or diesel, type of exhaust pressure sensor and wire colors. Consult your specific vehicle repair manual to determine which sensor “B” your specific vehicle has.

Typical Exhaust Pressure Gauge:

Corresponding Exhaust Gas Pressure Sensor "B" DTCs:

• P047A Exhaust Gas Pressure Sensor B Circuit
• P047B Exhaust Gas Pressure Sensor "B" Circuit Range / Performance
• P047C Low sensor "B" exhaust pressure
• P047D A high indicator of the sensor "B" exhaust pressure

symptoms

Symptoms of a P047E engine code may include:

• Check Engine light is on
• Lack of power
• Unable to perform manual regeneration - burn the particulate filter from the particulate filter. Looks like a catalytic converter, but it has temperature sensors and pressure sensors inserted into it.
• If regeneration fails, a non-cranking start may eventually occur.

Possible reasons

Usually the reason for installing this code is:

• Clogged tube from exhaust manifold to pressure sensor
• Exhaust Gas Recirculation / Air Intake / Charge Air Leaks
• Intermittent open in the ground circuit to the exhaust gas pressure sensor
• Intermittent open in the signal circuit between the exhaust pressure sensor and the PCM
• Intermittent short to voltage in the signal circuit of the exhaust pressure sensor Exhaust pressure sensor
• Powertrain Control Module (PCM) may have failed (unlikely)

Diagnostic and repair procedures

A good starting point is always to find a Technical Service Bulletin (TSB) for your specific vehicle. The vehicle manufacturer may have a flash memory / PCM reprogramming to fix this problem and it's worth checking it out before you find yourself on the long / wrong path.

Then find the exhaust pressure sensor on your specific vehicle. Once detected, disconnect the tubing that connects the sensor to the exhaust manifold. Try to break through this. If that doesn't work, try running a small piece of wire through it to remove the carbon that's stuck inside, causing the DTC you're encountering.

If the tubing is clean and loose, visually inspect the connectors and wiring. Look for scuffs, scuffs, exposed wires, burn marks, or molten plastic. Disconnect the connectors and carefully inspect the terminals (metal parts) inside the connectors. See if they look rusty, burnt, or perhaps green compared to the usual metallic color you're probably used to seeing. If terminal cleaning is required, you can purchase electrical contact cleaner at any parts store. If this is not possible, find 91% rubbing alcohol and a light plastic bristle brush to clean them. Then let them air dry, take a dielectric silicone compound (the same material they use for bulb holders and spark plug wires) and place where the terminals make contact.

Then check that the pipe connecting the turbocharger to the intake manifold is not leaking. Inspect all pipe connections around the turbocharger and intake manifold. Tighten all hose / tape clamps.

If you have a scan tool, clear the diagnostic trouble codes from memory and see if the code returns. If this is not the case, then there is most likely a connection problem.

If the code returns, we will need to test the sensor and associated circuits. There are usually 3 wires on the exhaust pressure sensor. Disconnect the harness from the exhaust pressure sensor. Use a digital volt ohmmeter (DVOM) to check the 5V power supply circuit going to the sensor to make sure it is on (red wire to 5V power supply circuit, black wire to good ground). If the sensor is 12 volts when it should be 5 volts, repair the wiring from the PCM to the sensor for a short to 12 volts or possibly a faulty PCM.

If this is normal, with the DVOM, make sure you have 5V on the exhaust pressure sensor signal circuit (red wire to sensor signal circuit, black wire to good ground). If there is no 5 volts on the sensor, or if you see 12 volts on the sensor, repair the wiring from the PCM to the sensor, or again, possibly a faulty PCM.

If normal, check that the exhaust pressure sensor is properly grounded. Connect a test lamp to the 12 V battery positive (red terminal) and touch the other end of the test lamp to the ground circuit that leads to the exhaust gas pressure sensor circuit ground. If the test lamp does not light up, it indicates a faulty circuit. If it does light up, wiggle the wire harness going to each terminal to see if the test lamp blinks, indicating an intermittent connection.

If all tests have passed so far and you continue to receive the P047E code, try wiggling the sensor harness while watching the scan tool to see if the code returns. If so, it most likely indicates an intermittent connection in the harness. Otherwise, it will most likely indicate a faulty exhaust pressure sensor, although a failed PCM cannot be ruled out until the sensor is replaced.

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