P2047 trouble code definition
The P2047 code is a general OBD2 trouble code that points to a fault within the reductant injector circuit.
What the P2047 code means
The P2047 code means a fault is present in the reductant injection valve circuit, bank 1 unit 1. The reductant injector is used to reduce emissions gases exiting the exhaust by injecting either air or chemicals depending on the usage and vehicle. When the ECU detects the fault in the reductant injector circuit, it will set the P2047 code and the Check Engine Light will be displayed on the dashboard.
What causes the P2047 code?
- Poor electrical connection
- Open or short in the reductant injector circuit
- EGT sensor failure
- Exhaust leaks
What are the symptoms of the P2047 code?
The Check Engine Light is the most common symptom of the P2047 code. In rare cases, the driver may notice black smoke under heavy acceleration.
How does a mechanic diagnose the P2047 code?
Using this step by step diagnostic procedure technicians may successfully diagnose the P2047 code:
Hook up a scan tool to the DLC port and check for any codes present.
Note the codes and freeze frame data from all the codes.
Clear the stored codes from the ECU.
Perform a road test under similar conditions as the freeze frame data indicated.
Check that the P2047 is the code that has come back after the test drive.
A visual inspection will be done looking for signs of exhaust leaks or damaged wiring for either the sensor itself of the harness.
Using a multimeter, the OHMs will be checked to the exhaust gas temperature sensor.
The vehicle will be ran and the presence of exhaust leaks will be checked.
Common mistakes when diagnosing the P2047 code
Commonly an exhaust leaks is often overlooked as the cause of the P2047 code. When an exhaust leak is present it causes air to enter the exhaust and this changes the readings of the oxygen sensors and the exhaust gas temperature readings.
How serious is the P2047 code?
The P2047 code will generally not have any drivability concerns that would prevent the vehicle from being driven.
This code will cause the vehicle to fail emissions testing and may cause more exhaust emissions to exit the exhaust.
What repairs can fix the P2047 code?
- Fixing poor electrical connection issues
- Repairing or replacing the reductant injector wiring harness
- Replacing the exhaust gas temperature sensor
- Repairing of exhaust leaks
Additional comments for consideration regarding the P2047 code
Exhaust leaks can cause strange symptoms in modern cars. A easy way to find if the exhaust is leaking is to inspect the exhaust system while the vehicle is running. Caution should be taken when doing this as the exhaust can easily burn you.
Exhaust leaks can have a whistling sound or can be felt. In some cases the exhaust leak will leave a black sooty mark on the exhaust pipe right where the leak is making it very easy to find.
Need help with a P2047 code?
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