P2347 - OBD Trouble Code

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What does P2347 error code mean? What are the common symptoms and causes? Are there any diagnostic procedures? Are these questions popping up in your mind? Then keep reading further. This is a general type of diagnostic trouble code which is related to ignition issues like misfiring of the engine. This error appears when the ECM receives a voltage reading which is outside the permitted variance from #3 cylinder.

The cylinder will start running lean if enough fuel is not allowed into the cylinder by the fuel injector. Every time the injector is altered, the calibration number which is available on the side of the injector has to go into the engine computer that is the PCM. If the number does not go into the PCM, then the P2347 error will get stored in the vehicle.

What causes this problem with the Cylinder 12 Above Knock Threshold?

The knock sensor holds the responsibility to make sure that the PCM is aware of sudden engine noises (which might be caused due to wrong air/fuel mixture which gives rise to irregular cylinder detonation), this error code is mostly the reaction to other serious issues. If there are any other error codes, they must be fixed and diagnosed before attempting to solve this error code. If the engine works normally and if the error still persists, the knock sensor can be damaged. Burnt or damaged wires and connectors, or disconnected connectors are also common reasons. Most often, the knock sensor is placed near the starter and the sensor connector gets broken due to starter replacement.

1. Knock Sensor - The knock sensor can malfunction if there is improper combustion of fuel and air. Change them as soon as possible.
2. Cylinder Head Gasket - Does your engine overheat very often? Then the cylinder head gasket can be faulty. Replace it quickly.
3. Sensor Connector - The sensor connector has to function normally without any damages so that the P2347 error code can be avoided.
4. Intake Manifold - Leakage of the coolant can cause the malfunctioning of the intake manifold. It is best to change them as quickly as possible.
5. Engine Control Module - Conditions of misfire shows that your ECM is faulty. Fix it as soon as possible to avoid the P2347 error in your vehicle by getting a new ECM from PartsAvatar.
6. Fuel Injector - Is the performance of the engine very rough? Then the fuel injector can be faulty. Get rid of it immediately.
7. Spark Plug - Is the performance of the engine sluggish? Is the fuel economy less? Then the spark plugs can be faulty. Get the right replacement from PartsAvatar to avoid P2347 error code.
8. Powertrain Control Module - The engine will fail to start or the fuel economy will be poor if the powertrain control module is faulty. Get them replaced as soon as possible so that you can get rid of the P2347 error code.

After knowing all the cause behind the issues, let’s have a look at a few common symptoms of this problem. Read through this section to learn more about this error code.

Common Symptoms

• There will be a power loss and the vehicle will refuse to accelerate which is accompanied by spark knock and illumination of the service engine soon lamp.
• The service engine warning light will keep blinking, or it will turn off irregularly and stays on for some more time and then goes off for shorter or more duration.

Here are some ways with the help of which you will be able to correct the OBD Code P2347

• The damaged fuel injector must be changed.
• Altering the faulty spark plugs.

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It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P2347 code to be stored:

• Most of the manufacturers prefer using single or multiple knock sensor which threads easily into the engine block.
• Usually, at least 2 knock sensors are needed for V-shaped engine blocks one for each cylinder. Whereas other automakers prefer equipping their vehicle with the knock sensor for each cylinder.
• Bank 1 describes the engine bank which holds the cylinder 1 and bank 2 does not hold the #1 cylinder.
• The low-voltage signal is used by the knock sensor which is nothing but a single-wire sensor which finds the adequate noise which comes from the engine.
• The grounding of the knock sensor will take place if more internal engine noise is found, which completes the circuit and supplies input voltage signal of 5V to the PCM.
• The voltage of the knock sensor is continually looked after by the PCM and it answers accordingly.
• Adjustments to the engine timing will be done so as to lessen the noise and to escape the engine damage if an erratic signal from the knock sensor is received by the PCM.
• To proceed with the diagnosis, a scanner and DVOM is needed.
• As you diagnose this error, a manufacturer’s service manual will be highly helpful.
• Start the diagnosis by inspecting the wires as well as the connectors.
• Fix the damaged, separated, shorted or eroded wires as needed.
• Recheck the system by clearing the error codes and make sure the repair work is done successfully.
• If each of the wires and connectors works properly, retrieve every of the stored codes and freeze frame data by fixing a scanner to the diagnostic connector.
• This data can be highly useful to diagnose the erratic conditions which would have helped in the storing of this code.
• Once the error codes are removed, check again to see if the error appears.
• Erratic conditions may persist if the code does not come quickly.
• In an extreme situation, this erratic condition can be quite risky to diagnose and this situation has to be made to worsen before you proceed further.
• Ensure to fill the engine will clean oil.
• Proceed further by paying attention to engine noise that is excessive.
• If you find any other error codes in the PCM, it must be fixed first before you proceed further for other diagnoses.
• It is best to carry out a manual oil pressure test if there is unusual engine noise and relate the findings as per the manufacturer’s recommendations.
• Engine components which are damaged must be changed.
• Recheck the system by clearing the error codes and make sure the repair work is done successfully.
• Remove the electrical connector from the sensor which is affected and perform a resistance test to the sensor if the engine sounds normal and there are no error codes.
• Relate the findings to the specification of the manufacturer and the damaged sensor as required.
• Recheck the system by clearing the error codes and make sure the repair work is done successfully.
• Perform a test for reference voltage if the sensor works well by separating the connector from the knock sensor.
• See if the wires are burnt, shorted or damaged if there is no reference voltage.
• Most technicians report that the failure was caused due to the engine oil which has been leaked into the knock sensor wires and connectors other than the normal and cleans wires and connectors.
• Detach the connector from the knock sensor and its linked controller if the system function normally.
• It’s better to perform a continuity and resistance test on the circuits which are damaged.
• Associate your findings with that of the specification by the manufacturer and fix the components which fail to comply.
• Recheck the system by clearing the error codes and make sure the repair work is done successfully.
• You will find a few of the knock sensors very close to the engine which makes it tough for testing.
• A separate process of elimination has to be performed for vehicles which are well-equipped knock sensors which leave the knock sensors as the final chance for the reason of failure.
• Note that, when changing the knock sensor, it must not be threaded into the coolant passage of the engine block.
• When the knock sensor is removed from the coolant passage of the hot engine, the technician might face severe burns on their skin.

Common Mistakes When Diagnosing The P2347 Code

One of the common cause for this error is the replacement of the knock sensor while the main issue is due to the malfunctioning of the engine. Ensure that the knock sensor is not only doing its job before throwing it to the scrap heap.