Diagnostic Trouble Code
P2347
Cylinder 12 Above Knock Threshold
Technical Description P2347
Cylinder 12 Above Knock Threshold
Severity Level P2347
When a P2347 is stored, the cause should be diagnosed as soon as possible. Symptoms which contribute to this type of code being stored may range from minimal to catastrophic.
Symptoms P2347
1
Engine noise
2
Diminished engine performance
3
Reduced fuel efficiency
4
Other related codes
5
There may be no distinguishable symptoms
Possible Causes P2347
1
Bad knock sensor
2
Mistimed engine or improper fuel type
3
Open or shorted wiring or wiring connectors
4
Engine noise caused by component failure
5
PCM or programing error
Solutions & Repair Steps P2347
Make sure that the engine is filled to the proper level with the appropriate oil and that is in good working order. Actual engine noise, such as spark knock must be eliminated before a diagnosis of a P2347 can be made.
You will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a source of reliable vehicle information in order to accurately diagnose a code P2347.
You may save yourself time and trouble by searching for technical service bulletins (TSB) that replicate the code stored, vehicle (year, make, model, and engine), and symptoms exhibited. This information may be found in your vehicle information source. If you find the right TSB, it could yield a speedy solution to your diagnosis.
After you connect the scanner to the vehicle diagnostic port and retrieve all stored codes and pertinent freeze frame data, write the information down (in case the code proves to be an intermittent one). After that, clear the codes and test drive the vehicle until one of two things happens; the code is restored or the PCM enters readiness mode.
The code may be more difficult to diagnose if the PCM enters readiness mode at this point, because the code is intermittent. The condition which caused the P2347 to be stored may need to worsen before an accurate diagnosis can be made. If the code is restored, continue with the diagnosis.
You may obtain connector face views, connector pinout charts, component locator charts, wiring diagrams, and diagnostic flow charts (pertaining to the code and vehicle in question) using your source of vehicle information.
Perform a visual inspection of related wiring and connectors. Repair or replace wiring that has been cut, burned, or damaged. Scheduled maintenance includes the replacement of spark plug wires and boots. If the vehicle in question is beyond the recommended maintenance interval for a tune up, suspect bad spark plug wires/boots as the cause of a stored P2347.
After disconnecting the PCM, use the DVOM to check continuity in the knock sensor circuit. Since the knock sensor typically threads into the engine block, use caution not to get burned with coolant or oil when removing the sensor. Test continuity through the sensor and back to the PCM connector.
You will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a source of reliable vehicle information in order to accurately diagnose a code P2347.
You may save yourself time and trouble by searching for technical service bulletins (TSB) that replicate the code stored, vehicle (year, make, model, and engine), and symptoms exhibited. This information may be found in your vehicle information source. If you find the right TSB, it could yield a speedy solution to your diagnosis.
After you connect the scanner to the vehicle diagnostic port and retrieve all stored codes and pertinent freeze frame data, write the information down (in case the code proves to be an intermittent one). After that, clear the codes and test drive the vehicle until one of two things happens; the code is restored or the PCM enters readiness mode.
The code may be more difficult to diagnose if the PCM enters readiness mode at this point, because the code is intermittent. The condition which caused the P2347 to be stored may need to worsen before an accurate diagnosis can be made. If the code is restored, continue with the diagnosis.
You may obtain connector face views, connector pinout charts, component locator charts, wiring diagrams, and diagnostic flow charts (pertaining to the code and vehicle in question) using your source of vehicle information.
Perform a visual inspection of related wiring and connectors. Repair or replace wiring that has been cut, burned, or damaged. Scheduled maintenance includes the replacement of spark plug wires and boots. If the vehicle in question is beyond the recommended maintenance interval for a tune up, suspect bad spark plug wires/boots as the cause of a stored P2347.
After disconnecting the PCM, use the DVOM to check continuity in the knock sensor circuit. Since the knock sensor typically threads into the engine block, use caution not to get burned with coolant or oil when removing the sensor. Test continuity through the sensor and back to the PCM connector.