Guide To P2338 OBD Error Code Solutions
OBD Code P2338 - Cylinder 3 Above Knock Threshold
The
trouble code P2338 can be explicated as Cylinder 3 Above Knock Threshold. If
the engine control module would detect a variation in the voltage coming from
the knock sensor circuit for cylinder 3 delivered performance that is outside
the parameters set by the automobile manufacturer, then it would store the
P2338 fault code. This would give rise to the flashing up of the check engine
light.
Learn More About OBD Error Code P2338
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. The engine control module, powertrain control module or the transmission control module monitors this circuit depending upon the particular automobile.
What causes this problem with the Cylinder 3 Above Knock Threshold?
- The knock sensor might be flawed
- Knock sensor harness is not shut or tiny
- There might be poor electrical connection in the knock sensor circuit
- There can be distorted PCM
Replace/Repair These Parts To Fix Code P2338
- Intake Manifold - When the intake manifold fails, it can leave the engine
without the increased performance, and in some cases even reduce performance.
Usually a faulty intake manifold will produce a few symptoms that can alert the
driver of a potential issue. Thus, replace damaged component now!
- Knock Sensor - If you noticing
that you’re getting fewer miles per gallon than you normally do, then a faulty
knock sensor could be contributing to that. So it is very important to replace
the defective knock sensor with us at equitable prices.
- Engine Control
Module -
Want to know the most common reason behind the failure in the engine control
module? Corrosion or damage because of moisture can cause ECM failure. Corrosion might enter the ECM through the wiring
harness and moisture can enter by a failure in the seals in the ECM itself.
- Fuel Injector - Affected fuel injectors can cause reduced performance
and throttle response. It can also affect the fuel economy and affect the
engine emission. Thus, replace faulty fuel injector now!
- Powertrain Control
Module -
The PCM makes the engine and transmission work in tandem. Any issue with the
powertrain control module will cause major problems with the efficient running
of the vehicle.
- Electronic Control
Unit - If your vehicle fails to start
for no apparent reason, this is also a good indicator that there can be some
issues with the ECU. If you check the car battery, starter and other common
electrical components, and the vehicle still does not start, a quirky
electronic control unit should be the next logical thing to consider.
- Diagnostic
Tool - In order to fix these errors, you need few diagnostic
tools to get your car problems pointed out easily. Our diagnostic tools
collection will come handy to do so and resolve all your vehicle problems.
Visit today!
Symptoms Of The OBD Error Code P2338
It is vital 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 P2338 here:
Common Symptoms
- Illumination in the service engine soon light
- Some noises from car engine
- Decline in the fuel economy
- Bad engine performance
- Some other codes can also exist
How To Correct P2338 Cylinder 3 Above Knock Threshold
The repairs which you will have to do to correct this fault code are simply straightforward; you can surely pinpoint the necessary repairs on the basis of your diagnosis. Have a look at some common fixes:
- The knock sensor wiring should be restored to working order
- It is necessary to perform proper service of the unsound knock sensor
- Adjust the flawed wiring
- It is essential to restore the flawed PCM
- Repair or replace the quirky spark plug
- Rehabilitate the defaults in the knock sensor connector
- Carefully adjust the faults in the fuel injector
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Easy Diagnosis Of Engine Error OBD Code P2338
Here are some steps which you should follow in order to diagnose this fault code:
- This is a general type of error code which is diagnosed with the help of a scanner. Use the vehicle information source to search for applicable technical service bulletins (TSB). If you locate a TSB that matches the vehicle make and model, symptoms exhibited, and the code stored, it will help you to arrive at a diagnosis.
- You may also need to obtain diagnostic flow charts, wiring diagrams, connector face views, connector pin out charts, component locations, and component testing procedures/specifications from the vehicle information source. All this information will be needed to correctly diagnose the stored code P2338.
- After that test drive the vehicle to see if the code P2338 is reset. Drive until one of two things happens: Either the PCM enters readiness mode or the code is reset. If the code is reset, continue with the diagnosis. If it is not, you are dealing with an intermittent condition which may have to worsen before an accurate diagnosis may be achieved. Now if the code has been restored, then you must continue with the diagnosis.
- One should obtain connector face views, connector pin out charts, component locator charts, wiring diagrams, and diagnostic flow charts by utilizing your source of vehicle information.
- A visual inspection of associated wiring and connectors should be performed. Make sure to repair or restore the wiring that has been cut, burned, or flawed. The scheduled maintenance would include the replacement of spark plug wires and boots. Now if the automobile is beyond the recommended maintenance interval for a tune up, then it would mean that there are some faults in the spark plug wires/boots which are giving rise to P2338 error code.
- Once the PCM has been disconnected, then the DVOM should be utilized to inspect the continuity in the knock sensor circuit. Since the knock sensor typically threads into the engine block, then you must utilize caution not to get burned with coolant or oil whenever the sensor is being removed.
- The continuity through the sensor and back to the PCM connector should be inspected properly. The P2338 fault code can generally be related to a PCM programming error, faulty knock sensor or spark knocks.
Common Mistakes When Diagnosing The P2338 Code
The technician might think that the engine's knock sensor is defective. If the knock sensor has reported a problem, it is quite possible that the issue must be real. Faulty knock sensors are known to occur; by restoring a sensor mistakenly will waste resources without doing anything to solve the root problem.