P0339 Crankshaft position sensor “A” circuit intermittent

P0339 – OBD-II Trouble Code Technical Description

Trouble code P0339 indicates that the vehicle's computer has detected an intermittent voltage in the crankshaft position sensor "A" circuit.

What does the fault code mean P0339?

Trouble code P0339 indicates that the vehicle's computer has detected an abnormal voltage in the crankshaft position sensor "A" circuit that is different from the manufacturer's specifications.

Possible reasons

Some possible reasons for the P0339 trouble code:

• Malfunction of the crankshaft position sensor: The sensor itself may be damaged or have problems with the electrical circuit.
• Wiring and Connectors: The wiring connecting the crankshaft position sensor to the vehicle's computer may be damaged, broken, or have oxidized contacts. There may also be problems with the connectors.
• Vehicle computer (ECM) malfunction: Problems with the vehicle's computer, which processes data from the crankshaft position sensor, can cause this error to appear.
• Incorrect sensor installation: Incorrect installation of the crankshaft position sensor may result in incorrect data reading and an error.
• Problems with the power system: Problems with the power system, such as problems with the battery or alternator, can result in high voltage in the sensor circuit.
• Malfunction in the vehicle's electrical system: Problems with other components of the vehicle's electrical system, such as shorts or circuits, can cause the P0339 code.

It is important to carry out diagnostics to determine the specific cause of the error on a specific vehicle.

What are the symptoms of a fault code? P0339?

Some possible symptoms that may occur when the P0339 trouble code appears:

• Using Backup Mode: The vehicle may go into standby mode, which may result in limited engine power and poor performance.
• Loss of engine power: Acceleration and acceleration performance may be impaired due to incorrect data from the crankshaft position sensor.
• Unstable idle: Rough or shaking idle may occur due to improper fuel mixture or ignition timing.
• Unusual sounds and vibrations: Unusual sounds or vibrations in the engine may be due to erroneous data from the crankshaft position sensor.
• Difficulty starting the engine: The engine may have trouble starting or the number of attempts required to start the engine may increase.
• Check Engine: When trouble code P0339 appears, the Check Engine Light or MIL (Malfunction Indicator Lamp) may illuminate on the instrument panel.

How to diagnose a fault code P0339?

To diagnose DTC P0339, follow these steps:

• Checking the error code: You must first use a diagnostic scan tool to read the error code from the engine control module memory.
• Visual inspection: Inspect the wiring and connectors connecting the crankshaft position sensor to the vehicle's computer for damage, breaks, or oxidation.
• Checking the crankshaft position sensor: Using a multimeter, check the resistance and voltage at the crankshaft position sensor terminals. Make sure the values ​​are within the manufacturer's specifications.
• Electrical circuit check: Check the electrical continuity, including fuses, relays, and wiring associated with the crankshaft position sensor.
• ECM diagnostics: If necessary, perform a performance test on the vehicle's computer (ECM) to rule out ECM malfunction as a possible cause.
• Checking other sensors: Check the condition of other sensors, including the camshaft sensor, as failure in other components of the ignition and fuel injection system can also cause P0339.
• Real world testing: Road test the vehicle to check how the engine performs under various operating conditions and to identify any unusual symptoms.
• Professional diagnostics: In case of difficulties or lack of competence, it is recommended to contact a professional auto mechanic or service center for more detailed diagnostics and repairs.

Diagnostic errors

When diagnosing DTC P0339, the following errors may occur:

• Misinterpretation of data: Incorrect interpretation of data received from the scanner may lead to incorrect diagnosis and incorrect conclusions about the causes of the malfunction.
• Skipping important steps: Skipping certain diagnostic steps, such as checking wiring or testing other system components, may result in missing possible causes of the error.
• Incorrect testing: Improper testing of the sensor or its environment can lead to erroneous results and incorrect conclusions about the condition of components.
• Unaccounted external factors: Ignoring external factors such as the environment or vehicle operating conditions can lead to misinterpretation of symptoms and erroneous conclusions.
• Improper repair: Inability or incorrect choice of repair methods to resolve the problem may lead to it not being corrected properly or the error returning in the future.
• Ignoring other possible causes: By focusing on only one cause of a fault, detection of other possible problems may be missed, causing the fault to reoccur.

How serious is the fault code? P0339?

Trouble code P0339 indicates problems with the crankshaft position sensor, which can have a serious impact on engine performance and overall vehicle performance. It is important to note that this issue can cause the following:

• Loss of power and performance: Incorrect crankshaft position sensing can result in engine roughness, loss of power and overall poor vehicle performance.
• Engine damage: Improper operation of the crankshaft position sensor may result in incorrect ignition timing and fuel injection, which may result in engine knocking and engine damage.
• Increased emissions of harmful substances: Uneven engine operation can lead to increased emissions of harmful substances, which can lead to disruption of the emission control system and negative impact on the environment.
• Risk of engine stalling: In some cases, if the sensor is seriously malfunctioning, the engine may stop, which can lead to an emergency on the road.

Therefore, trouble code P0339 should be considered a serious problem that requires immediate attention and diagnosis to prevent further damage and ensure the safety and reliability of the vehicle.

What repair will help eliminate the code? P0339?

To resolve DTC P0339, the following steps are recommended:

1. Replacing the crankshaft position sensor: If the crankshaft position sensor is truly bad or has failed, replacing it should fix the problem.
2. Checking wiring and connectors: Check the condition of the wiring and connectors connecting the crankshaft position sensor to the vehicle computer. Make sure the wiring is not damaged or oxidized and that all connections are secure.
3. Vehicle Computer Diagnostics (ECM): Check the operation of the vehicle's computer to eliminate its malfunction as a possible cause of the error.
4. Software update (firmware): Sometimes updating the engine control module (ECM) software can help resolve the problem, especially if the error is caused by a software glitch or version incompatibility.
5. Checking and cleaning contacts: Check the contacts for corrosion or oxidation and clean if necessary.
6. Checking other components of the ignition and fuel injection system: Check the condition of other components such as the camshaft sensor, ignition and fuel injection system, as faults in these components can also cause P0339.

If you are not confident in your skills or do not have the necessary equipment to carry out diagnostics and repairs, it is recommended that you contact a qualified auto mechanic or an authorized service center.

How to Fix P0339 Engine Code in 2 Minutes [1 DIY Method / Only $9.35]

P0339 – Brand-specific information

Trouble code P0339 is related to the crankshaft position sensor and can apply to different makes of vehicles. Below is a list of several car brands with their definitions:

• Toyota: Problem with the crankshaft position sensor.
• Honda: Crankshaft position sensor malfunction.
• Ford: High voltage in the crankshaft position sensor circuit.
• Chevrolet: The crankshaft position sensor voltage is too high.
• Nissan: Malfunction of the crankshaft position sensor or problems with its electrical circuit.
• BMW: Crankshaft position sensor malfunction.
• Volkswagen: Problems with the crankshaft position sensor.
• Audi: The crankshaft position sensor circuit voltage is too high.
• Mercedes-Benz: Problem with the crankshaft position sensor.
• Hyundai: High voltage at the crankshaft position sensor.

Check what make of vehicle you are interested in to get more information about the P0339 trouble code for your specific model.