Description of the P0374 fault code.
OBD2 Error Codes

P0374 High resolution signal phase timing control “A” - no pulses

26.05.2022 /

P0374 – OBD-II Trouble Code Technical Description

Trouble code P0374 indicates that the PCM has detected a problem with the vehicle's timing system high-resolution reference “A” signal—no pulses.

What does the fault code mean P0374?

Trouble code P0374 indicates a problem with the high resolution “A” reference signal in the vehicle's timing system. This means that the engine control module or automatic transmission control module has detected instability or missing pulses in the signal that is normally used to properly synchronize the operation of the engine and transmission.

Fault code P0374.

Possible reasons

Several possible reasons for the P0374 trouble code:

  • Faulty crankshaft position (CKP) sensor: The CKP sensor is responsible for transmitting the crankshaft position signal to the engine management system. If the sensor is faulty or giving an incorrect signal, it can cause P0374.
  • Problems with wiring and connections: Opens, shorts, or other problems with the wiring, connections, or connectors between the CKP sensor and the engine control module can cause P0374.
  • Crankshaft sensor disc: Damage or wear to the crankshaft sensor disc may cause the signal to not be read correctly, causing P0374.
  • Problems with the engine control module (ECM) or transmission control module (PCM): Malfunctions in the ECM or PCM, which are responsible for processing signals from the CKP sensor and synchronizing the operation of the engine and automatic transmission, can also cause the P0374 code.
  • Problems with the ignition system or fuel injection system: Malfunctions in other components of the ignition or fuel injection system, such as ignition coils, spark plugs, or injectors, can cause the CKP sensor to malfunction and cause trouble code P0374.
  • Problems with the crankshaft gear or teeth: If the crankshaft gear or teeth are damaged or worn, it may affect the signal from the CKP sensor and cause P0374.

These are just a few examples of causes, and to accurately determine the cause of the P0374 code, it is recommended that you conduct a detailed diagnosis of the vehicle using diagnostic equipment or contact a professional auto mechanic.

What are the symptoms of a fault code? P0374?

Symptoms for DTC P0374 may include the following:

  • Problems with starting the engine: Rough engine starting or complete refusal to start may be one of the first signs of a problem with the crankshaft position (CKP) signal.
  • Rough engine operation: Observing rough engine operation, such as rattling, jerking, or rough idling, may also indicate problems with the CKP signal.
  • Loss of power: If the CKP signal is incorrect, the engine may lose power, resulting in poor overall vehicle performance.
  • Increased fuel consumption: Incorrect operation of the CKP signal may cause inefficient fuel combustion, which may result in increased fuel consumption.
  • Check Engine Light: The check engine light turning on on your car's dashboard is one of the most common symptoms of the P0374 code. This indicator warns the driver of possible problems with engine operation.
  • Gear shifting problems (for automatic transmissions): If the vehicle is equipped with an automatic transmission, errors with the CKP signal may cause problems with gear shifting or sudden movements.

These symptoms may occur to varying degrees and depending on the specific problem. If you experience these symptoms, it is recommended that you immediately contact a professional auto mechanic to diagnose and repair the problem.

How to diagnose a fault code P0374?

To diagnose DTC P0374, the following steps are recommended:

  1. Checking the error code: Use the OBD-II diagnostic scanner to read the P0374 error code from the ECU (engine control module) memory. This will allow you to pinpoint what is causing the problem.
  2. Visual inspection of the crankshaft position (CKP) sensor: Inspect the CKP sensor and its electrical connection for visible damage, corrosion, or broken wiring.
  3. Checking wiring and connections: Check the wiring, connections and connectors between the CKP sensor and the ECU for corrosion, breaks or broken contacts.
  4. Checking the resistance of the CKP sensor: Using a multimeter, check the resistance of the CKP sensor. The resistance must meet the manufacturer's specifications.
  5. Checking the CKP sensor signal: Using an oscilloscope or multimeter with graphing function, check the signal generated by the CKP sensor when the crankshaft rotates. The signal must be stable and have the correct shape.
  6. Checking the crankshaft gear or teeth: Check the condition of the crankshaft gear or teeth for damage or wear.
  7. Additional tests: In some cases, additional tests may be required, such as checking the voltage and signal on the CKP sensor wires, and checking the electrical parameters in the ignition system.

After diagnosing and determining the cause of the P0374 error, you can begin to repair or replace the relevant components. If you are unable to diagnose it yourself, it is recommended that you contact a qualified auto mechanic or service center.

Diagnostic errors

When diagnosing DTC P0374, the following errors may occur:

  • Faulty hardware: Using faulty or inappropriate diagnostic equipment may result in incorrect results and incorrect diagnosis.
  • Insufficient wiring check: The problem is not always clearly visible on the wiring. Inspecting wiring incorrectly or insufficiently may result in missing problems with broken, corroded, or otherwise damaged wiring.
  • Incorrect interpretation of sensor data: Incorrect interpretation of the CKP sensor data can lead to an erroneous conclusion about its status.
  • Problems with physical components: Some problems, such as gear damage or worn crankshaft teeth, may be missed due to improper or insufficient inspection.
  • Incomplete check of system components: Sometimes the problem may be related to other components of the ignition system, fuel injection system or exhaust system. Failure to fully check these components may result in missing the cause of the P0374 code.

To minimize potential errors when diagnosing DTC P0374, it is recommended that you thoroughly inspect all components, run the test using the appropriate diagnostic equipment, and carefully analyze the data obtained. If in doubt or difficulty arises, it is best to contact a professional auto mechanic for assistance.

How serious is the fault code? P0374?

Trouble code P0374 is serious because it indicates a problem with the high resolution “A” reference signal in the engine timing system. Inconsistency or incorrect reading of this signal can lead to a number of problems with the operation of the engine and other vehicle systems. Some of the potential consequences include:

  • Rough engine operation: Improper engine timing can cause rough operation, rattling and jerking, which can impair ride quality and comfort.
  • Loss of power: Incorrect timing may cause loss of engine power, which will affect engine performance.
  • Problems with starting the engine: An incorrect timing signal can make the engine difficult to start or even cause it to start completely.
  • Increased fuel consumption and emissions: Imperfect combustion of fuel due to improper timing can lead to increased fuel consumption and emissions of harmful substances.
  • Damage to other components: Improper timing may affect and damage other systems such as the ignition system and fuel injection system.

Based on the above factors, trouble code P0374 should be taken seriously and corrective action taken immediately.

What repair will help eliminate the code? P0374?

Troubleshooting DTC P0374 may include the following repair steps:

  1. Replacing the Crankshaft Position (CKP) Sensor: If the CKP sensor is faulty or gives an incorrect signal, it should be replaced with a new one. Make sure the new sensor meets the manufacturer's specifications.
  2. Checking and replacing wiring and connectors: Check the wiring and connectors connecting the CKP sensor to the ECU for corrosion, breaks or other damage. Replace damaged components if necessary.
  3. Checking the crankshaft gear or teeth: Check the condition of the crankshaft gear or teeth for damage or wear. If damage is found, replace the relevant components.
  4. Updating ECU software (firmware): Sometimes timing problems can be due to errors in the ECU software. Check for firmware updates and update if necessary.
  5. Checking and servicing other system components: Check the condition of other components of the ignition system, fuel injection system and exhaust system. Service or replace these components as necessary.
  6. Diagnosing and fixing other problems: If the P0374 trouble code persists after completing the above steps, additional diagnostics may be required to identify other potential problems.

It is important to note that in order to successfully resolve the P0374 code, you must perform diagnostics, determine the source of the problem, and perform the appropriate repairs or replacement of the faulty components. If you do not have the necessary experience or skills to perform this work yourself, it is recommended that you contact a professional auto mechanic or service center.

What is P0374 Engine Code [Quick Guide]

P0374 – Brand-specific information

Trouble code P0374 is generally a generic trouble code that can be found on various makes of vehicles. However, in some cases, some brands may use their own decodings for a given error code, several possible decodings for different brands:

These are just some examples of transcripts and may vary depending on the specific model and year of the vehicle. It is recommended that you consult your vehicle's specific owner's manual or service center for more detailed information about fault codes and their meanings for your vehicle.

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