P0374 DTC Code: Everything You Need to Know


In the world of automobiles, diagnostic trouble codes (DTC) play a crucial role in identifying the source of a problem. If you have encountered the P0374 DTC code, you may be wondering what it means and how it affects your vehicle’s performance. This comprehensive guide will delve deep into the details of the P0374 code, explaining its significance, symptoms, potential causes, and possible solutions.

Understanding the P0374 DTC Code

The P0374 DTC code specifically relates to the crankshaft position sensor “B” circuit intermittent. This code is often found in vehicles with an OBD-II system, which monitors various components and systems to identify malfunctions or abnormalities. When the crankshaft position sensor fails to provide accurate data or experiences intermittent issues, the vehicle’s powertrain control module (PCM) records the P0374 code.

Symptoms of the P0374 DTC Code

When your vehicle triggers the P0374 code, you may notice a variety of symptoms that can indicate a faulty crankshaft position sensor. These symptoms can include:

  1. Engine Misfires: The engine may misfire or hesitate during acceleration or at idle.
  2. Poor Fuel Efficiency: You may experience a decrease in fuel efficiency due to the inaccurate engine timing caused by a faulty sensor.
  3. Difficulty Starting the Engine: The engine may take longer to start, or you may encounter issues starting it altogether.

If you notice any of these symptoms or if your vehicle’s check engine light illuminates, it is crucial to address the issue promptly to prevent further damage and potential safety risks.

Potential Causes of the P0374 DTC Code

Several factors can contribute to the activation of the P0374 code, ranging from minor issues to more significant problems. Here are some potential causes to consider:

  1. Faulty Crankshaft Position Sensor: The most common cause of the P0374 code is a malfunctioning or worn crankshaft position sensor.
  2. Wiring or Connection Issues: Loose or damaged wiring, poor connections, or corroded terminals can disrupt the sensor’s signal, leading to an intermittent circuit.
  3. Issues with the PCM: Rarely, a faulty powertrain control module can incorrectly interpret sensor data, triggering the P0374 code.

To determine the exact cause, it is advisable to perform a thorough diagnosis using specialized tools and equipment or seek assistance from a qualified mechanic.

Diagnosing and Resolving the P0374 DTC Code

With the complexity of modern vehicle systems, diagnosing and resolving the P0374 code requires systematic troubleshooting. Here are some steps that may help in resolving the issue:

  1. Scan the DTC Codes: Use an OBD-II scanner to retrieve the specific DTC codes, including the P0374 code. This step allows you to identify other associated codes and potential system malfunctions.
  2. Inspect the Sensor and Wiring: Visually inspect the crankshaft position sensor and its wiring for any signs of damage, looseness, or corrosion. Repair or replace any faulty components as necessary.
  3. Check Electrical Connections: Ensure all electrical connections related to the crankshaft position sensor are secure and free of debris. Clean or reconnect any loose connections.
  4. Perform Sensor Testing: Use a multimeter or specialized diagnostic tools to test the resistance, voltage, and signal output of the crankshaft position sensor. Compare the results with the manufacturer’s specifications to determine if the sensor requires replacement.
  5. Address PCM Issues: If all other potential causes have been ruled out, consider the possibility of a malfunctioning powertrain control module. Consult a professional technician who can conduct advanced diagnostics on the PCM and determine the appropriate course of action.

Frequently Asked Questions (FAQs):

1. What does the P0374 DTC code mean?

The P0374 code refers to the crankshaft position sensor “B” circuit intermittent. When this code is triggered, it indicates an issue with the sensor’s signal, potentially causing engine misfires, starting difficulties, and decreased fuel efficiency.

2. Can I drive my vehicle with the P0374 DTC code?

While it may be possible to continue driving your vehicle with the P0374 code, it is highly recommended to address the underlying issue promptly. Ignoring the problem can lead to more severe engine damage and increased safety risks. It is best to have your vehicle inspected and repaired by a qualified mechanic.

3. How much does it cost to fix the P0374 DTC code?

The cost of fixing the P0374 code can vary depending on the root cause and the vehicle’s make and model. Generally, the expenses may include diagnostic fees, replacement parts (if necessary), and labor costs. It is advisable to consult with a mechanic or service center to obtain an accurate estimate based on your specific circumstances.


The P0374 DTC code, associated with the intermittent “B” circuit of the crankshaft position sensor, requires attention to prevent further engine malfunctions. By understanding the symptoms, potential causes, and diagnostic steps outlined in this guide, you are better equipped to address the issue promptly and ensure the optimal performance of your vehicle. If you are unsure or uncomfortable diagnosing and fixing the problem yourself, it is always advisable to seek assistance from a qualified automotive professional.

About author


Meet Sam Mitchell, your experienced and reliable guide in the complex world of car fault codes. With a robust career spanning over 15 years as a professional car mechanic, John has the skills, knowledge, and practical experience to help you navigate car fault issues with confidence.


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