DTC P0370 Timing Reference High Resolution Signal A Malfunction

Troubleshoot On-Board Diagnostic Trouble Code P0370. As an Automotive Enthusiast and a Certified Automotive Technician, my mission is to provide you with valuable insights and practical guidance. In this article, we’ll dive into the world of On-Board Diagnostic Trouble Code P0370, which indicates a Timing Reference High Resolution Signal A Malfunction. By the end of this comprehensive guide, you’ll understand the significance of this code, be able to identify its symptoms, comprehend its potential causes, learn how to diagnose the issue, and, most importantly, discover effective strategies for fixing it..

1. What does P0370 code mean?

Let’s begin by decoding the meaning of DTC P0370. In the realm of automotive diagnostics, “P0370” is a universal code used by your vehicle’s onboard computer (OBD-II system) to communicate a specific issue. The “P” designates it as a Powertrain-related problem, typically linked to the engine or transmission. The “0370” is the unique trouble code indicating a Timing Reference High Resolution Signal A Malfunction.

In simple terms, this trouble code serves as a warning sign that there’s a malfunction in the Timing Reference High Resolution Signal A. This signal plays a crucial role in synchronizing various engine components, ensuring precise timing for optimal performance.

2. What are the causes of DTC P0370?

Now, let’s explore the potential causes behind DTC P0370:

  • Faulty Timing Reference Sensor: The sensor responsible for generating the Timing Reference High Resolution Signal A may be malfunctioning or damaged.
  • Wiring or Connector Issues: Damaged, corroded, or loose wiring and connectors in the sensor circuit can disrupt the signal.
  • Sensor Alignment Problems: Incorrect sensor installation or improper alignment can lead to signal malfunctions.
  • Power Supply Problems: Issues with the power supply to the sensor circuit can result in signal disruptions.
  • Engine Mechanical Issues: Occasionally, engine mechanical problems can indirectly affect the sensor’s performance.

3. What are the symptoms of DTC P0370?

Recognizing the symptoms associated with this trouble code is crucial for diagnosis. Common signs of DTC P0370 may include:

  • Check Engine Light (CEL): The most noticeable indicator is the illumination of the check engine light on your dashboard.
  • Engine Performance Issues: You may experience engine misfires, poor acceleration, or reduced overall performance due to timing discrepancies.
  • Occasional Difficulty Starting: Your vehicle may occasionally have trouble starting, or it might not start at all due to timing-related issues.
  • Intermittent Stalling: The engine may intermittently stall while driving or idling due to timing reference signal malfunctions.

4. How to diagnose DTC P0370?

Diagnosing DTC P0370 requires a systematic approach. Here’s a step-by-step guide:

  • Scan the Code: Use an OBD-II scanner to retrieve the trouble code and confirm the issue.
  • Inspect Wiring and Connectors: Carefully examine the wiring and connectors related to the timing reference sensor circuit for damage, corrosion, or loose connections.
  • Check Sensor Alignment: Ensure that the sensor is correctly installed and aligned to provide a consistent signal.
  • Test the Sensor: To assess the sensor’s performance, use a digital multimeter or an oscilloscope during the malfunction episodes. If your initial inspection and basic multimeter testing don’t reveal the cause of DTC P0370, specialized diagnostic equipment like an oscilloscope or advanced scan tool with live data capabilities can provide more in-depth insights into the sensor’s performance. This advanced testing allows you to detect subtle issues or intermittent faults that might not be evident through simpler diagnostic methods, helping you diagnose and resolve the problem more accurately

5. How to fix DTC P0370 problem?

Now, let’s delve into effective strategies for fixing DTC P0370:

  1. Replace the Timing Reference Sensor: If the sensor is malfunctioning or damaged, replace it with a high-quality replacement.
  2. Repair or Replace Wiring and Connectors: If you find damaged wiring or connectors intermittently causing the issue, repair or replace them as necessary.
  3. Ensure Proper Alignment: Reinstall the sensor, ensuring it’s correctly aligned with the timing reference point.
  4. Check Power Supply: Verify that the power supply to the sensor circuit is stable and within the specified range during malfunction episodes.
  5. Clear the Trouble Code: After completing the repairs, use your OBD-II scanner to clear the trouble code.
  6. Test Drive: Take your vehicle for a test drive to ensure that the issue has been successfully addressed and that the check engine light remains off.


In conclusion, DTC P0370, indicating a Timing Reference High Resolution Signal A Malfunction, can be a challenging issue to tackle. However, with the knowledge and guidance provided in this guide, you’re well-equipped to diagnose and address the issue effectively. Always prioritize safety, and if you’re uncertain, seek professional assistance. Happy troubleshooting, fellow automotive enthusiasts!