1. Home
  2. /
  3. Complete List of OBD2...
  4. /
  5. P0370 Code – What...

P0370 Code – What Does It Mean & How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.


P0370 is a Diagnostic Trouble Code (DTC) that pertains to a specific issue with the Timing Reference High-Resolution Signal “A” Circuit. This code is part of the On-Board Diagnostics II (OBD-II) system used in modern vehicles to monitor and report problems with various engine components.


The code P0370 indicates that an error in the Timing Reference High-Resolution Signal “A” circuit has been encountered by the Engine Control Module ECM. This signal is important for the ECM to be able to accurately monitor timing and fuel injection, which play a key role in proper engine performance.


A P0370 code may appear as a result of many circumstances, such as:

  • A crankshaft position sensor that is broken.
  • Issues with the Timing Reference High-Resolution Signal “A” circuit’s wiring or connectors.
  • A crankshaft or camshaft with damage or alignment issues.
  • Problems with the timing chain or belt.
  • Rarely, there are ECM problems.


Common symptoms associated with a P0370 code may include:

  • Illumination of the Check Engine Light (CEL) on the dashboard.
  • Reduced engine performance or power.
  • Poor fuel efficiency.
  • Engine misfires or rough idling.
  • Stalling or difficulty starting the engine.
  • Abnormal engine noise.


A mechanic or technician will often take the following actions to troubleshoot a P0370 code:

  • To get the code and any associated codes, use an OBD-II scanner.
  • Check the wiring and the Timing Reference High-Resolution Signal “A” circuit for any obvious damage.
  • To check if the crankshaft position sensor is working properly, measure its voltage and resistance.
  • Verify the crankshaft and camshaft’s alignment.
  • Check the chain or timing belt for optimum tension and wear.
  • To see whether the problem reappears, clear the code and give it a test run.

Common mistakes

Common mistakes when dealing with a P0370 code include:

  • Replacing the sensor without checking the wiring and connectors for issues.
  • Neglecting to inspect the crankshaft and camshaft alignment.
  • Assuming the code is solely caused by a faulty sensor without considering other potential causes.

How serious is this?

The P0370 code needs to be resolved without delay, because it may lead to diminished engine performance, low fuel economy, and possible engine damage if the issue is not addressed. It may cause the engine to stall or even not start at all in some cases. It’s a very important issue, and we have to pay attention.

What repairs can fix the codeS?

repair manuals

Repairs for a P0370 code may include:

  • Replacing the crankshaft position sensor if it’s found to be faulty.
  • Repairing or replacing damaged wiring or connectors in the Timing Reference High-Resolution Signal “A” circuit.
  • Realigning the crankshaft or camshaft if they are found to be misaligned.
  • Addressing any issues with the timing belt or chain, such as tension adjustment or replacement.
  • In rare cases, replacing the ECM if it’s determined to be the source of the problem.

Related codes

Related codes may include:

  • P0369 – Timing Reference High-Resolution Signal “A” Too Many Pulses.
  • P0371 – Timing Reference High-Resolution Signal “A” Too Few Pulses.


The P0370 DTC code indicates that there is a problem with the timing reference high-resolution signal “A” circuit, which can significantly affect engine performance and efficiency. To avoid further damage and ensure the proper operation of your vehicle, you must have a timely diagnosis and repair. Depending on the exact cause of the code, repairs can include the replacement of sensors, connecting devices, crankshafts, camshafts, or timing components.

P0370 Code – What Does It Mean & How To Fix It