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P0372 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.


P0372 is a Diagnostic Trouble Code (DTC) that relates to a specific issue with the Timing Reference High-Resolution Signal “A” Too Few Pulses. This code is part of an OBDII system in modern vehicles for monitoring engine issues and reporting problems with different components, known as “OnBoard Diagnostics II”.


The P0372 code indicates that the Engine Control Module (ECM) has detected an insufficient number of pulses or signals from the Timing Reference High-Resolution Signal “A” circuit. This signal is crucial for the engine control module to be precise in timing ignition and fuel injection, which is of vital importance when it comes to good engine performance.


A P0372 code may appear as a result of several circumstances, such as:

  • A crankshaft position sensor that is broken.
  • Timing Reference High-Resolution Signal “A” circuit wiring or connection issues.
  • 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 P0372 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 P0372 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 P0372 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?

Since the P0372 code may result in reduced engine efficiency, low fuel economy, and possible damage to an engine if left untreated, immediate correction should be made. It can lead to an engine stopping or not starting at all in some cases. This is an important issue, which calls for attention.

What repairs can fix the codeS?

repair manuals

A P0372 code repair might entail:

  • If the crankshaft position sensor is determined to be broken, replace it.
  • Repair or replacement of the Timing Reference High-Resolution Signal “A” circuit’s broken wire or connections.
  • If the crankshaft or camshaft are discovered to be out of alignment, realign them.
  • Addressing any timing belts or chain problems, such as tension replacement or adjustment.
  • Occasionally, if the ECM is found to be the cause of the issue, it may need to be replaced.

Related codes

Related codes may include:

  • P0369 – Timing Reference High-Resolution Signal “A” Too Few Pulses.
  • P0370 – Timing Reference High-Resolution Signal “A” Circuit.


A DTC code P0372 indicates that there is a problem with the Timing Reference HighResolution signal “A” circuit, which can have significant effects on engine performance and efficiency. To prevent additional injury and ensure proper operation of the vehicle, quick diagnosis, and repair are necessary. Depending upon the particular cause of the code, these repairs may include replacing sensors, wires, crankshafts, or camshafts and timing components.

P0372 Code – What Does It Mean & How To Fix It