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P0371 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.


P0371 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 the On-Board Diagnostics II (OBD-II) system used in modern vehicles to monitor and report problems with various engine components.


The P0371 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 plays a vital role in the ECM’s precise management of ignition timing and fuel injection, which is essential for proper engine performance.


A P0371 code may appear as a result of several 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 P0371 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 normally take the following actions to troubleshoot a P0371 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 P0371 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?

As P0371 may lead to a decrease in engine performance, low fuel economy, and possible damage to engines if not dealt with immediately, it is necessary to address this code promptly. This can cause your vehicle to stall or not start at all in some cases. This is an important problem and requires attention.

What repairs can fix the codeS?

repair manuals

Repairs for a P0371 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” Circuit Intermittent.
  • P0370 – Timing Reference High-Resolution Signal “A” Circuit.


A P0371 DTC code indicates that a fault in the Timing Reference High-Resolution Signal “A” circuit, which may substantially affect engine performance and efficiency, has been detected. To avoid any further damage and ensure that the vehicle functions correctly, prompt diagnosis and repair should be performed. Depending on the particular cause of the code, repairs may involve sensor replacement, transmission repair, crankshaft or camshaft alignment, and component adjustments.

P0371 Code – What Does It Mean & How To Fix It