Fix P0371: STEP-BY-STEP diagnostic GUIDE!

The P0371: Timing Reference High Resolution Signal A Too Many Pulses code indicates that the engine control module (ECM) is receiving too many pulses from the timing reference signal A. This signal helps manage engine timing and synchronization, and too many pulses can result from a faulty sensor, wiring issues, or signal processing errors.

P0371 – Quick Overview

Meaning	P0371: Timing Reference High Resolution Signal A Too Many Pulses
Is it serious?	Yes, this code can lead to engine timing issues, causing performance problems such as misfires, rough idling, or stalling if left unresolved.
Possible causes	– Signal processing error – Faulty sensor – Wiring or connection issues
How to diagnose?	– Test timing reference signal A – Inspect sensor and wiring – Replace or repair components as needed

P0371 Meaning

The P0371: Timing Reference High Resolution Signal A Too Many Pulses code means that the ECM is detecting an abnormally high number of pulses from timing reference signal A. This signal is essential for managing engine timing and synchronization, and too many pulses can lead to engine misfires, poor performance, or incorrect timing adjustments.

Step-by-step diagnostic guide

Follow these steps to diagnose and resolve the P0371 code by addressing potential causes one by one.

Action	Description	Tools Needed
Check for Other Codes	Use an OBD-II scanner to check for other related codes that may provide further insight into the issue.	OBD-II Scanner
Inspect Timing Reference Sensor A	Visually inspect the sensor for signs of damage, corrosion, or wear. Ensure it is properly mounted and securely connected.	Flashlight, Safety Gloves
Test Timing Reference Signal A	Use a multimeter to measure the signal from timing reference signal A. Compare the readings to the manufacturer’s specifications to confirm proper operation.	Multimeter, Manufacturer’s Specifications
Inspect Wiring and Connections	Check the wiring and connectors leading to the timing reference sensor for signs of loose connections, damaged wires, or corrosion. Repair or replace as needed.	Flashlight, Wiring Repair Kit
Replace the Sensor if Necessary	If the timing reference sensor is faulty or providing too many pulses, replace it with a new one to ensure proper timing signal output.	Replacement Sensor, Safety Gloves
Clear the Code and Test Drive	After completing repairs, clear the P0371 code using an OBD-II scanner. Test drive the vehicle to ensure the issue is resolved.	OBD-II Scanner, Vehicle Owner’s Manual
Recheck for Codes	After the test drive, re-scan the vehicle to ensure the P0371 code has not returned. If the code reappears, further diagnosis may be required.	OBD-II Scanner

This diagnostic guide will help you address the P0371 code, ensuring that timing reference signal A functions properly and the ECM can correctly manage engine timing and synchronization.