Fix P0379: STEP-BY-STEP diagnostic GUIDE!

The P0379: Timing Reference High Resolution Signal B No Pulses code indicates that the engine control module (ECM) is not receiving any pulses from timing reference signal B. This signal is essential for accurate engine timing and synchronization. The absence of pulses can be caused by a faulty sensor, signal interruption, or wiring issues, leading to poor engine performance or stalling.

P0379 – Quick Overview

Meaning	P0379: Timing Reference High Resolution Signal B No Pulses
Is it serious?	Yes, this code can cause engine timing issues, leading to performance problems like stalling, misfires, and poor engine operation, which may cause engine damage if left unresolved.
Possible causes	– Sensor failure – Signal interruption – Wiring or connection issues
How to diagnose?	– Test timing reference signal B – Inspect sensor and wiring – Replace or repair components as needed

P0379 Meaning

The P0379: Timing Reference High Resolution Signal B No Pulses code means that the ECM is not receiving any signal pulses from timing reference signal B. This signal is vital for the ECM to manage engine timing and synchronization. Without pulses, the ECM cannot accurately calculate timing, leading to poor engine performance or stalling.

Step-by-step diagnostic guide

Follow these steps to diagnose and resolve the P0379 code by addressing potential causes one by one.

Action	Description	Tools Needed
Check for Other Codes	Use an OBD-II scanner to check for additional related codes that may provide more insights into the issue.	OBD-II Scanner
Inspect Timing Reference Sensor B	Visually inspect the sensor for signs of damage, wear, or corrosion. Ensure that the sensor is securely mounted and properly connected.	Flashlight, Safety Gloves
Test Timing Reference Signal B	Use a multimeter to test the output from timing reference signal B. Compare the readings with manufacturer’s specifications to verify if the sensor is providing any signal.	Multimeter, Manufacturer’s Specifications
Inspect Wiring and Connections	Inspect the wiring and connectors leading to the sensor for signs of fraying, corrosion, or loose connections. Repair or replace any damaged wiring or connectors as needed.	Flashlight, Wiring Repair Kit
Replace the Sensor if Necessary	If the timing reference sensor is faulty or not providing any signal, replace it with a new one to restore proper engine timing and synchronization.	Replacement Timing Reference Sensor, Safety Gloves
Clear the Code and Test Drive	After completing repairs, clear the P0379 code using an OBD-II scanner. Test drive the vehicle to ensure the problem is resolved.	OBD-II Scanner, Vehicle Owner’s Manual
Recheck for Codes	After the test drive, re-scan the vehicle to confirm that the P0379 code has not returned. If the code reappears, further diagnosis may be required.	OBD-II Scanner

This diagnostic guide will help you resolve the P0379 code, ensuring that timing reference signal B provides the necessary pulses for proper engine timing and synchronization.