The P0374: Timing Reference High Resolution Signal A No Pulses code indicates that the engine control module (ECM) is not receiving any pulses from the timing reference signal A. This signal is critical for the ECM to calculate engine timing and synchronization. No pulses from the sensor can result from a failed sensor, signal interruption, or wiring issues, and it can lead to engine performance issues such as misfires, poor performance, or stalling.
P0374 – Quick Overview
| Meaning | P0374: Timing Reference High Resolution Signal A No Pulses |
| Is it serious? | Yes, this code can cause serious engine timing issues, potentially leading to engine misfires, stalling, and poor performance if not resolved. |
| Possible causes | – Sensor failure – Signal interruption – Wiring or connection issues |
| How to diagnose? | – Test timing reference signal A – Inspect sensor and wiring – Replace or repair components as needed |
P0374 Meaning
The P0374: Timing Reference High Resolution Signal A No Pulses code means that the ECM is not receiving any pulses from the timing reference signal A. This sensor provides critical information for the ECM to manage engine timing and synchronization. Without this signal, the engine may experience rough idling, misfires, or stalling.
Step-by-step diagnostic guide
Follow these steps to diagnose and resolve the P0374 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 insight into the issue. | OBD-II Scanner |
| Inspect Timing Reference Sensor A | Visually inspect the sensor for signs of damage, wear, or corrosion. Ensure the sensor is securely mounted and properly connected. | Flashlight, Safety Gloves |
| Test Timing Reference Signal A | Use a multimeter to test the output from the timing reference signal A. Compare the results with the manufacturer’s specifications to verify if the sensor is providing any signal. | Multimeter, Manufacturer’s Specifications |
| Inspect Wiring and Connections | Inspect the wiring and connections leading to the sensor for signs of damage, loose connections, or corrosion. Repair or replace any faulty components. | Flashlight, Wiring Repair Kit |
| Replace the Sensor if Necessary | If the timing reference sensor is faulty or not providing any pulses, replace it with a new sensor to restore engine timing and synchronization. | Replacement Timing Reference Sensor, Safety Gloves |
| Clear the Code and Test Drive | After completing repairs, clear the P0374 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 P0374 code has not returned. If the code reappears, further diagnosis may be required. | OBD-II Scanner |
This diagnostic guide will help you resolve the P0374 code by ensuring that timing reference signal A provides the necessary pulses for proper engine timing and synchronization.
OBD-II scanner Buyer’s Guide
- Scanner features explained
- Different types of scanners
- Scanners for coding/odometer/ECU/checks
- Best picks + discount codes
Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)