Is your Chevy's check engine light on and showing a P0174 code?
If so, you might be wondering what's causing the issue and how to fix it. The P0174 code indicates that the engine is running too lean, which can cause a variety of problems if left unchecked.
In this article, we'll take a deeper look at the P0174 code in your Chevy, including its common causes and potential solutions. With this information, you'll be better equipped to diagnose and repair the issue and get your Chevy running smoothly once again.
Fixing the P0174 Code with Goodhood
Once you encounter the P0174 diagnostic trouble code, you'll want to identify and address the issue as soon as possible. Thankfully, Goodhood can help diagnose and fix the problem quickly and easily.
Goodhood offers a variety of diagnostic tools that will help you pinpoint the origin of your P0174 code in your Chevy. With these tools, you can troubleshoot the engine's mechanical and electrical systems, access your vehicle's onboard diagnostics (OBD) data, and pinpoint the exact cause of the code.
Once you've identified the source of the problem, Goodhood can help you find and order the right parts to fix it. Whether it's a spark plug issue or an oxygen sensor malfunction, Goodhood has all the parts and tools you need to get your Chevy back in peak condition.
Common Causes of the P0174 Code
Faulty Mass Airflow (MAF) Sensor
A faulty MAF sensor can cause inaccurate readings of the amount of air entering the car engine, leading to a lean condition and triggering the P0174 code. Too much air enters the system, not enough fuel to keep the engine running.
Any leaks in the vacuum system, such as a cracked or disconnected vacuum hose, can cause the vehicle engine to run lean and trigger the P0174 code.
Faulty Oxygen (O2) Sensor
A faulty O2 sensor can cause inaccurate readings of the amount of oxygen in the exhaust gases, leading to a lean condition and triggering the P0174 code.
Faulty Fuel Injectors
Faulty fuel injectors can cause too little fuel to be delivered to the engine, causing a lean condition and triggering the P0174 code.
Low Fuel Pressure
Low pressure can cause a lean condition if there is not enough fuel delivered to the car engine.
Any leaks in the exhaust system can cause air to enter the system and cause inaccurate readings from the O2 sensors, leading to a lean condition and triggering the P0174 code.
Dirty or Clogged Fuel Filter
A dirty or clogged fuel filter can cause restricted fuel flow, leading to a lean condition and triggering the P0174 code.
To diagnose the cause of the P0174 code, a mechanic will typically use a scan tool to retrieve the code and any relevant data, such as freeze frame data.
They may then visually inspect the vacuum system and fuel system for any leaks or damage, check the MAF sensor and O2 sensor readings, and test the fuel injectors and fuel pressure.
Once the cause of the issue has been identified, the mechanic can then make any necessary repairs, such as replacing a faulty sensor, repairing a vacuum leak, or cleaning or replacing a clogged fuel filter.
How a Professional Mechanic Inspects and Diagnoses the P0174 Code
When a professional mechanic is presented with a vehicle displaying the P0174 code, they will generally follow a specific diagnostic process to identify the underlying cause of the problem.
Here is an overview of how a mechanic would typically inspect and diagnose the P0174 code:
Retrieving Diagnostic Trouble Codes (DTCs)
The first step is to use a scan tool to retrieve any present diagnostic trouble codes, including the P0174 code. This can provide initial information about the potential causes of the problem.
Checking Freeze Frame Data
Freeze frame data is a snapshot of the engine's operating conditions when the code has been set. A mechanic will examine this data to determine what conditions were present when the code was triggered, such as the engine RPM, vehicle speed, and coolant temperature.
The mechanic will visually inspect the engine, looking for any obvious signs of damage or wear. They will also check the vacuum hoses and lines, looking for any cracks, splits, or leaks.
Checking Fuel Pressure
The mechanic will check the fuel pressure using a fuel pressure gauge. If the fuel pressure is low, this could indicate a problem with the fuel pump or fuel filter.
Checking Oxygen (O2) Sensor
The mechanic will check the readings from the O2 sensor using a scan tool. If the readings are out of range, it could indicate a problem with the O2 sensor or the air/fuel mixture.
Checking Mass Airflow (MAF) Sensor
The mechanic will check the readings from the MAF sensor using a scan tool. If the readings are incorrect, it could indicate a problem with the MAF sensor or a problem with the air intake system.
Checking Fuel Injectors
The mechanic will check the fuel injectors to ensure they operate correctly. If a fuel injector is not working properly, it may be clogged or damaged and must be replaced.
Testing Exhaust System
The mechanic will test the exhaust system to check for any leaks. Leaks in the exhaust system can cause inaccurate readings from the O2 sensor and trigger the P0174 code.
Once the cause of the P0174 code has been identified, the mechanic will make any necessary repairs or replacements, such as replacing a faulty sensor, repairing a vacuum leak, or replacing a clogged fuel filter. They may also clear the code and test drive the vehicle to ensure the problem is resolved.
The P0174 code can be a tricky but fixable issue in your Chevy. With the help of Goodhood's diagnostic tools and parts, you can quickly diagnose and repair the problem. And with a better understanding of its common causes, you'll be better equipped to tackle this issue head-on and get your Chevy running smoothly again.
Goodhood mobile auto services are available to help you diagnose and repair any issues with your Chevy!
Frequently Asked Questions
What does the P0174 code mean in my Chevy?
The P0174 code indicates that the engine is running too lean, which can cause various problems if left unchecked.
How do I fix the P0174 code?
To fix the P0174 code, you'll need to diagnose and identify the source of the issue. With Goodhood, you can use various diagnostic tools to pinpoint the cause of the code and order the right parts to fix it.
What are some common causes of the P0174 code?
Some common causes of the P0174 code include faulty mass airflow (MAF) sensors, vacuum leaks, faulty oxygen (O2) sensors, faulty fuel injectors, low fuel pressure, exhaust leaks, and dirty or clogged fuel filters.
How does the powertrain control module (PCM) reset to fix the P0174 code?
A powertrain control module (PCM) reset is not usually enough to fix the P0174 code, as it does not address the underlying issue. A professional mechanic will need to use a scan tool to retrieve diagnostic trouble codes and pinpoint the source of the issue, then make any necessary repairs or replacements.
In some cases, a PCM reset may be required after repairs are completed in order to reset any stored codes. However, this should not be the first step taken when attempting to diagnose and repair the P0174 code.
Can I drive my Chevy with the P0174 code present?
It is not recommended to drive your vehicle with a P0174 code present, as it can cause further damage to the engine. To ensure that your vehicle runs smoothly and safely, you should have the issue diagnosed and repaired by a professional as soon as possible.