AutoCodes – Chevrolet – P0174 2014 Chevrolet Silverado

P0174 2014 Chevrolet Silverado Code - Fuel Trim System Lean Bank 2

Quick Answer

The Engine Control Module (ECM) controls a Closed Loop air/fuel metering system to provide the best possible combination of drivability, fuel economy, and emission control. Common causes include Dirty or Restricted Air Filter, Dirty or Faulty Mass Air Flow (MAF) Sensor, Intake Air Leaks. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0174 2014 Chevrolet Silverado indicates Fuel Trim System Lean Bank 2.
Common causes: Common causes include Dirty or Restricted Air Filter, Dirty or Faulty Mass Air Flow (MAF) Sensor, Intake Air Leaks.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,103

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 21, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0174 2014 Chevrolet Silverado Description

The Engine Control Module (ECM) controls a Closed Loop air/fuel metering system to provide the best possible combination of drivability, fuel economy, and emission control. The ECM monitors the Heated Oxygen Sensor (HO2S) signal voltage and adjusts the fuel delivery based on the signal voltage while in Closed Loop. A change made to the fuel delivery changes the long and short-term fuel trim values. The short-term fuel trim values change rapidly in response to the HO2S signal voltages. These changes fine-tune the engine fueling. The long-term fuel trim values change in response to trends in the short-term fuel trim. The long-term fuel trim makes coarse adjustments to fueling to re-center and restore control to short-term fuel trim. The ideal fuel trim values are around 0 %. A positive fuel trim value indicates that the ECM is adding fuel to compensate for a lean condition. A negative fuel trim value indicates that the ECM is reducing the amount of fuel to compensate for a rich condition. The Diagnostic Trouble Code (DTC) will be set when the average long-term fuel trim weighted average value is greater or less than a calibrated value.

OBDII Code P0174 2014 Chevrolet Silverado - Fuel Trim System Lean Bank 2 - AutoCodes.com — P0174 2014 Chevrolet Silverado Code - Fuel Trim System Lean Bank 2

What does this mean?

What are the Possible Causes of the DTC P0174 2014 Chevrolet Silverado?

Dirty or Restricted Air Filter
Dirty or Faulty Mass Air Flow (MAF) Sensor
Intake Air Leaks
Exhaust Gas Leaks
Fuel Contamination
Faulty or Clogged Fuel Injectors
Faulty Front Heated Oxygen Sensor
Ignition Misfiring
Low Fuel Pressure
Positive Crankcase Ventilation (PCV) Hose Leaks

How to Fix the DTC P0174 2014 Chevrolet Silverado?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

The P0174 code means that more air than gasoline is detected in the exhaust gases exiting the combustion chamber. If the P0174 is set in along with the P0171 code, it is highly likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the Mass Air Flow (MAF) Sensor. If the problem persists the MAF or Front Heated Oxygen (O2) Sensor will need to be replaced.

Click Here to Learn What is Bank 1 and Bank 2

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0174 2014 Chevrolet Silverado code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0174 2014 Chevrolet Silverado Code

What does the OBDII code P0174 mean on a 2014 Chevrolet Silverado?

P0174 indicates that the air-fuel mixture on Bank 2 of the engine is too lean, meaning there is too much air and not enough fuel.

What are the common symptoms of a P0174 code on a 2014 Silverado?

Symptoms may include poor fuel economy, rough idling, engine stalling, hesitation during acceleration, and the check engine light illuminating.

What are the most common causes of a P0174 code?

Common causes include vacuum leaks, a dirty or faulty mass airflow (MAF) sensor, clogged fuel injectors, a weak fuel pump, or an exhaust leak near Bank 2.

Can a dirty mass airflow (MAF) sensor trigger a P0174 code?

Yes, a dirty or faulty MAF sensor can misread the airflow entering the engine, causing the air-fuel mixture to become too lean and triggering the code.

How do I check for vacuum leaks that might cause a P0174 code?

Inspect vacuum hoses, intake manifold gaskets, and PCV valves for cracks or loose connections. You can also use a smoke test to detect leaks.

Is it safe to drive with a P0174 code on my Silverado?

While the vehicle may still be drivable, continuing to drive with a lean condition can cause engine damage over time. It's best to address the issue promptly.

How can I fix a P0174 code on a 2014 Chevrolet Silverado?

Fixes may include cleaning or replacing the MAF sensor, repairing vacuum leaks, replacing faulty oxygen sensors, or addressing issues with the fuel system like clogged injectors or a weak fuel pump.

Can a bad oxygen sensor cause a P0174 code?

Yes, a faulty oxygen sensor on Bank 2 can send incorrect readings to the engine control module, leading to a lean condition and triggering the code.

How can I clean a mass airflow (MAF) sensor to resolve a P0174 code?

Remove the MAF sensor carefully and clean it using a specialized MAF sensor cleaner. Avoid using other cleaners, as they can damage the sensor.

What diagnostic tools can help identify the cause of a P0174 code?

A scan tool with live data capabilities can help monitor fuel trim, MAF sensor readings, and oxygen sensor performance. A smoke machine can also be used to find vacuum leaks.