AutoCodes – Chevrolet – P0174 2015 Chevrolet Silverado

P0174 2015 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 2015 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.

Save to My Repairs Step-by-Step Diagnostic Guide My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,330

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0174 2015 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 2015 Chevrolet Silverado - Fuel Trim System Lean Bank 2 - AutoCodes.com — P0174 2015 Chevrolet Silverado Code - Fuel Trim System Lean Bank 2

What does this mean?

What are the Possible Causes of the DTC P0174 2015 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 2015 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 2015 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.

Need more information about the P0174 2015 Chevrolet Silverado code?

Need more information on how to fix the P0174 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0174 2015 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 2015 Chevrolet Silverado Code

1. What does OBDII code P0174 on a 2015 Chevrolet Silverado mean?

The code P0174 indicates a lean condition in the fuel trim system on bank 2 of the engine in your 2015 Chevrolet Silverado.

2. What are the common symptoms of OBDII code P0174 on a 2015 Chevrolet Silverado?

Common symptoms of code P0174 include rough idling, decreased fuel efficiency, loss of power, and possible engine misfires.

3. What are the possible causes of OBDII code P0174 on a 2015 Chevrolet Silverado?

Potential causes of code P0174 include a vacuum leak, faulty oxygen sensor, clogged fuel filter, fuel pump issues, intake air leaks, or a malfunctioning mass airflow sensor.

4. How can I diagnose OBDII code P0174 on a 2015 Chevrolet Silverado?

To diagnose code P0174, you can start by checking for vacuum leaks, inspecting the oxygen sensor, testing the fuel pressure, examining the mass airflow sensor, and scanning for other potential issues in the fuel delivery system.

5. Can driving with OBDII code P0174 on a 2015 Chevrolet Silverado cause further damage?

Continuing to drive with code P0174 can potentially lead to damage to the catalytic converter and other engine components due to the lean fuel mixture.

6. How can I repair OBDII code P0174 on a 2015 Chevrolet Silverado?

Repairing code P0174 typically involves addressing the root cause, such as fixing vacuum leaks, replacing faulty sensors, cleaning or replacing filters, and ensuring proper fuel system function.

7. Is it safe to reset the OBDII code P0174 on a 2015 Chevrolet Silverado without fixing the underlying issue?

Resetting the code without fixing the underlying problem is not recommended, as the issue will likely persist, potentially leading to further complications and affecting the vehicle's performance.

8. How much does it cost to repair OBDII code P0174 on a 2015 Chevrolet Silverado?

The cost of repairing code P0174 can vary depending on the specific cause and needed repairs, but it may range from a few hundred to a thousand dollars, including parts and labor.

9. Can a DIY enthusiast fix OBDII code P0174 on a 2015 Chevrolet Silverado?

Depending on the individual's mechanical skills and tools available, some DIY enthusiasts may be able to address code P0174 by following repair guides, but complex issues may require professional assistance.

10. How often does OBDII code P0174 occur in a 2015 Chevrolet Silverado?

The occurrence of code P0174 can vary depending on maintenance, driving conditions, and other factors, but once diagnosed, it should be promptly addressed to prevent further complications.