AutoCodes – Chevrolet – P0174 2017 Chevrolet Silverado

P0174 2017 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 2017 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 470

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 2017 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 2017 Chevrolet Silverado - Fuel Trim System Lean Bank 2 - AutoCodes.com — P0174 2017 Chevrolet Silverado Code - Fuel Trim System Lean Bank 2

What does this mean?

What are the Possible Causes of the DTC P0174 2017 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 2017 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 2017 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 2017 Chevrolet Silverado Code

1. What does OBDII code P0174 on a 2017 Chevrolet Silverado indicate?

- Code P0174 means "Fuel Trim System Lean Bank 2," indicating that the engine is running too lean on bank 2 (cylinder bank that doesn't contain cylinder 1).

2. What are the common symptoms of OBDII code P0174 on a 2017 Chevrolet Silverado?

- Common symptoms include rough idle, lack of power, hesitation or stalling, poor fuel efficiency, and illuminated Check Engine Light.

3. What are the possible causes of OBDII code P0174 on a 2017 Chevrolet Silverado?

- Causes may include a vacuum leak, faulty oxygen sensor, fuel injector issues, intake air leaks, clogged fuel filter, or a malfunctioning mass airflow sensor.

4. How can I diagnose the OBDII code P0174 on a 2017 Chevrolet Silverado?

- Diagnosis involves using an OBDII scanner to retrieve the code, inspecting for vacuum leaks, checking the oxygen sensor and mass airflow sensor, and testing fuel pressure and injectors.

5. Can a dirty or clogged air filter trigger code P0174 on a 2017 Chevrolet Silverado?

- Yes, a dirty or clogged air filter can disrupt the air-fuel mixture, leading to a lean condition and triggering code P0174.

6. Is it safe to continue driving a 2017 Chevrolet Silverado with OBDII code P0174?

- It's generally not recommended to drive extensively with code P0174 as it can lead to poor engine performance and potential damage if left unresolved.

7. How can I repair OBDII code P0174 on a 2017 Chevrolet Silverado?

- Repairs may involve fixing vacuum leaks, replacing faulty oxygen sensors, cleaning or replacing the mass airflow sensor, addressing fuel delivery issues, and ensuring proper air intake.

8. Can a bad catalytic converter cause OBDII code P0174 on a 2017 Chevrolet Silverado?

- A failing catalytic converter can be a potential cause of code P0174, as it may not efficiently process the excess oxygen in a lean fuel mixture.

9. Will resetting the Check Engine Light resolve OBDII code P0174 on a 2017 Chevrolet Silverado?

- Simply clearing the code may temporarily turn off the Check Engine Light, but it won't fix the underlying issue causing code P0174. The problem should be diagnosed and repaired.

10. How can regular maintenance help prevent OBDII code P0174 on a 2017 Chevrolet Silverado?

- Regular maintenance, including air filter replacement, fuel system cleaning, and sensor inspections, can help prevent issues that may trigger code P0174 and ensure optimal engine performance.