AutoCodes – Chevrolet – P0172 2014 Chevrolet Silverado

P0172 2014 Chevrolet Silverado Code - Fuel Trim System Rich Bank 1

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 Faulty Mass Air Flow (MAF) Sensor, Intake Air Leaks, Exhaust Gas 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: P0172 2014 Chevrolet Silverado indicates Fuel Trim System Rich Bank 1.
Common causes: Common causes include Dirty or Faulty Mass Air Flow (MAF) Sensor, Intake Air Leaks, Exhaust Gas 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 1,730

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jul 23, 2023

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0172 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 P0172 2014 Chevrolet Silverado - Fuel Trim System Rich Bank 1 - AutoCodes.com — P0172 2014 Chevrolet Silverado Code - Fuel Trim System Rich Bank 1

What does this mean?

What are the Possible Causes of the DTC P0172 2014 Chevrolet Silverado?

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

How to Fix the DTC P0172 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 P0172 code means that more gasoline is detected in the exhaust gases exiting the combustion chamber. If the P0172 is set in along with the P0175 code, it is highly likely that the problem is caused by leaking fuel injectors. If there are no leaking fuel injectors, 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 P0172 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 P0172 2014 Chevrolet Silverado Code

What does the OBDII code P0172 mean on a 2014 Chevrolet Silverado?

The P0172 code indicates that the fuel mixture in Bank 1 is running too rich, meaning there's too much fuel or not enough air in the combustion process.

What are common symptoms of the P0172 code in a 2014 Chevrolet Silverado?

Symptoms may include reduced fuel economy, black smoke from the exhaust, rough idling, hesitation during acceleration, and the check engine light turning on.

What causes the P0172 code in a 2014 Chevrolet Silverado?

Common causes include a faulty mass air flow (MAF) sensor, dirty or clogged air filter, leaking fuel injectors, a malfunctioning fuel pressure regulator, or a defective oxygen sensor.

Can a dirty air filter cause the P0172 code on a 2014 Silverado?

Yes, a clogged air filter can restrict airflow, resulting in a rich fuel mixture and triggering the P0172 code.

How can I diagnose the P0172 code on my 2014 Silverado?

Start by checking the MAF sensor, air filter, and oxygen sensors for issues. Use a scan tool to monitor fuel trim readings and inspect for vacuum leaks or fuel system problems.

Can a bad oxygen sensor trigger the P0172 code in a 2014 Chevrolet Silverado?

Yes, a faulty oxygen sensor can send incorrect data to the engine control module (ECM), causing it to miscalculate the air-fuel ratio and trigger the P0172 code.

Is it safe to drive with the P0172 code on a 2014 Chevrolet Silverado?

Driving with this code may be possible in the short term, but it can lead to reduced performance, poor fuel economy, and potential engine damage if not addressed promptly.

How can I fix the P0172 code on my 2014 Silverado?

Potential fixes include cleaning or replacing the MAF sensor, replacing the oxygen sensor, cleaning the air filter, repairing fuel injector leaks, or addressing fuel pressure issues.

Can a vacuum leak cause the P0172 code on a 2014 Chevrolet Silverado?

While vacuum leaks typically cause a lean condition, they can indirectly contribute to a rich condition if they affect sensor readings or fuel trims.

What tools do I need to fix the P0172 code in a 2014 Silverado?

You may need a scan tool or code reader, a multimeter, and basic tools like wrenches and screwdrivers to inspect and replace components like the MAF sensor or oxygen sensors.