AutoCodes – Chevrolet – P0172 2017 Chevrolet Silverado

P0172 2017 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 2017 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 650

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 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 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 P0172 2017 Chevrolet Silverado - Fuel Trim System Rich Bank 1 - AutoCodes.com — P0172 2017 Chevrolet Silverado Code - Fuel Trim System Rich Bank 1

What does this mean?

What are the Possible Causes of the DTC P0172 2017 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 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 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 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 P0172 2017 Chevrolet Silverado Code

1. What does the OBDII code P0172 on a 2017 Chevrolet Silverado mean?

The code P0172 indicates a "Fuel Trim System Rich Bank 1" condition in the engine control module, signaling that the engine is running too rich on fuel.

2. What are the common symptoms associated with the P0172 code in a 2017 Chevrolet Silverado?

Common symptoms of the P0172 code include poor fuel economy, black smoke from the exhaust, rough idling, and a noticeable decrease in engine performance.

3. What are the possible causes of the P0172 code on a 2017 Chevrolet Silverado?

Potential causes of the P0172 code include a faulty oxygen sensor, a clogged or dirty fuel injector, a vacuum leak, a malfunctioning mass airflow sensor, or a problem with the fuel pressure regulator.

4. How can I diagnose the P0172 code on my 2017 Chevrolet Silverado?

Diagnosing the P0172 code typically involves performing a thorough inspection of the oxygen sensor, fuel injectors, air intake system, and fuel pressure regulator using a scan tool to monitor live data and identify the root cause of the rich fuel condition.

5. What are some repair tips for fixing the P0172 code on a 2017 Chevrolet Silverado?

Repair tips for addressing the P0172 code may include replacing a faulty oxygen sensor, cleaning or replacing clogged fuel injectors, fixing any vacuum leaks, cleaning the mass airflow sensor, or ensuring proper fuel pressure regulation.

6. Can driving with the P0172 code on a 2017 Chevrolet Silverado cause further damage?

Continuously driving with the P0172 code without addressing the underlying issue can potentially lead to damage to the catalytic converter, reduced engine efficiency, and increased emissions levels.

7. Is it safe to continue driving my 2017 Chevrolet Silverado with the P0172 code present?

While it may be possible to drive the vehicle with the P0172 code, it is recommended to have the issue diagnosed and repaired promptly to prevent further damage to engine components and ensure optimal vehicle performance.

8. How much does it typically cost to repair the P0172 code on a 2017 Chevrolet Silverado?

The cost of repairing the P0172 code can vary depending on the specific cause of the issue, the parts needed for replacement, and labor costs. It is advisable to consult with a certified mechanic for an accurate estimate.

9. Can I reset the P0172 code on my 2017 Chevrolet Silverado without fixing the underlying issue?

Resetting the P0172 code without addressing the root cause will only temporarily clear the code, and the issue is likely to reoccur. It is essential to diagnose and repair the problem to prevent ongoing issues.

10. How can I prevent the P0172 code from reoccurring on my 2017 Chevrolet Silverado?

To prevent the P0172 code from reoccurring, it is crucial to perform regular maintenance on your vehicle, including replacing air filters, maintaining proper fuel system hygiene, and addressing any engine issues promptly to ensure optimal fuel mixture and combustion.