AutoCodes – Chevrolet – P0171 2017 Chevrolet Silverado

P0171 2017 Chevrolet Silverado Code - Fuel Trim System Lean 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 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: P0171 2017 Chevrolet Silverado indicates Fuel Trim System Lean Bank 1.
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 1,203

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 P0171 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 P0171 2017 Chevrolet Silverado - Fuel Trim System Lean Bank 1 - AutoCodes.com — P0171 2017 Chevrolet Silverado Code - Fuel Trim System Lean Bank 1

What does this mean?

What are the Possible Causes of the DTC P0171 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
Engine Control Temperature (ECT) inaccurate readings

How to Fix the DTC P0171 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 P0171 code means that more air than gasoline is detected in the exhaust gases exiting the combustion chamber. If the P0171 is set in along with the P0174 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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0171 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.

Need more information about the P0171 2017 Chevrolet Silverado code?

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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 P0171 2017 Chevrolet Silverado Code

1. What does OBDII code P0171 on a 2017 Chevrolet Silverado mean?

- P0171 indicates a "Fuel Trim System Lean Bank 1" error, suggesting that the engine is running too lean on fuel.

2. What are common symptoms of the P0171 code in a 2017 Chevrolet Silverado?

- Symptoms may include rough idling, poor acceleration, decreased fuel efficiency, and potential stalling.

3. What are the possible causes of the P0171 code in a 2017 Chevrolet Silverado?

- Common causes include a faulty oxygen sensor, vacuum leaks, a dirty or clogged fuel filter, a failing fuel pump, or a malfunctioning mass airflow sensor.

4. How can I diagnose the P0171 code on my 2017 Chevrolet Silverado?

- Use an OBDII scanner to read the code, inspect the oxygen sensor, check for vacuum leaks, examine the air intake system, and test the fuel pressure.

5. Can I continue driving my 2017 Chevrolet Silverado with the P0171 code?

- It is not recommended to drive extensively with the P0171 code as it can lead to potential engine damage and decreased performance.

6. How can I repair the P0171 code on my 2017 Chevrolet Silverado?

- Repair options may include replacing the oxygen sensor, fixing any vacuum leaks, cleaning or replacing the fuel filter, checking the fuel pump, or replacing the mass airflow sensor.

7. Will resetting the OBDII system clear the P0171 code on my 2017 Chevrolet Silverado?

- Resetting the system may temporarily clear the code, but it will likely return if the underlying issue causing the lean condition is not addressed.

8. How much does it cost to fix the P0171 code on a 2017 Chevrolet Silverado?

- The cost varies depending on the specific cause of the code, but repairs can range from a simple fix like replacing a sensor to more extensive work like fixing a fuel pump issue.

9. Can a DIY enthusiast fix the P0171 code on a 2017 Chevrolet Silverado?

- Some causes of the P0171 code can be addressed by DIY enthusiasts with the right tools and knowledge, but more complex issues may require professional help.

10. How often does the P0171 code occur in a 2017 Chevrolet Silverado?

- The P0171 code can occur sporadically or frequently depending on the cause, driving conditions, and maintenance of the vehicle.