AutoCodes – Chevrolet – P0171 2016 Chevrolet Silverado

P0171 2016 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 2016 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 1,217

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 2016 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 2016 Chevrolet Silverado - Fuel Trim System Lean Bank 1 - AutoCodes.com — P0171 2016 Chevrolet Silverado Code - Fuel Trim System Lean Bank 1

What does this mean?

What are the Possible Causes of the DTC P0171 2016 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 2016 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 2016 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 2016 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 2016 Chevrolet Silverado Code

1. What does OBDII code P0171 on a 2016 Chevrolet Silverado mean?

- It indicates a "Fuel Trim System Lean Bank 1" condition, meaning there is too much air and too little fuel in the air-fuel mixture in the engine's cylinders.

2. What are common symptoms of OBDII code P0171 on a 2016 Chevrolet Silverado?

- Common symptoms include rough idling, poor acceleration, engine hesitation, stalling, and possibly an illuminated check engine light.

3. What are some possible causes of OBDII code P0171 on a 2016 Chevrolet Silverado?

- Causes can include a vacuum leak, faulty oxygen sensor, dirty or clogged fuel injectors, a malfunctioning mass airflow sensor, or a weak fuel pump.

4. How can I diagnose the cause of OBDII code P0171 on my 2016 Chevrolet Silverado?

- Diagnosing the issue may involve checking for vacuum leaks, inspecting the oxygen sensor, testing the fuel injectors, cleaning the mass airflow sensor, and checking fuel pressure.

5. Can a dirty air filter cause OBDII code P0171 on a 2016 Chevrolet Silverado?

- Yes, a dirty air filter can restrict airflow to the engine, leading to a lean air-fuel mixture and triggering the P0171 trouble code.

6. How can I repair OBDII code P0171 on my 2016 Chevrolet Silverado?

- Repair options may include fixing vacuum leaks, replacing the oxygen sensor, cleaning or replacing fuel injectors, cleaning the mass airflow sensor, or addressing issues with the fuel pump.

7. Is it safe to continue driving with OBDII code P0171 on a 2016 Chevrolet Silverado?

- It is not recommended to ignore this code and continue driving, as a lean air-fuel mixture can lead to engine damage over time. It's best to address the issue promptly.

8. Can a bad catalytic converter trigger OBDII code P0171 on a 2016 Chevrolet Silverado?

- A failing catalytic converter can sometimes contribute to a lean condition and trigger the P0171 code, especially if it is clogged or not functioning properly.

9. Will resetting the check engine light resolve OBDII code P0171 on a 2016 Chevrolet Silverado?

- Resetting the check engine light may temporarily turn it off, but if the underlying issue causing the P0171 code is not addressed, the light will likely come back on.

10. How can I prevent OBDII code P0171 from recurring on my 2016 Chevrolet Silverado?

- Regular maintenance, such as changing air filters, checking for vacuum leaks, using quality fuel, and following the manufacturer's service schedule, can help prevent the code from reoccurring.