AutoCodes – Chevrolet – P1171 Chevrolet

P1171 Chevrolet Code - Fuel System Lean During Acceleration

Quick Answer

The Powertrain Control Module (PCM) internal circuitry can identify if the vehicle fuel system is capable of supplying adequate amounts of fuel during heavy acceleration (power enrichment). Common causes include Low fuel in the fuel tank, Clogged fuel filter, Faulty Fuel Pump. 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: P1171 Chevrolet indicates Fuel System Lean During Acceleration.
Common causes: Common causes include Low fuel in the fuel tank, Clogged fuel filter, Faulty Fuel Pump.
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 20,563

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 19, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1171 Chevrolet Description

The Powertrain Control Module (PCM) internal circuitry can identify if the vehicle fuel system is capable of supplying adequate amounts of fuel during heavy acceleration (power enrichment). When a power enrichment mode of operation is requested during a Closed Loop operation (by heavy acceleration), the PCM provides additional fuel to the engine. Under these conditions, the PCM should detect a rich condition. Whenever this rich exhaust is not detected, a Diagnostic Trouble Code (DTC) P1171 sets. A plugged fuel filter or restricted fuel line can prevent adequate amounts of fuel from being supplied during power enrichment mode.

OBDII Code P1171 Chevrolet - Fuel System Lean During Acceleration - AutoCodes.com — P1171 Chevrolet Code - Fuel System Lean During Acceleration

What does this mean?

What are the Possible Causes of the DTC P1171 Chevrolet?

Low fuel in the fuel tank
Clogged fuel filter
Faulty Fuel Pump
Faulty Oxygen Sensor
Faulty Coolant Temperature Sensor
Faulty or dirty Mass Air Flow sensor

How to Fix the DTC P1171 Chevrolet?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1171 Chevrolet 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 P1171 Chevrolet code?

Need more information on how to fix the P1171 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1171 Chevrolet code diagnosed by a professional: Find a repair shop in your area

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 P1171 Chevrolet Code

1. What are the common symptoms of OBDII code P1171 (Chevrolet) indicating a fuel system lean condition during acceleration?

Symptoms may include rough idling, hesitation or jerking during acceleration, decreased fuel efficiency, and potential engine misfires.

2. What are some possible causes of OBDII code P1171 in a Chevrolet, signaling a lean fuel system under acceleration?

Potential causes may include a vacuum leak, faulty oxygen sensor, clogged fuel filter, malfunctioning mass airflow sensor, or issues with the fuel injectors.

3. How can I diagnose the OBDII code P1171 in my Chevrolet if I suspect a lean fuel system during acceleration?

Diagnosis typically involves scanning the vehicle's onboard computer for the specific fault code, checking for any visible signs of damage or leaks in the fuel system, and testing components like the oxygen sensor and mass airflow sensor.

4. Is it safe to continue driving my Chevrolet with OBDII code P1171 indicating a lean fuel system under acceleration?

It is not recommended to drive for an extended period with this code present, as it can lead to potential engine damage or further issues if left unresolved.

5. What are some repair tips for addressing OBDII code P1171 in a Chevrolet related to a lean fuel system during acceleration?

Repair tips may include inspecting and repairing any vacuum leaks, replacing faulty oxygen sensors or fuel filters, cleaning or replacing the mass airflow sensor, and ensuring proper functioning of the fuel injectors.

6. Can a DIY enthusiast fix OBDII code P1171 in a Chevrolet on their own, or is professional assistance recommended?

While some basic troubleshooting and repairs can be done by DIY enthusiasts, complex issues or component replacements may require the expertise of a professional mechanic to properly diagnose and fix the problem.

7. Are there any preventative maintenance steps I can take to avoid encountering OBDII code P1171 in my Chevrolet?

Regularly scheduled maintenance, such as replacing the fuel filter at recommended intervals, ensuring proper engine air filter cleanliness, and addressing any warning signs promptly, can help prevent issues leading to a lean fuel system.

8. How long does it typically take to repair OBDII code P1171 in a Chevrolet caused by a lean fuel system during acceleration?

The repair time can vary depending on the specific cause of the lean fuel system, ranging from a quick fix like replacing a sensor to more extensive repairs involving component testing and replacements.

9. Can extreme weather conditions or poor fuel quality contribute to triggering OBDII code P1171 in a Chevrolet related to a lean fuel system during acceleration?

Yes, extreme weather conditions affecting air density or poor fuel quality can impact the air-to-fuel ratio in the engine, potentially leading to a lean fuel system and triggering the fault code.

10. After addressing OBDII code P1171 in my Chevrolet and fixing the lean fuel system issue, is it advisable to reset the fault code and monitor for any recurring problems?

Yes, it is recommended to clear the fault code after addressing the root cause of the lean fuel system and monitor the vehicle for any reoccurrence of symptoms or fault codes to ensure the issue has been properly resolved.

1. What are the common symptoms of OBDII code P1171 on a Chevrolet related to fuel system lean during acceleration?

- Common symptoms include rough idling, hesitation or stumbling during acceleration, loss of power, and potentially poor fuel economy.

2. What are the possible causes of OBDII code P1171 Chevrolet indicating a lean fuel system during acceleration?

- Causes may include a vacuum leak, faulty oxygen sensor, clogged fuel filter, fuel pump issues, or a problem with the mass airflow sensor.

3. How can I diagnose the source of OBDII code P1171 on my Chevrolet indicating a lean fuel system?

- Diagnostic steps may involve checking for vacuum leaks, testing the oxygen sensor, inspecting the fuel filter, examining the fuel pump, and evaluating the mass airflow sensor.

4. Can a dirty or clogged fuel filter trigger OBDII code P1171 on a Chevrolet?

- Yes, a dirty or clogged fuel filter can restrict fuel flow, leading to a lean condition and triggering the P1171 code during acceleration.

5. Is it safe to continue driving my Chevrolet with OBDII code P1171 indicating a lean fuel system?

- It is not recommended to drive your vehicle with this code present, as a lean fuel system can affect engine performance and potentially lead to other issues if left unaddressed.

6. How can I reset OBDII code P1171 on my Chevrolet after addressing the lean fuel system issue?

- You can reset the code using an OBDII scanner tool or by disconnecting the battery for a few minutes. However, the code may reappear if the underlying issue is not properly resolved.

7. Can a malfunctioning oxygen sensor cause OBDII code P1171 on a Chevrolet?

- Yes, a faulty oxygen sensor can provide incorrect readings to the engine control module, leading to a lean fuel mixture and triggering the P1171 code during acceleration.

8. Are there any DIY repair tips for addressing OBDII code P1171 Chevrolet related to a lean fuel system during acceleration?

- DIY repair tips may include checking for visible vacuum leaks, inspecting and cleaning the mass airflow sensor, replacing a clogged fuel filter, or testing the oxygen sensor with a multimeter.

9. Should I seek professional help to diagnose and repair OBDII code P1171 on my Chevrolet?

- If you are not familiar with automotive diagnostics or lack the necessary tools, it is advisable to seek professional help to accurately diagnose and address the underlying cause of the lean fuel system indicated by the P1171 code.

10. Can a problem with the mass airflow sensor trigger OBDII code P1171 on a Chevrolet?

- Yes, a malfunctioning mass airflow sensor can provide incorrect air intake readings to the engine control module, resulting in a lean fuel mixture and triggering the P1171 code during acceleration.