AutoCodes – Buick – P1171 Buick

P1171 Buick 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 Buick 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 4,547

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
Comments
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Code P1171 Buick 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 Buick - Fuel System Lean During Acceleration - AutoCodes.com — P1171 Buick Code - Fuel System Lean During Acceleration

What does this mean?

What are the Possible Causes of the DTC P1171 Buick?

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 Buick?

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 Buick 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 Buick 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.