AutoCodes – Buick – P1174 Buick

P1174 Buick Code - Fuel Trim Cylinder Balance Bank 1

Quick Answer

The Fuel Trim Cylinder Balance diagnostic detects a rich or lean cylinder to cylinder air/fuel ratio imbalance in each bank. Common causes include Clogged Fuel Injectors, Faulty Oxygen sensor, Ignition problem. 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: P1174 Buick indicates Fuel Trim Cylinder Balance Bank 1.
Common causes: Common causes include Clogged Fuel Injectors, Faulty Oxygen sensor, Ignition problem.
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 9,281

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 04, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
Comments
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Code P1174 Buick Description

The Fuel Trim Cylinder Balance diagnostic detects a rich or lean cylinder to cylinder air/fuel ratio imbalance in each bank. The diagnostic monitors the pre-catalyst heated oxygen sensor (HO2S) signal's frequency and amplitude characteristics by calculating an accumulated voltage over a predetermined sample period. An imbalance is indicated when multiple samples of the accumulated voltage are consistently higher than the desired value.

OBDII Code P1174 Buick - Fuel Trim Cylinder Balance Bank 1 - AutoCodes.com — P1174 Buick Code - Fuel Trim Cylinder Balance Bank 1

What does this mean?

What are the Possible Causes of the DTC P1174 Buick?

Clogged Fuel Injectors
Faulty Oxygen sensor
Ignition problem
Fuel injection problem
Engine mechanical condition

How to Fix the DTC P1174 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 does this mean?

Code Tech Notes

The P1174 code sometimes is triggered by clogged fuel injectors. Start by using high octane fuel and/or fuel additive to clean injectors. If the problem persists fuel injectors may need to be replaced.

There is a Factory Service Bulletin for all 2000-2013 Buick models:
2000-2013 Buick Factory Service Bulletin OBDII Code P1174

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1174 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 P1174 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.