AutoCodes – Hummer – P1174 Hummer

P1174 Hummer 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 Hummer 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 15,493

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
FAQs
Comments
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Code P1174 Hummer 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 Hummer - Fuel Trim Cylinder Balance Bank 1 - AutoCodes.com — P1174 Hummer Code - Fuel Trim Cylinder Balance Bank 1

What does this mean?

What are the Possible Causes of the DTC P1174 Hummer?

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

How to Fix the DTC P1174 Hummer?

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 the following HUMMER models:
2003-2008 HUMMER H2
2006-2008 HUMMER H3
2003-2008 HUMMER Factory Service Bulletin OBDII Code P1174

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1174 Hummer 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 Hummer code?

Need more information on how to fix the P1174 Hummer code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1174 Hummer 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 P1174 Hummer Code

1. What is OBDII code P1174 for a Hummer, specifically related to "Fuel Trim Cylinder Balance Bank 1"?

- OBDII code P1174 in a Hummer indicates an imbalance in fuel mixture between cylinders on bank 1 of the engine.

2. What are the common symptoms of OBDII code P1174 in a Hummer?

- Common symptoms include rough idling, poor engine performance, decreased fuel efficiency, and potential stalling.

3. What are the possible causes of OBDII code P1174 in a Hummer?

- Causes may include a vacuum leak, faulty oxygen sensor, clogged fuel injectors, a malfunctioning mass airflow sensor, or issues with the fuel pressure regulator.

4. How can I diagnose OBDII code P1174 in my Hummer?

- Diagnosing this code typically involves checking for vacuum leaks, testing the oxygen sensor, inspecting fuel injectors, and ensuring proper fuel pressure.

5. Can I continue driving my Hummer with OBDII code P1174?

- It is not recommended to drive your Hummer with this code unresolved, as it can lead to further engine damage and potentially unsafe driving conditions.

6. How can I repair OBDII code P1174 in my Hummer?

- Repair options may include fixing vacuum leaks, replacing faulty sensors, cleaning or replacing fuel injectors, and addressing fuel system issues.

7. Is it possible to reset OBDII code P1174 in a Hummer without fixing the underlying issue?

- While you can clear the code with a scan tool, it will likely reappear until the root cause is identified and resolved.

8. How much does it typically cost to fix OBDII code P1174 in a Hummer?

- The cost of repairs can vary depending on the specific issue causing the code, but it is advisable to consult a mechanic for an accurate estimate.

9. Can a DIY enthusiast fix OBDII code P1174 in a Hummer?

- Depending on your mechanical skills and access to tools, some aspects of diagnosing and repairing this code may be within reach for DIY enthusiasts. However, complex issues may require professional assistance.

10. How important is it to address OBDII code P1174 promptly in a Hummer?

- It is crucial to address this code promptly to prevent further engine damage, maintain optimal fuel efficiency, and ensure safe driving conditions.