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AutoCodes – GMC – P1174 GMC

P1174 GMC 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 GMC 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 50,149
How popular is this code, among other codes? Medium
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Table of contents Created and updated by William Orellana on Jul 04, 2020
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Code P1174 GMC 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 GMC - Fuel Trim Cylinder Balance Bank 1 - AutoCodes.com
P1174 GMC Code - Fuel Trim Cylinder Balance Bank 1
What does this mean?

What are the Possible Causes of the DTC P1174 GMC?

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

How to Fix the DTC P1174 GMC?

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 GMC models:
2000-2013 GMC Factory Service Bulletin OBDII Code P1174

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1174 GMC 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 GMC code?

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

Need Help with the Code?

Get the P1174 GMC 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 GMC Code

1. What does the OBDII code P1174 mean on a GMC vehicle?

P1174 indicates "Fuel Trim Cylinder Balance Bank 1," meaning the engine control module (ECM) has detected an imbalance in fuel delivery between the cylinders on Bank 1.

2. What are common symptoms of code P1174 in a GMC?

Common symptoms include rough idling, decreased fuel efficiency, engine hesitation, misfires, or the check engine light turning on.

3. What causes the P1174 code to appear on a GMC?

Potential causes include a malfunctioning fuel injector, vacuum leaks, a dirty or failing mass airflow sensor, clogged fuel lines, or issues with the oxygen sensor.

4. Can a dirty mass airflow sensor trigger the P1174 code?

Yes, a dirty or faulty mass airflow sensor can cause inaccurate air-fuel mixture readings, leading to an imbalance and triggering the P1174 code.

5. How is the P1174 code diagnosed on a GMC?

A mechanic will use a scan tool to confirm the code, check live data for fuel trim imbalances, inspect fuel injectors, sensors, and perform a smoke test for vacuum leaks.

6. What repairs can fix the P1174 code on a GMC?

Repairs may include cleaning or replacing fuel injectors, fixing vacuum leaks, replacing the mass airflow sensor, or repairing a damaged oxygen sensor.

7. Is it safe to drive a GMC with the P1174 code?

Driving with this code may be safe temporarily, but prolonged issues can cause engine damage, reduced performance, and poor fuel economy. Prompt diagnosis is recommended.

8. Can low fuel pressure cause the P1174 code?

Yes, low fuel pressure from a failing fuel pump, clogged fuel filter, or damaged fuel pressure regulator can cause an imbalance in cylinder fuel delivery.

9. How much does it cost to fix the P1174 code on a GMC?

Repair costs vary depending on the cause but typically range from $150 to $500, including diagnostics, cleaning, or replacing parts like injectors or sensors.

10. Can a misfire trigger the P1174 code on a GMC?

Yes, a cylinder misfire can disrupt fuel trim balance, potentially triggering the P1174 code. Misfires should be addressed to resolve the issue.

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