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Engine-Codes – GMC – P1174 GMC

P1174 GMC Code - Fuel Trim Cylinder Balance Bank 1

Quick Answer

The P1174 GMC code indicates an issue with the fuel trim cylinder balance in Bank 1 of the vehicle's engine. Common causes include Faulty fuel injectors, Clogged fuel filter, Fuel pressure regulator malfunction. 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 Faulty fuel injectors, Clogged fuel filter, Fuel pressure regulator malfunction.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1174 GMC Description

The P1174 GMC code indicates an issue with the fuel trim cylinder balance in Bank 1 of the vehicle's engine. Fuel trim is a term used to describe the air-fuel mixture being delivered to the engine by the fuel injectors. When the engine control module (ECM) detects an imbalance in the fuel trim levels in Bank 1, it triggers this diagnostic trouble code (DTC). This imbalance can lead to poor engine performance, reduced fuel efficiency, and increased emissions.

OBDII Code P1174 GMC - Fuel Trim Cylinder Balance Bank 1
P1174 GMC Code - Fuel Trim Cylinder Balance Bank 1

Common Causes of P1174 GMC

  1. Faulty fuel injectors
  2. Clogged fuel filter
  3. Fuel pressure regulator malfunction
  4. Vacuum leaks in the intake system
  5. Issues with the oxygen sensor

Symptoms of P1174 GMC

  1. Rough idling
  2. Hesitation during acceleration
  3. Decreased fuel efficiency
  4. Engine misfires
  5. Check Engine Light illuminated

How to Fix P1174 GMC

  1. Diagnose the issue using a scan tool to pinpoint the exact cause of the fuel trim imbalance.
  2. Inspect and test the fuel injectors to ensure they are functioning properly. Replace any faulty injectors.
  3. Check the fuel pressure regulator and fuel filter for any obstructions or malfunctions. Replace if necessary.
  4. Inspect the intake system for vacuum leaks and repair any damaged hoses or gaskets.
  5. Clear the DTC and reset the fuel trims to ensure the issue has been resolved.

Cost to Fix P1174 GMC

The cost of repairing a P1174 GMC code can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay between $200 and $500 for parts and labor. Keep in mind that diagnostic time and labor rates can influence the final cost, so it's best to get a quote from a trusted auto repair shop in your area.

What does this mean?

Tech Notes for P1174 GMC

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

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

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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.

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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