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how to fix P0174 code in GMC Sierra T1XX (2019-Present) - GMC Sierra
Home/Cars/GMC/Sierra/T1XX (2019-Present)/how to fix P0174 code in GMC Sierra T1XX (2019-Present)

how to fix P0174 code in GMC Sierra T1XX (2019-Present)

GMC Sierra T1XX (2019-Present)

Error Codes
2-4 hours
Time
medium
Difficulty
high
Severity
Error Code: P0174
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ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
4 min read
664 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix P0174 fuel system issue in GMC Sierra T1XX. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0174
Affected Component
Fuel System
Estimated Time
2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

  • •Disconnect the battery before working on electrical systems.
  • •Allow the engine to cool before opening the intake system.

Symptoms

  • •Check engine light illuminated
  • •Rough idle or stalling
  • •Decreased engine performance or power loss
  • •Poor fuel economy
  • •Increased emissions
  • •Engine hesitation during acceleration

Diagnostic Steps

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

  • ✓Test the affected component to ensure it functions correctly
  • ✓Check for any error codes or warning lights
  • ✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • •OBD-II scanner
  • •Fuel pressure gauge
  • •Multimeter
  • •Socket set
  • •Torque wrench
  • •MAF sensor cleaner

Parts Required

  • •Air filter
  • •Fuel filter
  • •MAF sensor (if needed)
  • •Oxygen sensor (if needed)
  • •Fuel injectors (if needed)

Additional Information

Error Code
P0174
Affected Component
Fuel System
Estimated Time
2-4 hours
Difficulty
medium
Severity
high
Tools Required
6 items
Parts Required
5 items

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Solution
1. Preparation
  • Gather all tools and parts required for the repair.
  • Disconnect the vehicle's battery to ensure safety.
  • Raise the vehicle if necessary and secure it with jack stands.
2. Inspect and Replace Air Intake Components

  • Inspect Air Filter:

    • Remove the air filter cover and check the air filter for dirt or blockages.
    • Replace the air filter if it is dirty.

  • Check for Air Leaks:

    • Inspect all hoses connected to the intake manifold for cracks or disconnections.
    • Use a smoke test or spray soapy water around the intake connections to identify leaks.
    • Replace any damaged hoses.
3. Fuel System Inspection

  • Check Fuel Pressure:

    • Connect a fuel pressure gauge to the fuel rail.
    • Turn the ignition to the "On" position without starting the engine and check the pressure.
    • Compare the reading to the manufacturer’s specifications (should be around 55-62 psi).
    • If pressure is low, inspect the fuel pump and fuel filter for issues.

  • Inspect Fuel Injectors:

    • Remove the engine cover (if applicable).
    • Check for proper operation by using a noid light or multimeter.
    • Clean or replace the fuel injectors if they are clogged.
4. MAF Sensor Cleaning or Replacement

  • Remove MAF Sensor:

    • Disconnect the electrical connector from the MAF sensor.
    • Remove the MAF sensor from the intake manifold.

  • Clean MAF Sensor:

    • Use MAF sensor cleaner to spray the sensor elements.
    • Allow the sensor to dry completely before reinstalling.

  • Replace if Necessary:

    • If cleaning does not resolve issues, replace the MAF sensor with a new one.
5. Oxygen Sensor Testing and Replacement
  • Test Oxygen Sensors:
    • Use a multimeter to test the voltage output of the downstream oxygen sensor.
    • Replace if the sensor is out of specification (typically should fluctuate between 0.1 to 0.9 volts).
6. Clear Codes and Test Drive
  • Reconnect the battery and use the OBD-II scanner to clear all error codes.
  • Conduct a test drive to monitor for any reoccurrence of the P0174 code.