how to fix the P0171 code on my Ram 1500 DT (2019-Present)

Solution

1. Preparation

• Gather required tools and parts.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses and connections for cracks or disconnections.
  2. Use a smoke machine or aerosol carburetor cleaner to identify leaks by spraying near suspect areas.
  3. Replace any damaged hoses or gaskets found during inspection.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Remove the MAF sensor from the air intake duct using a Torx or socket wrench.
  2. Clean the sensor using MAF cleaner spray and a soft brush.
  3. If damaged, replace the MAF sensor with a new one.
  4. Reinstall the MAF sensor and ensure all connections are secure.

4. Check Fuel Pressure

• Sub-steps:
  1. Attach a fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition to the "On" position (without starting the engine) and check the pressure reading.
  3. If the pressure is below manufacturer specifications, replace the fuel pump or fuel filter as needed.

5. Clean Throttle Body

• Sub-steps:
  1. Remove the air intake duct from the throttle body.
  2. Use throttle body cleaner and a soft cloth to clean the throttle plate and body.
  3. Ensure the throttle plate moves freely and is not sticking.
  4. Reinstall the air intake duct and ensure all clamps are tight.

6. Inspect and Test Fuel Injectors

• Sub-steps:
  1. Disconnect the fuel injector connectors and test each injector with a multimeter for resistance.
  2. If any injector is out of specification, replace it with a new injector.
  3. Reconnect the fuel injectors and connectors securely.