how to fix P0171 code in Ram 1500 DT (2019-Present)

Solution

1. Preparation

• Tools Required: OBD-II scanner, fuel pressure gauge, multimeter, MAF cleaner, basic hand tools (socket set, wrenches).
• Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all air intake hoses and the intake manifold for cracks or loose connections.
  2. Tighten any loose clamps and replace any damaged hoses.
  3. Remove the air filter and inspect it for dirt; replace if necessary.

3. Check and Clean MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector from the MAF sensor.
  3. Remove the MAF sensor from its housing.
  4. Spray MAF cleaner on the sensor elements and let it dry completely before reinstalling.
  5. Reinstall the MAF sensor and reconnect the electrical connector.

4. Test Fuel Pressure

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition on (do not start the engine) and check the pressure reading; it should match the specifications in the service manual.
  3. If pressure is low, check the fuel pump, filter, and lines for blockages or failure.

5. Inspect and Test Fuel Injectors

• Sub-steps:
  1. Remove the engine cover (if applicable) to access the fuel injectors.
  2. Use a multimeter to check the electrical resistance of each injector; it should match the specified range.
  3. If an injector is faulty, replace it with a new one.

6. Clear Codes and Test Drive

• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Use the OBD-II scanner to clear any stored codes.
  3. Start the engine and take the vehicle for a test drive to ensure the code does not reappear.