how to fix P0174 code in Ram 1500 DT (2019-Present)

Learn how to diagnose and fix P0174 engine lean condition in Ram 1500 DT. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Inspect and Replace Vacuum Hoses

• Sub-steps:
  1. Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
  2. Replace any damaged hoses with new ones that meet OEM specifications.
• Tools Required: Pliers, replacement vacuum hoses.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Disconnect the electrical connector from the MAF sensor.
  2. Remove the MAF sensor from the air intake duct (typically held by screws or clips).
  3. Clean using MAF sensor cleaner; do not touch the sensor elements.
  4. If heavily contaminated or damaged, replace the MAF sensor with an OEM part.
• Tools Required: Torx or socket set, MAF cleaner.

4. Check and Replace Fuel Filter (if necessary)

• Sub-steps:
  1. Locate the fuel filter in the fuel line.
  2. Relieve fuel system pressure by removing the fuel pump fuse and running the engine until it stalls.
  3. Disconnect the fuel lines from the filter (use safety glasses).
  4. Remove and replace the fuel filter with a new one.
  5. Reconnect the fuel lines and fuse, then turn the ignition to the "ON" position to prime the fuel system.
• Tools Required: Wrench set, safety glasses.

5. Perform Fuel Pressure Test

• Sub-steps:
  1. Attach the fuel pressure gauge to the fuel rail service port.
  2. Turn the ignition on without starting the engine and check the pressure reading.
  3. Compare the reading to manufacturer specifications. If low, the fuel pump may need to be replaced.
• Tools Required: Fuel pressure gauge.