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

Learn how to diagnose and fix P0174 engine too 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 ensure safety.
• Allow the engine to cool down before starting work.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge
• Steps:
  1. Remove the engine cover if applicable.
  2. Inspect all air intake hoses for cracks or disconnections. Replace any damaged hoses.
  3. Tighten any loose clamps.
  4. Reinstall the engine cover if removed.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner or isopropyl alcohol, soft cloth
• Steps:
  1. Locate the MAF sensor within the air intake duct.
  2. Disconnect the electrical connector from the MAF sensor.
  3. Remove the sensor from its housing using the appropriate socket.
  4. Clean the sensor gently with MAF cleaner and allow it to dry completely.
  5. Reinstall the MAF sensor and reconnect the electrical connector.

4. Check Fuel System

• Tools Required: Fuel pressure gauge, socket set
• Steps:
  1. Locate the fuel pressure test port on the fuel rail.
  2. Attach the fuel pressure gauge to the test port.
  3. Turn the ignition key to the "ON" position (do not start) and check the fuel pressure reading. Ensure it meets manufacturer specifications (typically around 50-60 psi for Ram 1500).
  4. If pressure is low, inspect the fuel pump and replace the fuel filter if necessary.

5. Inspect Exhaust System

• Tools Required: Socket set, flashlight
• Steps:
  1. Visually inspect the exhaust manifold and pipe for any cracks or loose connections.
  2. Pay special attention to the areas near the O2 sensors.
  3. Repair or replace any damaged components.

6. Clear Codes and Test Drive

• Tools Required: OBD-II scanner
• Steps:
  1. Reconnect the negative battery terminal.
  2. Use the OBD-II scanner to clear the P0174 code from the ECM.
  3. Take the vehicle for a test drive to ensure the engine runs smoothly and the check engine light does not reappear.