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

Learn how to diagnose and fix P0174 system 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.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Vacuum Hoses

• Locate the vacuum hoses connected to the intake manifold.
• Use a visual inspection to check for cracks or disconnections.
• If damaged, replace the hoses with OEM or high-quality aftermarket parts.
• Tighten all connections securely.

3. Clean or Replace MAF Sensor

• Locate the MAF sensor in the intake air duct.
• Disconnect the electrical connector and remove the sensor using a Torx screwdriver.
• Clean the sensor with MAF cleaner spray; avoid touching the sensor element.
• If necessary, replace the MAF sensor with a new unit.
• Reinstall the sensor and reconnect the electrical connector.

4. Check and Repair Fuel System

• Attach a fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position without starting the engine and observe the pressure reading.
• If the pressure is below manufacturer specifications, check the fuel pump and fuel filter for issues.
• Replace the fuel filter if clogged; if the pump is faulty, replace the fuel pump.

5. Clean Throttle Body

• Remove the air intake duct connected to the throttle body.
• Use throttle body cleaner and a soft cloth or brush to clean the throttle plate and surrounding area.
• Ensure that the throttle plate moves freely without sticking.
• Reassemble the air intake duct securely.