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

Learn how to diagnose and fix P0174 engine lean condition in Ram 1500 DT (2019-Present). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to avoid electrical shorts.
• Allow the engine to cool down before starting the repair.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps, engine cleaner
• Use a vacuum gauge to check for leaks in the intake system.
• Spray engine cleaner around suspected leak areas while the engine is running; if idle changes, a leak is confirmed.
• Replace or tighten any loose or damaged hoses and gaskets.

3. Clean MAF Sensor

• Tools Required: MAF sensor cleaner
• Disconnect the MAF sensor connector and remove it from the assembly.
• Spray MAF sensor cleaner on the sensing element and allow it to dry completely before reinstallation.

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Attach the fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position (without starting the engine) and check the pressure; it should match manufacturer specifications (usually around 58-65 psi for Ram 1500).
• If pressure is low, inspect the fuel pump and filter.

5. Inspect Fuel Injectors

• Tools Required: Multimeter, injector cleaner
• Use a multimeter to check the resistance of each fuel injector. It should typically be around 12-16 ohms.
• If any injector is faulty, replace it. Clean injectors using an injector cleaning kit if necessary.

6. Replace ECT Sensor (if necessary)

• Tools Required: Socket set, coolant catch pan
• Locate the ECT sensor, typically near the thermostat housing.
• Disconnect the electrical connector and unscrew the sensor.
• Install the new sensor, ensuring a proper seal with new O-ring and refill coolant as necessary.