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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Inspect and Repair Air Intake System

• Remove the air intake duct between the air filter and throttle body.
• Inspect for cracks or disconnections in hoses and the duct.
• Replace any damaged components with OEM parts.
• Reattach the duct securely to avoid air leaks.

3. Check and Clean MAF Sensor

• Locate the MAF sensor within the air intake system.
• Disconnect the electrical connector from the MAF sensor.
• Remove the sensor using the appropriate Torx or Phillips screwdriver.
• Clean the MAF sensor with MAF sensor cleaner and let it dry completely.
• Reinstall the MAF sensor and reconnect the electrical connector.

4. Test Fuel Pressure

• Connect a fuel pressure gauge to the fuel rail test port.
• Turn the ignition on (do not start the engine) and check the fuel pressure reading.
• Compare the reading with the specifications found in the service manual (usually around 50-60 psi).
• If pressure is low, check the fuel pump and fuel filter for issues; replace if necessary.

5. Inspect and Test Fuel Injectors

• Check for proper operation of fuel injectors using a multimeter or injector tester.
• Remove and clean clogged injectors using a fuel injector cleaning kit if necessary.
• Replace any malfunctioning injectors with new ones.