why does my Ram 1500 DT (2019-Present) check engine light keep coming on

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Address Fault Codes

• Sub-step 1: Use the OBD-II scanner to retrieve codes and document them.
• Sub-step 2: Research the error codes to determine specific issues (e.g., P0420 for catalytic converter efficiency).

3. Inspect and Replace Components

• Sub-step 1: If the gas cap is faulty, replace it with a new one. Ensure it clicks securely.
• Sub-step 2: If air filter is dirty, remove the air filter housing, replace the air filter, and reassemble.
• Sub-step 3: Remove spark plugs using a socket wrench, inspect for wear, and replace if necessary. Torque to manufacturer specifications (usually around 13-15 lb-ft).

4. Fuel System Inspection

• Sub-step 1: Connect a fuel pressure gauge to the fuel rail. Start the engine and check if the pressure is within the manufacturer’s specification (typically 50-60 psi).
• Sub-step 2: If pressure is low, check fuel pump and fuel filter for blockages or failure; replace parts as needed.

5. Exhaust System Check

• Sub-step 1: Inspect the exhaust system visually for leaks or damage.
• Sub-step 2: If any cracks or holes are found, replace the damaged section of the exhaust.