how to solve the issue with Ram 1500 DT (2019-Present) check engine light codes

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

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, multimeter, smoke machine (if checking for leaks).
• Instructions:
  1. Park the vehicle on a level surface and engage the parking brake.
  2. Disconnect the negative battery terminal to ensure safety while working.

2. Addressing Specific Codes

• Instructions:
  1. Based on the OBD-II scan results, identify the top code(s) that are causing the check engine light.
  2. For codes related to the oxygen sensor (e.g., P0131), replace the affected sensor by:
     • Locating the sensor in the exhaust system.
     • Disconnecting the wiring harness.
     • Using a socket wrench to unscrew the old sensor and installing the new one.
     • Torque the new sensor to the manufacturer's specification (usually around 30 ft-lbs).
  3. For codes indicating misfires (e.g., P0300), inspect and replace faulty spark plugs or ignition coils as follows:
     • Remove the engine cover (if applicable) using a socket set.
     • Disconnect the ignition coil connectors and remove the coils.
     • Replace spark plugs using a spark plug socket, ensuring the gap is set to specification.
     • Reinstall coils and reconnect connectors.

3. Clearing Codes

• Instructions:
  1. Reconnect the negative battery terminal.
  2. Use the OBD-II scanner to clear the trouble codes from the vehicle’s memory.

4. Test Drive

• Instructions:
  1. Start the vehicle and allow it to reach normal operating temperature.
  2. Take the vehicle for a test drive under various conditions (city and highway) to ensure the check engine light remains off.