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

Ram 1500 DT (2019-Present)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

596 words

Problem Statement

Learn how to diagnose and fix the check engine light issue on your 2019 Ram 1500 DT. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Engine

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before inspecting the exhaust system.

Symptoms

•Check engine light illuminated
•Possible rough engine idle
•Decreased fuel efficiency
•Engine stalling or hesitation during acceleration
•Unusual smells from the exhaust
•Poor engine performance under load

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific trouble codes.
2
Inspect the gas cap for damage or improper sealing, as this can trigger the check engine light.
3
Check the engine oil level and condition to ensure proper lubrication.
4
Examine the air intake system for blockages or leaks, including the air filter.
5
Inspect the exhaust system for leaks, especially around the manifold and catalytic converter.
6
Verify the functionality of the oxygen sensors and other emission control components.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Oil dipstick
•Socket set
•Screwdriver
•Multimeter
•Jack
•Jack stands

Parts Required

•Replacement gas cap
•Engine oil (as specified)
•Air filter
•Oxygen sensors (if faulty)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific trouble codes.
2
Inspect the gas cap for damage or improper sealing, as this can trigger the check engine light.
3
Check the engine oil level and condition to ensure proper lubrication.
4
Examine the air intake system for blockages or leaks, including the air filter.
5
Inspect the exhaust system for leaks, especially around the manifold and catalytic converter.
6
Verify the functionality of the oxygen sensors and other emission control components.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is off.
Disconnect the negative battery terminal for safety.

2. Address Fault Codes

Tools Required: OBD-II scanner
Connect the OBD-II scanner to the vehicle's diagnostic port.
Record any trouble codes that appear and research their meanings.
Clear the codes and check if they return after a short test drive.

3. Inspect and Replace Gas Cap

Tools Required: None
Check the gas cap for cracks or damage.
If damaged, replace the gas cap with a new one, ensuring it clicks securely when closed.

4. Check Engine Oil

Tools Required: Oil dipstick
Remove the oil dipstick and wipe it clean.
Reinsert the dipstick and remove it again to check the oil level.
If oil is low, add the correct type of engine oil as specified in the owner's manual.

5. Inspect Air Intake System

Tools Required: Socket set, screwdriver
Open the hood and visually inspect the air intake hose for cracks or loose connections.
Remove the air filter and replace it if it’s dirty or clogged.

6. Examine Exhaust System

Tools Required: Jack, jack stands, socket set
Lift the vehicle and check for exhaust leaks, particularly at joints and around the catalytic converter.
Replace any damaged gaskets or components as necessary.

7. Test Oxygen Sensors

Tools Required: Multimeter
Locate the oxygen sensors and use a multimeter to test their voltage output.
Replace any sensors that are not functioning within the manufacturer's specified range.