how to fix Ram 1500 DT (2019-Present) check engine light staying on

Ram 1500 DT (2019-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

522 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

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

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before opening any components to avoid burns.

Symptoms

•Check engine light continuously illuminated
•Decreased fuel efficiency
•Rough idle or engine misfire
•Loss of power during acceleration
•Unusual engine noises (e.g., knocking or pinging)
•Emissions test failure

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific issues.
2
Check the vehicle's fluid levels (oil, coolant, transmission fluid) for abnormalities.
3
Inspect the gas cap for tightness or damage.
4
Examine the exhaust system for signs of leaks or blockages.
5
Test the battery voltage and connections to ensure proper power supply.
6
Inspect spark plugs and ignition coils for wear or damage.

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
•Socket set
•Torque wrench
•Screwdriver set
•Pliers

Parts Required

•Spark plugs
•Ignition coils
•Oxygen sensors (if applicable)
•Exhaust gaskets (if applicable)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific issues.
2
Check the vehicle's fluid levels (oil, coolant, transmission fluid) for abnormalities.
3
Inspect the gas cap for tightness or damage.
4
Examine the exhaust system for signs of leaks or blockages.
5
Test the battery voltage and connections to ensure proper power supply.
6
Inspect spark plugs and ignition coils for wear or damage.

Solution

1. Preparation

Gather tools and parts.
Disconnect the negative battery terminal to prevent electrical shorts.
Ensure the engine is cool before starting repairs.

2. Address Error Codes

Using the OBD-II scanner, read the error codes and note them down.
Research each code to determine the specific components that may need attention.

3. Replace Faulty Components

For damaged spark plugs or ignition coils:
- Remove the engine cover (if applicable).
- Disconnect the ignition coil connectors.
- Remove the bolts securing the coils, then lift them out.
- Replace with new coils and plugs, ensuring proper torque (typically 10-15 lb-ft for coils).
For faulty sensors (e.g., O2 sensor, MAF sensor):
- Locate the sensor based on the error code.
- Disconnect the sensor connector.
- Remove the sensor using appropriate tools (usually a wrench or socket).
- Install the new sensor and reconnect the wiring.

4. Check and Replace Exhaust Components

Inspect the exhaust system for leaks or blockages.
If necessary, replace any damaged gaskets or pipes using exhaust sealant where applicable.
Ensure all connections are tight and secure.

5. Clear Codes and Reconnect Battery

Reconnect the negative battery terminal.
Use the OBD-II scanner to clear any stored error codes.
Start the engine and monitor for the check engine light.