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2018
ram 150021 views

Check Engine Light On

Expert diagnosis and repair solutions for 2018 ram 1500 Check Engine Light On. Get step-by-step fixes, cost estimates, and professional advice.

Expert Repair Solutions

1
easy$10-$20
Replace or tighten the gas cap to resolve Check Engine Light due to a loose or faulty gas cap.
Source: https://www.autonationdodgeramcoloradosprings.com/service/check-engine-light.htm

Repair Steps:

  1. Inspect the gas cap for damage or looseness
  2. Tighten the gas cap securely
  3. Replace the gas cap if it appears damaged or worn
2
medium$150-$250
Replace the oxygen sensor to address Check Engine Light related to sensor failure.
Source: https://www.carhub.ca/blog/top-12-reasons-your-check-engine-light-is-on

Repair Steps:

  1. Locate the faulty oxygen sensor using a diagnostic scanner
  2. Disconnect the electrical connector
  3. Remove the old sensor using an appropriate wrench
  4. Install the new sensor and reconnect the electrical connector
3
mediumCovered under warranty
Perform a PCM software update to resolve Check Engine Light issues as recommended by TSB 18-069-20.
Source: https://static.nhtsa.gov/odi/tsbs/2025/MC-11015519-0001.pdf

Repair Steps:

  1. Visit an authorized dealer
  2. Request a PCM software update as per TSB 18-069-20
  3. Verify that the Check Engine Light issue is resolved post-update
4
hard$500-$1500
Inspect and replace the catalytic converter if necessary to resolve emissions-related Check Engine Light issues.
Source: https://www.lhmchryslerdodgeramfiatdenver.com/2018-ram-1500-check-engine-light.htm

Repair Steps:

  1. Perform an emissions test to confirm catalytic converter failure
  2. Remove the old catalytic converter
  3. Install a new catalytic converter
  4. Ensure all connections are secure and test for leaks
5
medium$300-$500
Replace the Exhaust Gas Recirculation (EGR) valve to resolve Check Engine Light issues related to EGR system faults.
Source: https://www.ram1500diesel.com/threads/ecodiesel-check-engine-light-confusion.73371/

Repair Steps:

  1. Locate the EGR valve
  2. Disconnect the battery and remove any obstructing components
  3. Remove the faulty EGR valve
  4. Install the new EGR valve and reconnect all components

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