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2021
ram 150020 views

Check Engine Light On

Expert diagnosis and repair solutions for 2021 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 caused by a loose or faulty gas cap.
Source: https://www.billesteschryslerdodgejeepram.com/2021-ram-1500-check-engine-light.htm

Repair Steps:

  1. Inspect the gas cap for damage
  2. If damaged, purchase a new gas cap
  3. Tighten the gas cap securely
2
mediumFree under recall 23V265000
Update the Powertrain Control Module (PCM) software to address engine stall issues related to incorrect fuel mixture.
Source: https://static.nhtsa.gov/odi/tsbs/2025/MC-11015519-0001.pdf

Repair Steps:

  1. Schedule an appointment with a certified dealer
  2. Have the dealer perform the PCM software update
  3. Test drive the vehicle to ensure the issue is resolved
3
hard$500-$1000
Replace the high pressure fuel pump to prevent engine stalls caused by pump failure.
Source: https://www.autonationdodgeramcoloradosprings.com/service/check-engine-light.htm

Repair Steps:

  1. Confirm the issue with a diagnostic scan
  2. Order a replacement high pressure fuel pump
  3. Have a certified technician replace the fuel pump
  4. Verify the repair by monitoring for any further check engine light alerts
4
medium$200-$400
Inspect and replace the Motor Generator Unit (MGU) connector if not fully seated, as per TSB 08-014-21.
Source: https://static.nhtsa.gov/odi/tsbs/2025/MC-11015519-0001.pdf

Repair Steps:

  1. Check the MGU connector for proper seating
  2. Replace the MGU if necessary
  3. Clear any diagnostic trouble codes (DTCs) related to the issue
5
medium$150-$300
Address rough engine running and misfire by splicing in a pigtail to the engine ground harness as per TSB 0810921.
Source: https://static.nhtsa.gov/odi/tsbs/2025/MC-11015519-0001.pdf

Repair Steps:

  1. Cut off the wiring harness eyelet
  2. Splice in a new pigtail to the engine ground harness
  3. Test the engine for smooth operation and clear any DTCs

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