P0300 on JEEP GLADIATOR — Random/Multiple Cylinder Misfire Detected

Q: "What does P0300 mean on a JEEP GLADIATOR?"

"P0300 indicates: Random/Multiple Cylinder Misfire Detected. This is a ignition system code. 6 JEEP GLADIATOR owners have reported this to NHTSA."

Q: "What are the most common causes of P0300 on JEEP GLADIATOR?"

"Based on 6 NHTSA reports, the most commonly cited components are: Engine. These percentages are based on the component field in owner complaints."

Q: "Is P0300 serious on my JEEP GLADIATOR?"

"Of 6 NHTSA reports for this code on JEEP GLADIATOR, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic."

Q: "What should I do if my JEEP GLADIATOR shows P0300?"

"1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare."

What P0300 Means on Your JEEP GLADIATOR

P0300 is a diagnostic trouble code indicating: Random/Multiple Cylinder Misfire Detected. This code relates to the ignition system system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

6 JEEP GLADIATOR owners have reported this issue to NHTSA across model years 2020. Most reports come from the 2020 model year. The most commonly reported component is Engine (100.0% of reports).

Real JEEP GLADIATOR Owner Reports

Source: NHTSA Complaints Database

"To Whom It May Concern, I hope this message finds you well. I am writing to formally report a serious mechanical failure involving my 2020 Jeep Gladiator (VIN: [XXX] ), which recently experienced a complete engine lock-up without any prior warning signs. The vehicle is now inoperable."

— 2020 JEEP GLADIATOR owner · ENGINE · Filed 07/08/2025

"To Whom It May Concern, I am writing to formally report a serious mechanical issue involving my 2020 Jeep Gladiator (VIN: [XXX] rienced a complete and unexpected engine lock-up. The vehicle is now undrivable and presents both a functional and potential safety concern."

— 2020 JEEP GLADIATOR owner · ENGINE · Filed 07/08/2025

"Error Codes P0300, 301,305, 420. Driving on the interstate I got the CEL light. One point during driving when the 420 code came in vehicle went into limp mode and speed was greatly reduced in 70 mph traffic. Luckily I was able to get to the side of the road so no accident happened."

— 2020 JEEP GLADIATOR owner · ENGINE · Filed 09/01/2022

"Starting at just over 100 miles my vehicle started displaying a electronic start/stop systems errors and the check engine light came one. the cel was caused by engine misfires and show code p0300."

— 2020 JEEP GLADIATOR owner · ENGINE · Filed 08/25/2020

"On my 2020 jeep gladiator rubicon ess and check engine light came on at 249 miles. check engine light code was p0300 multiple cylinder misfire. took it to the dealer monroe dodge and they replaced the battery for ess and did a recommended pcm flash for the check engine light."

— 2020 JEEP GLADIATOR owner · ENGINE · Filed 08/27/2020

All reports filed by vehicle owners directly with the U.S. Department of Transportation.

📊 Complaint Trend by Model Year

6

'20

Common Causes on JEEP GLADIATOR

Based on NHTSA complaint component analysis for this vehicle.

ENGINE 100%

What To Do Next

1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
2
Get a proper diagnosis
A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50–$150) pinpoints the root cause before you spend money on parts.
3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.

Frequently Asked Questions

What does P0300 mean on a JEEP GLADIATOR? ▾

P0300 indicates: Random/Multiple Cylinder Misfire Detected. This is a ignition system code. 6 JEEP GLADIATOR owners have reported this to NHTSA.

What are the most common causes of P0300 on JEEP GLADIATOR? ▾

Based on 6 NHTSA reports, the most commonly cited components are: Engine. These percentages are based on the component field in owner complaints.

Is P0300 serious on my JEEP GLADIATOR? ▾

Of 6 NHTSA reports for this code on JEEP GLADIATOR, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my JEEP GLADIATOR shows P0300? ▾

1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare.