P0300 on FORD MUSTANG — Random/Multiple Cylinder Misfire Detected

Q: "What does P0300 mean on a FORD MUSTANG?"

"P0300 indicates: Random/Multiple Cylinder Misfire Detected. This is a ignition system code. 4 FORD MUSTANG owners have reported this to NHTSA."

Q: "What are the most common causes of P0300 on FORD MUSTANG?"

"Based on 4 NHTSA reports, the most commonly cited components are: Engine, Unknown Or Other,Engine. These percentages are based on the component field in owner complaints."

Q: "Is P0300 serious on my FORD MUSTANG?"

"Of 4 NHTSA reports for this code on FORD MUSTANG, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic."

Q: "What should I do if my FORD MUSTANG 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 FORD MUSTANG

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.

4 FORD MUSTANG owners have reported this issue to NHTSA across model years 2018-2019. Most reports come from the 2018, 2019 model years. The most commonly reported component is Engine (75.0% of reports).

Real FORD MUSTANG Owner Reports

Source: NHTSA Complaints Database

"Random/multiple misfires and cyl 3 misfire (P0300 and P0303). Mechanic used a borescope and found coolant on the walls; visible coolant intrusion in cylinder 3. Coolant has gotten to low levels. Very rough cold start. Mechanic highly recommends to get the engine replaced."

— 2018 FORD MUSTANG owner · ENGINE · Filed 01/08/2026

"My 2018 Ford Mustang EcoBoost experienced sudden engine failure at 70,915 miles. The dealership documented misfire codes P0300, P0301, and P0316, which match the known 2.3L EcoBoost coolant-intrusion defect."

— 2018 FORD MUSTANG owner · ENGINE · Filed 11/28/2025

"Piston slap noise from engine. ticking and thudding noise from idle to 2500 rpms. can hear diesel type sound inside the car when at idle. check engine light with code p0300 for engine misfire. car is 1 year old and has oil consumption issues. dealer is of no help saying all these are normal."

— 2018 FORD MUSTANG owner · ENGINE · Filed 01/30/2019

"Began over last month with difficulty or rough engine start in mornings Then engine overheated once and continues to lose coolant without visible sign of any leakage. Scan error codes P0300, P 0303, P 0304. Now with excessive steam/smoke out tail pipe when it’s started."

— 2019 FORD MUSTANG owner · UNKNOWN OR OTHER,ENGINE · Filed 09/15/2024

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

📊 Complaint Trend by Model Year

3

'18

1

'19

Common Causes on FORD MUSTANG

Based on NHTSA complaint component analysis for this vehicle.

ENGINE 75%

UNKNOWN or OTHER,ENGINE 25%

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 FORD MUSTANG? ▾

P0300 indicates: Random/Multiple Cylinder Misfire Detected. This is a ignition system code. 4 FORD MUSTANG owners have reported this to NHTSA.

What are the most common causes of P0300 on FORD MUSTANG? ▾

Based on 4 NHTSA reports, the most commonly cited components are: Engine, Unknown Or Other,Engine. These percentages are based on the component field in owner complaints.

Is P0300 serious on my FORD MUSTANG? ▾

Of 4 NHTSA reports for this code on FORD MUSTANG, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my FORD MUSTANG 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.