P0300 on NISSAN ALTIMA — Random/Multiple Cylinder Misfire Detected

Q: "What does P0300 mean on a NISSAN ALTIMA?"

"P0300 indicates: Random/Multiple Cylinder Misfire Detected. This is a ignition system code. 2 NISSAN ALTIMA owners have reported this to NHTSA."

Q: "What are the most common causes of P0300 on NISSAN ALTIMA?"

"Based on 2 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 NISSAN ALTIMA?"

"Of 2 NHTSA reports for this code on NISSAN ALTIMA, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic."

Q: "What should I do if my NISSAN ALTIMA 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 NISSAN ALTIMA

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.

2 NISSAN ALTIMA owners have reported this issue to NHTSA across model years 2009-2014. Most reports come from the 2009, 2014 model years. The most commonly reported component is Engine (100.0% of reports).

Real NISSAN ALTIMA Owner Reports

Source: NHTSA Complaints Database

"Carbon build-up on valves causing misfire and the break down of the catalyst. codes p0300 and p0303 stored in ecm. required replacement of long engine assembly and exhaust manifold. initially, dealership cited need to replace ignition coil, software update, fuel line flush."

— 2009 NISSAN ALTIMA owner · ENGINE · Filed 01/22/2018

"My check engine light came on today. took my car to baker nissan dealership for them to put it on diagnostic machine. i was charged $135. no work was done since i am out of warranty and extended warranty. they told me the engine was misfiring. two codes appeared p0304 and p0300."

— 2014 NISSAN ALTIMA owner · ENGINE · Filed 12/11/2017

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

📊 Complaint Trend by Model Year

1

'09

1

'14

Common Causes on NISSAN ALTIMA

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 NISSAN ALTIMA? ▾

P0300 indicates: Random/Multiple Cylinder Misfire Detected. This is a ignition system code. 2 NISSAN ALTIMA owners have reported this to NHTSA.

What are the most common causes of P0300 on NISSAN ALTIMA? ▾

Based on 2 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 NISSAN ALTIMA? ▾

Of 2 NHTSA reports for this code on NISSAN ALTIMA, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my NISSAN ALTIMA 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.