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P0300 on CHEVROLET SUBURBAN

Q: "What does P0300 mean on a CHEVROLET SUBURBAN?"

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

Q: "What are the most common causes of P0300 on CHEVROLET SUBURBAN?"

"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 CHEVROLET SUBURBAN?"

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

Q: "What should I do if my CHEVROLET SUBURBAN 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."

Random/Multiple Cylinder Misfire Detected

NHTSA Reports

Severity

Medium

Most Affected

2021, 2023

Crashes / Fires

0 / 0

Source: NHTSA Complaints Database · SAE J2012

Last reviewed: Jan 1, 0001 Last updated: Jan 1, 0001

Methodology: We combine code standards with complaint and reliability patterns, then review for clear, vehicle-first diagnosis steps.

Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).

Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.

What P0300 Means on Your CHEVROLET SUBURBAN

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 CHEVROLET SUBURBAN owners have reported this issue to NHTSA across model years 2021-2023. Most reports come from the 2021, 2023 model years. The most commonly reported component is Engine (100.0% of reports).

Real CHEVROLET SUBURBAN Owner Reports

Source: NHTSA Complaints Database

"Vehicle lost power, debris in cylinder from internal damage, crank case leaking air, oil leaking into cylinder, P0300, P0308, and P050D"

— 2021 CHEVROLET SUBURBAN owner · ENGINE · Filed 07/13/2024

"The code that originally came up was P0300 a (Engine Misfire). I had this truck for one year and it says my fuel injector went bad so I’m getting the whole Tune Up done."

— 2023 CHEVROLET SUBURBAN owner · ENGINE · Filed 01/16/2026

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

📊 Complaint Trend by Model Year

'21

'23

Common Causes on CHEVROLET SUBURBAN

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 CHEVROLET SUBURBAN? ▾

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

What are the most common causes of P0300 on CHEVROLET SUBURBAN? ▾

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 CHEVROLET SUBURBAN? ▾

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

What should I do if my CHEVROLET SUBURBAN 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.