The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

Articles

2019 Chrysler 300 P0300 Code Symptoms: Diagnosis & Fixes

By ClearTheCode · Published 2026-05-30 · ~4 min read

Experiencing 2019 Chrysler 300 P0300 code symptoms? Learn how to diagnose common misfire causes and find effective solutions to get your 300 running smoothly again.

At a glance

Difficulty
6/10 — Moderate
Est. repair cost
$100 – $900 (parts + typical shop labor)
OEM tooling
Standard OBD-II scanner and hand tools
Common symptoms
  • Illuminated Check Engine Light: This is almost always the first indicator. If the misfire is severe
  • the light may flash
  • Rough Idle: The engine may shake or vibrate more than usual when stopped or in park
  • feeling like it's struggling to sta
  • Reduced Engine Power: You might notice a significant decrease in acceleration and overall responsiveness
  • making highway

If your 2019 Chrysler 300 has suddenly developed a rough idle, noticeable hesitation during acceleration, or a general lack of power, you're likely experiencing the common 2019 Chrysler 300 P0300 code symptoms. This diagnostic trouble code (DTC) indicates a "Random/Multiple Cylinder Misfire Detected," meaning the engine's computer (PCM) has identified that one or more cylinders are not firing correctly, but it hasn't yet pinpointed a specific cylinder. While the P0300 code itself doesn't specify which cylinder is misfiring, it's a critical warning sign that your engine's combustion process is compromised, potentially leading to reduced performance, decreased fuel efficiency, and even catalytic converter damage if left unaddressed. Understanding these symptoms and knowing how to approach the diagnosis is the first step toward restoring your 300's smooth operation.

What Drivers Notice On This 2019 Chrysler 300

When a P0300 code triggers on your 2019 Chrysler 300, the most immediate and concerning sign is often the illumination of the Check Engine Light. Beyond that, the driving experience can quickly deteriorate. You might find your luxury sedan feeling less refined, struggling to maintain speed, or even stalling at low RPMs. This isn't just an annoyance; it can impact fuel economy and potentially lead to more serious engine damage if ignored. The vehicle's behavior can range from subtle hiccups to severe drivability issues, making it clear that something is amiss under the hood.

At a glance: difficulty, repair cost, and diagnostic workflow

  • Difficulty Rating: 6/10 — Moderate
  • Common Symptoms: Illuminated Check Engine Light: This is almost always the first indicator. If the misfire is severe, the light may flash; Rough Idle: The engine may shake or vibrate more than usual when stopped or in park, feeling like it's struggling to sta; Reduced Engine Power: You might notice a significant decrease in acceleration and overall responsiveness, making highway; Engine Hesitation or Stumbling: The vehicle may momentarily lose power or feel like it's
  • Estimated Repair Cost: $100–$900 (parts + typical shop labor)
  • OEM Tooling Required: Standard OBD-II scanner and hand tools

Diagnostic workflow:

  1. Confirm the symptom on your vehicle.
  2. Scan for stored or pending codes with an OBD-II tool.
  3. Inspect the most common causes in this guide (visual checks first).
  4. Run verification tests before replacing parts.
  5. Repair, clear codes, and verify on a test drive.

Symptoms and Warning Signs

Recognizing the specific symptoms associated with a P0300 code is crucial for timely diagnosis and repair. On your 2019 Chrysler 300, these can include:

  • Illuminated Check Engine Light: This is almost always the first indicator. If the misfire is severe, the light may flash, indicating a condition that could damage the catalytic converter.
  • Rough Idle: The engine may shake or vibrate more than usual when stopped or in park, feeling like it's struggling to stay running.
  • Reduced Engine Power: You might notice a significant decrease in acceleration and overall responsiveness, making highway merging or uphill climbs challenging.
  • Engine Hesitation or Stumbling: The vehicle may momentarily lose power or feel like it's

This guide is not a substitute for OEM service procedures; use a qualified technician for safety-critical repairs.

Frequently asked questions

How urgent is this problem?

If symptoms are worsening or safety systems are affected, diagnose soon; minor issues can often wait for a scheduled service visit.

Can I drive with this issue?

Short trips may be acceptable for some faults, but stop driving if you notice overheating, loss of braking, steering problems, or strong fuel smells.

Do I need a dealer scan tool?

A basic OBD-II scanner helps confirm codes; some steps still need visual checks and meter tests described above.

Helpful links

On ClearTheCode

Cited catalog sources

Have a different issue? Calculate your repair cost

Menu

Help & account