P0300 Infiniti Code - Cylinder Misfire Detected Random Cylinders
Quick Answer
When a misfire occurs, engine speed will fluctuate. Common causes include Faulty spark plug (s), Faulty ignition coil (s), Clogged or faulty fuel injector (s). Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0300 Infiniti indicates Cylinder Misfire Detected Random Cylinders.
- Common causes
- Common causes include Faulty spark plug (s), Faulty ignition coil (s), Clogged or faulty fuel injector (s).
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0300 Infiniti Description
What are the Possible Causes of the DTC P0300 Infiniti?
- Faulty spark plug (s)
- Faulty ignition coil (s)
- Clogged or faulty fuel injector (s)
- Intake air leak
- Fuel injectors harness is open or shorted
- Fuel Injectors circuit poor electrical connection
- Ignition coils harness is open or shorted
- Ignition coils circuit poor electrical connection
- Insufficient cylinders compression
- Incorrect fuel pressure
How to Fix the DTC P0300 Infiniti?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0300 Infiniti code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P0300 Infiniti code?
Need more information on how to fix the P0300 Infiniti code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0300 Infiniti code diagnosed by a professional: Find a repair shop in your area
Information for Specific Infiniti Models
- P0300 2003 Infiniti G35 — Cylinder Misfire Detected Random Cylinders
- P0300 2004 Infiniti G35 — Cylinder Misfire Detected Random Cylinders
- P0300 2005 Infiniti G35 — Cylinder Misfire Detected Random Cylinders
- P0300 2006 Infiniti G35 — Cylinder Misfire Detected Random Cylinders
Frequently Asked Questions about P0300 Infiniti Code
1. What are common symptoms of an OBDII code P0300 in an Infiniti?
- Common symptoms include rough idling, engine misfires, loss of power, and potential stalling.
2. What are the possible causes of a P0300 code in an Infiniti?
- Possible causes include faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, low fuel pressure, or issues with the engine's compression.
3. How can I diagnose the source of a cylinder misfire detected on random cylinders in my Infiniti?
- You can diagnose the issue by performing a thorough inspection of the spark plugs, ignition coils, fuel system, vacuum lines, and checking for any exhaust leaks.
4. Can a dirty or clogged fuel injector cause a P0300 code in an Infiniti?
- Yes, a dirty or clogged fuel injector can disrupt the fuel-air mixture, leading to misfires and triggering the P0300 code.
5. Is it safe to continue driving my Infiniti if it has a P0300 code?
- It is not recommended to continue driving with a P0300 code as it can lead to further damage to the engine and potentially cause other issues.
6. How can I prevent a cylinder misfire detected on random cylinders in my Infiniti?
- Regular maintenance, such as replacing spark plugs, ignition coils, and fuel filters as recommended by the manufacturer, can help prevent cylinder misfires.
7. Can a P0300 code be triggered by a failing ignition coil in an Infiniti?
- Yes, a failing ignition coil can cause uneven sparks, leading to misfires and triggering the P0300 code.
8. Are there any DIY repair tips for fixing a P0300 code in an Infiniti?
- DIY repair tips include checking and replacing spark plugs, inspecting ignition coils, cleaning fuel injectors, and ensuring proper fuel pressure.
9. How much does it typically cost to repair a P0300 code in an Infiniti?
- The cost of repairing a P0300 code can vary depending on the specific cause, but it may range from a few hundred to a few thousand dollars, depending on the extent of the repairs needed.
10. Can a P0300 code in an Infiniti be reset without fixing the underlying issue?
- While you can clear the code temporarily, it is important to address the underlying issue causing the misfires to prevent further damage to the engine.
Discuss the causes and fixes for P0300 Infiniti OBDII Code
-
Great details to correct hesitation (usually 3 tries) to start my 2001 Infiniti QX4.
-
Same problem here. Runs great cold. When at normal operatimg temp and accelerating the QX4 seems to lag. what I mean is it kinda surges.It's like you have power then you don't then you do, then you don't and so on and so on. It does have power. At idle it misses bad but revs perfect and idles at 750 like it should, but the cil flashes. I know that's bad so I avoid red lights. When the cil flashes raw fuel enters the cat and sooner or later if not fixed it will melt you cat converter. Sometimes the cil will go out on its on if I can avoid having to set at a red light or in traffic where it has to idle for a few driving cycles. New plugs, factory Nissan distributor, plug wires, throttle body gasket, upper plenum gasket.Checked fuel pressure all good. Also when setting the timing @ 15 BTD it idles rough but when I turn the distributor and advance the timing it runs a lot better. Why???? Ive been chasing this code for a year now. I also cleaned the fuel rail and the injectors. I noticed on the injectors that 3 on 1 side have the same numbers on them and the other side have different numbers but all three have the same.HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-
Have you checked if the catalytic converters are already damage? From what you explained, sounds like the cats are bad. One indication is that only happens when the engine is warm up.
-
hello, with me it is like that: after starting the car, everything seems to be ok. When increasing the idle speed also. The problem starts when I go around 3000-5000 rpm then. min the "check engine" lamp lights up and blinks. Feel that the car breaks and finally goes into emergency mode. In emergency mode the ignition does not fall out (oddly), but rpm goes only to 3500.
Replaced:
-at catalysts
-4 lambda probe
- evap filter (leak was)I am slowly running out of ideas ... please help
-
What model and year is your Infiniti?
Sounds like you may have a problem with the fuel injectors. You could try using a fuel injector cleaner or high octane gas for a couple of weeks to see if that make any difference.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
