P0301 - Cylinder 1 Misfire Detected

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What does this mean?
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Possible causes
- Faulty spark plug 1
- Clogged or faulty fuel injector 1
- Faulty ignition coil 1
- Fuel injector 1 harness is open or shorted
- Fuel injector 1 circuit poor electrical connection
- Ignition coil 1 harness is open or shorted
- Ignition coil 1 circuit poor electrical connection
- Insufficient cylinder 1 compression
- Incorrect fuel pressure
- Intake air leak
What does this mean? What does this mean?
Tech notes
The P0301 code means that the cylinder 1 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 1. If the problem persist more tests needs to be done to diagnose problem, see "Possible Causes"
What does this mean? What does this mean?
When is the code detected?
Engine Cylinder 1 is misfiring.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/loss of power
- Hard start
- Engine hesitation
P0301 Description

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.

P0301 Information for specific makes
P0301 ACURA Cylinder Number 1 Misfire Detected
P0301 AUDI Cylinder 1 Misfire Condition
P0301 BMW Misfire cylinder 1
P0301 BUICK Cylinder 1 Misfire Detected
P0301 CADILLAC Cylinder 1 Misfire Detected
P0301 CHEVROLET Cylinder 1 Misfire Detected
P0301 CHRYSLER Cylinder Misfire Fault Detected
P0301 DODGE Cylinder Misfire Fault Detected
P0301 FORD Cylinder 1 Misfire Detected  P0301 Video
P0301 GMC Cylinder 1 Misfire Detected
P0301 HONDA Cylinder Number 1 Misfire Detected
P0301 HUMMER Cylinder 1 Misfire Detected
P0301 HYUNDAI Cylinder 1 Misfire Detected
P0301 INFINITI Number 1 Cylinder Misfire Detected
P0301 ISUZU Cylinder Number 1 Misfire Detected
P0301 JAGUAR Cylinder 1 Misfire Detected
P0301 JEEP Cylinder Misfire Fault Detected
P0301 KIA Cylinder 1 Misfire Detected
P0301 LEXUS Cylinder 1 Misfire Detected
P0301 MAZDA Cylinder 1 Misfire Condition Detected
P0301 MERCEDES-BENZ Cylinder 1 Misfire Detected
P0301 MERCURY Cylinder 1 Misfire Detected
P0301 MITSUBISHI Cylinder 1 Misfire Condition
P0301 NISSAN Number 1 Cylinder Misfire Detected
P0301 PONTIAC Cylinder 1 Misfire Detected
P0301 SATURN Cylinder 1 Misfire Detected
P0301 SCION Cylinder 1 Misfire Detected
P0301 SUBARU Cylinder 1 Misfire Detected
P0301 TOYOTA Cylinder 1 Misfire Detected
P0301 VOLKSWAGEN Cylinder 1 Misfire Condition
P0301 VOLVO Cylinder 1 Misfire Condition
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Repair Importance Level: 3
 
1=Low 2=Medium 3=High What does this mean?
Repair Difficulty Level: 3
 
1=Easy 2=Moderate 3=Hard What does this mean?
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