Possible causes

– Faulty spark plug 5
– Clogged or faulty fuel injector 5
– Faulty ignition coil 5
– Fuel injector 5 harness is open or shorted
– Fuel injector 5 circuit poor electrical connection
– Ignition coil 5 harness is open or shorted
– Ignition coil 5 circuit poor electrical connection
– Insufficient cylinder 5 compression
– Incorrect fuel pressure
– Intake air leak

Tech notes

The P0305 code means that the cylinder 5 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 5. If the problem persist more tests needs to be done to diagnose problem, see “Possible Causes”

When is the code detected?

Engine Cylinder 5 is Misfiring.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Lack/loss of power
– Hard start
– Engine hesitation

P0305 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.

P0305 Information for specific makes

P0305 BMW
P0305 HONDA
P0305 ACURA
P0305 JEEP
P0305 DODGE
P0305 CHRYSLER
P0305 HYUNDAI
P0305 NISSAN
P0305 INFINITI
P0305 ISUZU
P0305 KIA
P0305 LEXUS
P0305 TOYOTA
P0305 SCION
P0305 MAZDA
P0305 MITSUBISHI
P0305 SUBARU
P0305 AUDI
P0305 VOLKSWAGEN
P0305 GMC
P0305 CHEVROLET
P0305 PONTIAC
P0305 FORD
P0305 CADILLAC
P0305 BUICK
P0305 SATURN
P0305 MERCURY
P0305 1999 MERCURY VILLAGER
P0305 VOLVO
P0305 HUMMER
P0305 JAGUAR