Possible causes

– Faulty spark plug 8
– Clogged or faulty fuel injector 8
– Faulty ignition coil 8
– Fuel injector 8 harness is open or shorted
– Fuel injector 8 circuit poor electrical connection
– Ignition coil 8 harness is open or shorted
– Ignition coil 8 circuit poor electrical connection
– Insufficient cylinder 8 compression
– Incorrect fuel pressure
– Intake air leak

Tech notes

The P0308 code means that the cylinder 8 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 8. If the problem persist more tests needs to be done to diagnose problem, see “Possible Causes”

When is the code detected?

Engine Cylinder 8 is Misfiring.

Symptoms

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

P0308 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.

P0308 Information for specific makes

P0308 INFINITI
P0308 NISSAN
P0308 KIA
P0308 LEXUS
P0308 TOYOTA
P0308 MITSUBISHI
P0308 AUDI
P0308 VOLKSWAGEN
P0308 GMC
P0308 CHEVROLET
P0308 PONTIAC
P0308 FORD
P0308 CADILLAC
P0308 BUICK