P0306 on a Volkswagen: Causes, Fixes & Repair Cost

🟠 Moderate severity · drivable

If the check engine light is flashing, stop driving — a severe misfire can damage the catalytic converter. A steady light is usually safe for a short drive to a shop.

What P0306 means on a Volkswagen

On a Volkswagen, P0306 means the engine computer detected that cylinder 6 is misfiring, so that cylinder is not firing and producing power on schedule. It only appears on VW six-cylinder models like the VR6 and Atlas V6, which use one ignition coil per cylinder. A flashing light means the misfire is severe enough to risk catalytic converter damage.

Is P0306 common on Volkswagens?

P0306 shows up on Volkswagen six-cylinder models like the Passat and Golf with the VR6 engine, plus the Touareg and Atlas V6. Ignition coils and spark plugs are the usual causes, and VR6 coils are a well-known wear item as the engine ages. Vacuum leaks from cracked intake hoses and engine wear are less common causes.

Commonly reported on: Passat, Golf, Touareg, Atlas.

Symptoms

Check engine light on (flashing if severe)
Rough idle or shaking while idling
Loss of power or hesitation under load
Poor fuel economy

Common causes

most common: Failing ignition coil on cylinder 6
common: Worn or fouled spark plug in cylinder 6
common: Vacuum leak from a cracked intake hose
less common: Clogged or leaking fuel injector on cylinder 6
rare: Low compression in cylinder 6 from engine wear

How to fix it

Fix	DIY?	Typical cost
Replace the ignition coil on cylinder 6	Yes	$80–350
Replace worn spark plugs	Yes	$60–250
Find and repair vacuum leaks	Yes	$10–150
Run a compression test to rule out internal engine wear	Mechanic	$100–200