P0305 on a Chevy: 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 P0305 means on a Chevy

On a Chevy, P0305 means the engine computer detected a misfire on cylinder 5. That cylinder is not firing cleanly, which wastes fuel and can damage the catalytic converter if ignored. Because the code names one cylinder, the cause is usually its spark plug, ignition coil, or injector.

Is P0305 common on Chevys?

P0305 shows up on Chevy V8 models like the Silverado, Tahoe, and Camaro, and on V6 models like the Traverse. Worn spark plugs and failing coil-on-plug ignition coils are the most common causes at higher mileage. Fuel injector problems are also known on GM V8 engines.

Commonly reported on: Silverado, Tahoe, Camaro, Traverse.

Symptoms

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

Common causes

most common: Worn or fouled spark plug on cylinder 5
common: Failing ignition coil on cylinder 5
less common: Clogged or leaking fuel injector
less common: Wiring or connector issue at the coil
less common: Low compression from engine wear

How to fix it

Fix	DIY?	Typical cost
Replace the spark plug on cylinder 5 (or all plugs)	Yes	$40–150
Replace the ignition coil on cylinder 5	Yes	$80–250
Replace or clean the cylinder 5 injector	Mechanic	$200–500
Run a compression test to rule out engine wear	Mechanic	$100–200

Frequently asked questions

Which Chevy models have a cylinder 5?

V8 trucks and SUVs like the Silverado and Tahoe, plus V6 models like the Traverse. Four-cylinder models set P0301–P0304 instead.

What usually causes P0305 on a Chevy?

A worn spark plug or a failing coil-on-plug ignition coil are the most common causes. GM V8s also see leaking injectors at higher mileage, which can misfire one cylinder.

Is it safe to drive my Chevy with P0305?

A steady light is usually safe for short trips. A flashing light means a severe misfire, so stop and have it towed.