How much does it cost to fix P0305 on a Chevy?

Repair costs for P0305 on Chevy vehicles typically range from $150 to $600 depending on the underlying cause. The most common fix is: Failed or heat-degraded ignition coil on cylinder 5.

Chevy Check Engine Code

P0305 on Chevy

Cylinder 5 Misfire Detected

Severity: high DIY difficulty: 2/5 Chevy cost: $150–$600

Last updated April 30, 2026 Also covers: Chevrolet, GMC, Buick, Cadillac, GM

P0305 on Chevy: what makes it different

On Chevy V8 trucks and SUVs built around the small-block LS/Vortec family, P0305 flags a misfire isolated to cylinder 5. These engines use a coil-near-plug ignition design where each cylinder has its own coil, so a single bad coil or plug on one cylinder is a very common and fairly easy-to-isolate failure.

Most-affected engines

5.3L Vortec/EcoTec3 V8 (Silverado, Tahoe, Suburban)
6.0L Vortec V8 (Silverado HD, Suburban, Yukon XL)
LS-series V8 (Corvette, Camaro SS)

Common model years: 1999–2014 (classic Gen III/IV small block), with similar patterns continuing in later EcoTec3 trucks

Most likely cause on Chevy

Failed or heat-degraded ignition coil on cylinder 5

Known Chevy engine-family issues

GM V8 trucks equipped with Active Fuel Management (cylinder deactivation) can produce intermittent or rotating misfires tied to lifter wear, which sometimes gets misread as a single-cylinder ignition problem. Separately, individual ignition coil failure is a well-known wear item on these engines independent of AFM.

Chevy-specific causes (most common first)

Individual ignition coil failure — GM coil-on-plug units fail one at a time rather than as a set
Worn or fouled spark plug past service interval
Clogged or weak fuel injector on cylinder 5
Intake manifold gasket leak causing a localized lean condition (common on plastic intake manifolds)
Lifter collapse related to Active Fuel Management (cylinder deactivation) on AFM-equipped V8s
Corroded or loose wiring connector at the cylinder 5 coil

Chevy-specific diagnostic tip

Swap the coil from cylinder 5 with a known-good coil from another cylinder. If the misfire code follows the coil to its new position, you've confirmed an ignition coil issue. If the misfire stays on cylinder 5, move on to checking the injector, compression, and (on AFM engines) lifter condition.

Symptoms drivers report

CEL
Rough idle
Loss of power

Typical repair cost on Chevy

Most Chevy owners fix P0305 for between $150 and $600, depending on which underlying cause turns out to be at fault. Start with the most-likely cause for your vehicle — Failed or heat-degraded ignition coil on cylinder 5 — before throwing parts at it.

Chevy P0305 FAQ

Why does my Chevy truck only misfire on cylinder 5 and not others?

Because each cylinder has its own independent ignition coil, a single coil or plug can fail while the rest keep working fine, producing a misfire code for just that one cylinder.

Is P0305 related to Active Fuel Management on my Chevy V8?

It can be. If your engine has AFM/cylinder deactivation and the misfire is intermittent or load-dependent, a collapsed lifter on that cylinder's bank is worth checking alongside the ignition components.

Do I need to replace all 8 coils if one fails?

Not necessarily — GM coils typically fail individually, so replacing just the bad one is usually sufficient unless others are also showing wear or age-related cracking.