OBD-II Code P0316 — What It Means & How to Fix It

What Does This Error Mean?

P0316 means the PCM detected a misfire during the first 1,000 revolutions after startup. This is a startup-specific misfire code — it captures misfires that happen right when the engine first fires up. You may notice the engine shaking, stumbling, or running rough for a few seconds after cold starts. It often accompanies a specific cylinder misfire code like P0301 or P0302.

Affected Models

All 1996+ gasoline vehicles
Very common in Ford vehicles with coil-on-plug ignition systems
Common in GM vehicles with LS and Ecotec engines
Common in any vehicle with worn spark plugs or coils
Common in vehicles that sit unused for extended periods

Common Causes

Worn or fouled spark plugs that struggle to fire under the rich cold-start fuel mixture
Weak ignition coil that fails to deliver adequate energy when the engine is cold
Clogged fuel injector causing lean misfire on startup before the engine reaches temperature
Low fuel pressure from a weak fuel pump not building pressure quickly enough at startup
Carbon deposits on intake valves (common in direct-injection engines) causing rough startup

How to Fix It

Check for companion misfire codes stored alongside P0316. Look for P0301 through P030X, which will tell you which cylinder is misfiring on startup. P0316 alone without a cylinder code means the misfire was brief and did not point to one specific cylinder.

P0316 is often the first code to appear when ignition components are starting to fail. Other codes like P0301 may appear later as the problem worsens.
Inspect and replace the spark plugs if they are near or past their service interval. Cold starts demand more from the ignition system due to the richer air-fuel mixture. Worn plugs that fire adequately when warm may misfire during cold cranking.

Check your owner's manual for the recommended plug replacement interval. Many modern vehicles specify 60,000-100,000 miles for iridium or platinum plugs.
Test the ignition coils by swapping any suspect coil with a known-good coil from another cylinder. Clear the codes and observe which cylinder the startup misfire code moves to. If it follows the coil, replace the coil.

Coils that test fine at room temperature can fail under the electrical load of cold cranking. This is called a thermally intermittent fault.
On direct-injection engines (GDI), check for intake valve carbon deposits. These engines do not wash the intake valves with fuel, so carbon accumulates over time. Heavy deposits can prevent proper valve sealing and cause misfires during cold starts.

Walnut blasting or chemical intake cleaning can remove carbon deposits. This service is common on BMW, VW, Audi, Ford EcoBoost, and GM direct-injection engines.
Check fuel pressure during cranking. The pump should build pressure within the first second of cranking. Low initial fuel pressure from a worn pump or leaking pressure regulator can cause a momentary lean condition that misfires during the first few hundred RPM.

Listen for the fuel pump priming hum when you first turn the key to ON before cranking. A weak or silent pump may be causing the startup lean condition.

When to Call a Professional

If new spark plugs and coils do not resolve P0316, suspect a fuel delivery or mechanical issue. Low compression on one cylinder causes a cold misfire that goes away as the engine warms up. A shop can perform a compression test and check fuel pressure at startup. Diagnosis typically costs $80-$130. Intake valve carbon cleaning on GDI engines may cost $200-$400.

Frequently Asked Questions

Is P0316 serious if the engine smooths out after a few seconds?

It is worth investigating even if the engine smooths out quickly. A startup misfire means something is not working right when cold. Ignoring it means the problem will likely worsen over time. Prolonged misfires also wear out the catalytic converter. Fix the underlying cause before it gets more expensive.

Why does a misfire only happen when the engine is cold?

Cold engines run a richer air-fuel mixture to compensate for poor fuel vaporization. This places higher demands on the ignition system. Weak coils, worn plugs, and partly clogged injectors may handle warm conditions fine. But they struggle under the cold-start load and misfire. As the engine warms up and the mixture leans out, the misfire disappears.

Does P0316 always come with another misfire code?

Not always, but it usually does. If the misfire only lasted a few firing events, the PCM may not have pinpointed the cylinder. In that case, only P0316 is stored. If the misfire was consistent enough on one cylinder, you will see both P0316 and a cylinder-specific code like P0301.