What does P0316 mean?
The ECM detected one or more misfires within the first 1,000 revolutions after startup, before specific cylinder data was conclusive — usually accompanied or followed by a P030x cylinder-specific code.
Quick Decision Guide
- Worn or fouled spark plugs (common in vehicles overdue for service)
- Weak ignition coil that breaks down only when cold
- Leaking or slow-opening fuel injector
When to stop driving
If the check-engine light flashes during startup or driving, stop driving as soon as it is safe — flashing indicates active misfire, which can rapidly damage the catalytic converter. A solid light with smooth running is less urgent but should be diagnosed within a week.
Reviewed by ratchit Automotive Solutions for clarity and inspection-first safety framing. Not a substitute for professional diagnosis.
Repair Decision & Cost Guide
Use this guide to decide what to inspect first, what it may cost, and when to move from DIY checks to professional diagnosis.
P0316 points to a misfire condition, not a guaranteed failed coil or plug. Isolate the failing cylinder before buying parts.
DIY vs. Shop
Can you keep driving?
Best first DIY check
Don't replace this first
When to seek a shop
Recommended next action
Estimated Repair Cost
Inspection cost
$0–$25 DIY scanner
Shop diagnostic cost
$80–$150 (typical shop diagnostic fee)
Shop repair cost
$100–$700
Diagnostic uncertainty: This code points to a system or condition, not a guaranteed failed part. Inspect before replacing.
Cost variation: Costs vary by vehicle, location, part quality, labor rate, and the confirmed root cause.
Inspect Before Replacing
These checks are cheap, fast, and rule out the most common causes before spending money on parts.
- 1Scan for any companion P030x cylinder-specific codes — they pinpoint which cylinder is misfiring.
- 2Note vehicle mileage and last spark-plug service. Plugs and coils are the most common root cause.
Track this misfire issue
Save this issue to My Garage, track what you inspect, and build service history for this vehicle.
V-IQ readiness preview: Medium impact — resolving and tracking this issue may improve your V-IQ readiness. Tracking active codes and resolutions builds a service history we use to estimate V-IQ readiness over time.
Understanding P0316 in detail
P0316 is a 'startup misfire' history code. The engine control module monitors crankshaft acceleration during the first 1,000 revolutions after the engine starts. If the variation between cylinder firing events exceeds the expected threshold, P0316 is set as a generic flag while the ECM gathers more data. In most cases, a specific cylinder code (P0301–P0308) is set alongside or shortly after P0316 once the ECM identifies which cylinder is dropping. Common root causes are cold-start specific: weak ignition coils that work warm but break down cold, fouled or worn spark plugs, fuel injectors that leak down overnight or open slowly when cold, low fuel pressure during cranking, or a stretched timing chain causing a cam/crank correlation drift. Because P0316 is often the only code stored at first, it is easy to dismiss — but it is a leading indicator and should be inspected before a full misfire develops. If the check-engine light flashes during startup or driving, stop driving immediately — flashing means active misfire is occurring, which can damage the catalytic converter.
Symptoms of P0316
- Check engine light on (often after a cold start)
- Brief rough idle or stumble at startup that smooths out
- Hesitation pulling away from a cold start
- Companion P030x cylinder-specific misfire codes
- Slightly longer cranking before start
Common causes
- Worn or fouled spark plugs (common in vehicles overdue for service)
- Weak ignition coil that breaks down only when cold
- Leaking or slow-opening fuel injector
- Low fuel pressure during cranking (weak fuel pump or check valve)
- Stretched timing chain causing cam/crank correlation drift
- Vacuum leak that disappears after warm-up
How to diagnose P0316
Steps ordered by urgency — tackle Now items first.
- NowScan for any companion P030x cylinder-specific codes — they pinpoint which cylinder is misfiring.
- NowNote vehicle mileage and last spark-plug service. Plugs and coils are the most common root cause.
- SoonInspect spark plugs for fouling, gap drift, or oil contamination. Replace if past service interval.
- SoonPerform a coil-swap test if a specific cylinder is identified — move the suspect coil to a different cylinder and see if the misfire follows.
- LaterCheck fuel pressure during cranking and at idle — low pressure can cause cold-start misfires that disappear when warm.
How to fix P0316
Fixes listed in order of likelihood and cost-efficiency.
- 1Replace worn or fouled spark plugs
- 2Replace failing ignition coil identified by swap test
- 3Repair vacuum leak
- 4Replace leaking fuel injector
- 5Address low fuel pressure (filter, pump, regulator)
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Recommended tools & parts
These recommendations appear because this issue commonly requires inspection in this system area. ratchit does not recommend replacing parts until the likely cause is confirmed.
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Estimated Repair Cost — P0316
Ranges vary by vehicle, region, and shop. Use as a ballpark — always get a quote.
DIY estimate
$15 – $80
Shop estimate
$100 – $350
DIY estimate
$30 – $120
Shop estimate
$150 – $400
DIY estimate
$40 – $180
Shop estimate
$250 – $700
Cost data is estimated and may not reflect your specific vehicle or location.
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Frequently Asked Questions
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