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P0310 means cylinder 10 has a misfire. Cylinder 10 only exists on V10 or V12 engines. The Ford 6.8L V10 Triton (Excursion, F-250, E-350) is by far the most common culprit. Swap plug and coil with cylinder 9 to confirm. See top-rated scanners on Amazon ↑
🗺️ Where Is the Problem?
Blueprint view - P0310 fault localized to cylinder #10 (spark plug, ignition coil, or fuel injector)
These are statistical causes across ALL vehicles - your exact car may rank differently
For example, on a Honda 4-cyl the downstream O2 sensor causes P0310 64% of the time, but on a GM 5.3L V8 the catalytic converter is the cause 71% of the time. Get a probability ranking built specifically for your year, make, model, and mileage.
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🎯 Top Causes & Probability
55%
#1 - Most Likely
Failed Coil-on-Plug (Cylinder 10)
Same story as cylinder 9: COP failures dominate at 80k+ miles, especially on the Ford Triton V10. Heat from the exhaust manifold cracks the boot. On BMW/Mercedes V12 the rear-bank coils run hottest and fail first.
🔩 Part
$30–$120
👨🔧 Labor
$50–$150
⚡ DIY Difficulty
Easy
30%
#2 - Check First
Worn or Fouled Spark Plug (Cylinder 10)
A high-mile, never-changed plug on cylinder 10 can no longer reliably fire. On Ford Triton 2-valve heads, ALWAYS soak the plug well with penetrating oil before removal - these engines snap plugs and require head removal to fix.
🔩 Part
$8–$25
👨🔧 Labor
$30–$120
⚡ DIY Difficulty
Medium
15%
#3 - Less Common
Stuck or Carbon-Fouled Injector (Cylinder 10)
On V10/V12 engines, an injector that's carbon-fouled or stuck partially open delivers wrong fuel volume to cylinder 10. A scope check on the injector control circuit confirms the PCM is firing it correctly.
🔩 Part
$80–$300
👨🔧 Labor
$100–$200
⚡ DIY Difficulty
Hard
🚗 Most Affected Vehicles
🔧 Step-by-Step Diagnosis
- Locate cylinder 10 - Ford 6.8L Triton: 5th cylinder on the passenger bank. BMW/Mercedes V12: bank-specific (consult service manual).
- Swap coil cyl 10 ↔ cyl 9 - clear codes, drive briefly. If P0309 sets, coil is bad. About a $40 part on a Triton.
- Swap plug cyl 10 ↔ cyl 9 - on Tritons, this is a 30+ minute job per plug due to the access. Use a good penetrant first.
- Compression test cylinder 10 - rule out a dropped valve seat or worn rings (a known failure mode on high-mile Triton V10s).
- Inspect the injector connector and harness - the rear-most cylinders sit closest to the firewall and have the longest harness runs.
📍 Find a Trusted Shop Near You
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Tips for Choosing a Shop
- Ask if they charge a diagnostic fee and whether it applies toward the repair
- Request a written estimate before approving any work
- Ask specifically about the part brand - OEM vs. aftermarket matters for this code
- Check Google reviews for recent mentions of the specific repair you need