P0310 – Cylinder 10 Misfire Detected

Last updated: April 4, 2026

DTC P0310 is an ISO/SAE controlled, General powertrain code that indicates the engine control module has detected a misfire event attributed to cylinder 10. A misfire means cylinder 10 is not consistently producing the expected combustion torque, which can show up as rough running, hesitation, vibration, or a lack of power depending on when it occurs. The code identifies the cylinder where the misfire pattern is detected, but it does not identify the failed component. Accurate diagnosis requires confirming the operating conditions stored in freeze-frame data and then testing the ignition, fuel delivery, air intake integrity, electrical circuits, and mechanical condition that allow cylinder 10 to burn the air-fuel mixture correctly.

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P0310 Quick Answer

P0310 – Cylinder 10 Misfire Detected means the engine controller has detected a misfire on cylinder 10. Verify the misfire with scan-tool data, then test cylinder 10 ignition, injector operation, wiring/power/grounds, intake air leaks, and compression before replacing parts.

What Does P0310 Mean?

P0310 – Cylinder 10 Misfire Detected is set when the engine controller determines that cylinder 10 is misfiring. In practical terms, cylinder 10 is not contributing normal power during some combustion events, and the controller has associated that loss with cylinder 10 specifically.

The misfire detection strategy is based on interpreting crankshaft speed fluctuations over time. When combustion is normal, each cylinder’s power stroke produces a predictable acceleration of the crankshaft. When combustion is weak or absent, the crankshaft does not accelerate as expected during that cylinder’s contribution window, and the controller flags a misfire for that cylinder. The code indicates the affected cylinder (10), not the underlying cause.

Theory of Operation

The misfire monitor continuously evaluates crankshaft rotational uniformity. Using the crankshaft position signal (and often camshaft position information to identify firing events), the controller compares expected crankshaft acceleration against actual acceleration. If the deviation exceeds calibrated limits and can be attributed to a specific cylinder event, it increments misfire counts and may set a cylinder-specific code such as P0310.

Any condition that disrupts stable combustion in cylinder 10 can create this signature: insufficient ignition energy, incorrect air-fuel mixture, inadequate fuel delivery, unmetered air entering near that cylinder, electrical supply or control problems to the ignition or injector, or mechanical faults that reduce compression or valve sealing. Because multiple fault types can produce the same misfire pattern, a test-based approach is required.

Symptoms

• Check Engine Light (MIL) illuminated (may flash during higher misfire rates)
• Rough idle or uneven engine rhythm
• Hesitation, stumble, or bucking during acceleration
• Reduced engine power, especially under load
• Increased exhaust odor or fuel smell if misfire is severe
• Engine vibration felt through the vehicle at idle or under load
• Poor fuel economy due to incomplete combustion and compensation strategies

Common Causes

• Worn, fouled, damaged, or incorrectly gapped spark plug on cylinder 10
• Ignition coil/boot issue affecting cylinder 10 spark output
• Cylinder 10 fuel injector fault (restricted flow, sticking, or electrical issue)
• Wiring/connector problems at cylinder 10 coil or injector (opens, shorts, poor pin fit, corrosion)
• Power supply or ground faults impacting ignition/injector operation
• Intake air leak affecting cylinder 10 runner or sealing surface
• Low compression or mechanical fault affecting cylinder 10 (valve sealing, ring seal, head gasket leakage)
• Fuel pressure/volume issues that reduce combustion stability (may present as cylinder-specific misfire depending on distribution and margins)

Diagnosis Steps

Tools you need: Scan tool with live data, freeze-frame access, and misfire counters (Mode $06 where available); digital multimeter for voltage/continuity and voltage-drop tests; spark tester or ignition oscilloscope (if available); noid light or scope for injector command checks; basic hand tools; smoke machine for intake leak testing; fuel pressure test equipment (as applicable); compression gauge and, if needed, leak-down tester.

1. Confirm the code and capture data. Verify P0310 is present (stored, pending, or history) and record freeze-frame information before clearing anything. Note RPM, load, coolant temperature, short- and long-term fuel trims, and vehicle speed to understand when the misfire was detected.
2. Check for additional DTCs. Look for other misfire codes (including random/multiple misfire codes), fuel trim/mixture codes, crank/cam correlation codes, or injector/ignition circuit codes that may change the diagnostic path or point to a shared cause.
3. Verify the misfire is currently occurring. Use live misfire counters (and Mode $06 data where supported) to confirm cylinder 10 is accumulating misfires under similar conditions to the freeze-frame snapshot (idle, steady cruise, or under load).
4. Perform a targeted visual inspection at cylinder 10. Inspect the cylinder 10 ignition components and connectors for oil/water contamination, damaged boots, loose connectors, terminal issues, and harness chafing. Confirm components are fully seated and routed correctly.
5. Check electrical power and ground integrity. With the engine running (or during a load condition when possible), perform voltage-drop tests on the power feed and grounds supplying the ignition coil and injector circuits. Excessive voltage drop can weaken spark energy or injector operation without immediately setting a dedicated circuit code.
6. Evaluate ignition performance for cylinder 10. If accessible, inspect the spark plug condition (fouling, damage, gap) and verify the coil can deliver adequate spark using appropriate test methods. If conditions permit, perform a controlled swap test (coil and/or plug moved to another cylinder) and re-check misfire counts to see whether the misfire follows the swapped component.
7. Evaluate fuel injector command and function. Confirm injector power supply and verify the injector receives a command signal using a noid light or scope. If the control signal is present, compare injector operation to another cylinder and, if available, perform functional testing such as an injector balance test to assess relative flow.
8. Check for unmetered air affecting cylinder 10. Smoke-test the intake system and inspect sealing surfaces near the cylinder 10 runner. A localized intake leak can create a cylinder-specific lean condition that triggers a misfire on that cylinder.
9. Verify mechanical integrity of cylinder 10. Perform a compression test and compare cylinder 10 to the other cylinders. If compression is low or inconsistent, follow with a leak-down test to pinpoint whether the issue is related to valves, rings, or head gasket sealing.
10. Confirm the repair with a verification drive. After repairs, clear codes as appropriate, then drive the vehicle under the conditions that previously triggered the misfire. Re-check misfire counters and ensure the code does not return. Confirm readiness status as required for emissions verification.

Professional tip: Recreate the freeze-frame conditions as closely as practical. A cylinder 10 misfire that appears only under load often points to ignition demand or electrical supply issues that may not show up during a quick idle check, so correlate misfire counters with system voltage and engine load while testing.

Possible Fixes

• Replace the spark plug on cylinder 10 if inspection/testing shows wear, fouling, damage, or incorrect gap
• Replace the ignition coil/boot for cylinder 10 if testing confirms weak or inconsistent spark output
• Repair wiring, connector pin fit, corrosion, or insulation damage affecting the cylinder 10 coil or injector circuits
• Repair power supply or ground faults verified by voltage-drop testing
• Clean, service, or replace the cylinder 10 fuel injector if electrical checks pass but flow/function testing indicates a fault
• Repair intake leaks affecting cylinder 10 runner sealing or nearby vacuum paths confirmed by smoke testing
• Repair mechanical issues causing low compression or leakage in cylinder 10 based on compression/leak-down results
• Correct fuel pressure/volume problems if testing shows inadequate fuel delivery

Can I Still Drive With P0310?

Driving with P0310 is risky because an active misfire can cause poor performance and may increase the chance of damage to the catalytic converter due to unburned fuel entering the exhaust. If the MIL is flashing, the misfire rate is high and you should avoid driving beyond what is necessary for diagnosis or safe relocation. If the engine is shaking heavily, running poorly, or stalling, discontinue driving and have the vehicle transported to prevent further damage.

How Serious Is This Code?

P0310 can range from moderate to severe depending on misfire frequency and operating conditions. A mild intermittent misfire may be limited to occasional roughness, but a consistent misfire can cause significant power loss, drivability concerns, and increased exhaust temperatures. Because misfires can lead to catalytic converter overheating and potential internal damage when severe, the code should be addressed promptly with testing that confirms whether the issue is ignition-related, fuel-related, electrical, air-related, or mechanical.

Common Misdiagnoses

A frequent misdiagnosis is replacing ignition parts based only on the cylinder-specific code without verifying spark quality, injector command/flow, power and ground integrity, or cylinder mechanical condition. Another common error is working on the wrong cylinder due to cylinder numbering confusion, which leads to repeated symptoms and unnecessary parts replacement. Skipping voltage-drop testing and overlooking connector terminal issues can also result in misdiagnosis, since intermittent electrical resistance can mimic a failed coil or injector.

Most Likely Fix

The most likely fix depends on what testing proves is causing cylinder 10 to misfire, but the highest-probability repair path is to confirm the misfire with scan data and then correct a verified cylinder 10 ignition or fuel delivery fault (such as a spark plug/coil issue or an injector/wiring problem). The correct repair is the one supported by component testing, swap testing where appropriate, and verification that misfire counts for cylinder 10 remain controlled under the same conditions that originally set P0310.

Repair Costs

Repair cost depends on whether the confirmed root cause is wiring, connector condition, a sensor, a module, or the labor needed to diagnose the fault correctly.