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P0310 Code: Cylinder 10 Misfire Diagnostic Procedure

P0310 code identifies a combustion misfire associated with Cylinder 10 but does not identify the failed component.

The P0310 OBD-II trouble code means the engine control module has detected a combustion misfire associated with Cylinder 10.

Unlike P0300, which indicates random or multiple-cylinder misfires, P0310 identifies one specific cylinder. That provides a targeted starting point, but it does not prove that the Cylinder 10 ignition coil has failed.

A worn spark plug, weak ignition coil, defective fuel injector, damaged electrical circuit, intake leak, low compression, or valvetrain problem can all trigger P0310.

The engine computer knows Cylinder 10 produced less power than expected. It does not know which component should be replaced, despite the unwavering confidence of anyone standing near a parts catalog.

P0310 belongs to the misfire-code family covered in the complete Pro Street P-code OBD-II guide.

P0310 Quick Answer

ItemInformation
Trouble codeP0310
DefinitionCylinder 10 Misfire Detected
SystemIgnition and combustion
SeverityHigh
Safe to drive?Only briefly if the engine runs smoothly and the Check Engine Light is not flashing
Most common causesSpark plug, ignition coil, injector, wiring, intake leak, or low compression
Common applicationsV10, V12 and W12 engines
Related codesP0210, P0360 and P0300
Typical repair rangeApproximately $50 to $10,000+, depending on the vehicle and cause

What Does the P0310 Code Mean?

P0310 breaks down as follows:

The engine control module monitors slight changes in crankshaft speed during each combustion event. A healthy cylinder accelerates the crankshaft when combustion pushes its piston downward.

When Cylinder 10 repeatedly produces less power than expected, the crankshaft briefly slows. The control module recognizes this pattern and stores P0310.

Depending on the frequency and severity of the misfire, the Check Engine Light may remain steadily illuminated or begin flashing.

P0310 identifies the affected cylinder. It does not identify whether the failure involves:

For a broader explanation of combustion failures, visit our engine misfire symptoms, causes and diagnosis guide.

Which Vehicles Can Store P0310?

P0310 only applies to engines with at least 10 cylinders.

Common engine configurations include:

Applications may include some vehicles from:

Although P0310 has the same general meaning across OBD-II vehicles, cylinder location, ignition design, injector control, access procedures, and specifications vary considerably.

The process for reaching Cylinder 10 on a V10 work truck may be completely different from accessing it on a European W12. The code is standardized. The amount of engine disassembly, naturally, is left to the manufacturer’s sense of humor.

Where Is Cylinder 10 Located?

Cylinder 10 location depends on the engine family and manufacturer’s numbering system.

On a V10 or V12 engine, Cylinder 10 may be:

Some manufacturers place odd-numbered cylinders on one bank and even-numbered cylinders on the opposite bank. Others number cylinders sequentially along each bank.

W12 engines use a more complicated cylinder arrangement that must be verified with manufacturer-specific information.

Before removing an ignition coil, spark plug, or injector, identify Cylinder 10 using:

Testing the wrong cylinder wastes diagnostic time and can create an additional fault if an unrelated connector or coil boot is damaged.

Common Conditions Associated With P0310

A Cylinder 10 combustion problem may cause:

A single-cylinder misfire may be less noticeable on a V10 or V12 because the remaining cylinders can partially mask the loss of power.

However, unburned fuel from Cylinder 10 can still damage the catalytic converter and contaminate the engine oil.

How Serious Is P0310?

P0310 should be treated as a high-priority trouble code.

An active misfire can allow unburned fuel to enter the exhaust. That fuel may ignite inside the catalytic converter, causing it to overheat or melt.

Continued driving may contribute to:

Stop Driving Immediately If:

A flashing Check Engine Light generally indicates a catalyst-damaging misfire. Reduce engine load, pull over safely, and shut off the engine.

If the light remains steady and the engine runs reasonably smoothly, driving a short distance for diagnosis may be possible. Avoid heavy throttle, high RPM, towing, and boost.

Most Common Causes of P0310

Cylinder 10 can misfire because of an ignition, fuel, electrical, airflow, compression, or mechanical problem.

Possible causeRelative likelihood
Worn or fouled spark plugVery high
Weak or failed ignition coilVery high
Damaged coil boot or spark plug wireHigh
Clogged or failed fuel injectorHigh
Coil or injector wiring faultMedium
Intake leak near Cylinder 10Medium
Low Cylinder 10 compressionMedium
Oil or coolant in the spark plug wellApplication dependent
Carbon buildup on an intake valveMedium on direct-injected engines
Burned or leaking valveMedium
Worn camshaft lobe or failed lifterApplication dependent
Damaged piston ringLower
Head gasket failureLower
Incorrect valve timingLower
PCM driver failureRare

The engine family, mileage, maintenance history, related codes, and freeze-frame conditions should determine which system is tested first.

How to Diagnose P0310

Step 1: Confirm P0310

Connect an OBD-II scanner and record:

Do not erase P0310 before saving the freeze-frame information.

Record:

The operating conditions can provide valuable clues.

When P0310 occursPossible diagnostic direction
Cold startInjector leak, deposits, coolant intrusion, or weak compression
Warm idleIntake leak, injector imbalance, or mechanical problem
Heavy accelerationWeak coil, worn plug, excessive plug gap, or insufficient fuel
Wet weatherCoil boot, plug wire, connector, or insulation damage
After heat soakIgnition coil, injector, connector, or wiring fault
ConstantlyDead coil, failed injector, circuit problem, or low compression
After recent serviceLoose connector, wrong plug, damaged boot, or installation error

Step 2: Check for Related Trouble Codes

P0310 may appear with other misfire, ignition, fuel, or timing codes.

Related codes include:

Several cylinders misfiring together may indicate a shared problem such as:

Step 3: Verify Cylinder 10 Location

Use vehicle-specific service information to identify Cylinder 10.

Inspect the surrounding area for:

Access can be difficult on V10, V12, and W12 engines. Some applications may require the removal of intake ducts, engine covers, fuel rails, or intake manifold components.

Confirm the required service procedure before beginning major disassembly.

Step 4: Inspect the Cylinder 10 Spark Plug

Remove the Cylinder 10 spark plug and compare it with a plug from a healthy cylinder.

Check for:

A fuel-wet plug may indicate that fuel is entering Cylinder 10 but the mixture is not igniting.

A dry plug may suggest insufficient fuel delivery.

Oil deposits may indicate:

If the spark plugs have exceeded their service interval, replace the complete set using the correct part number and gap.

Step 5: Swap the Cylinder 10 Ignition Coil

If the engine uses accessible coil-on-plug ignition, move the Cylinder 10 coil to another cylinder.

For example, swap the Cylinder 10 and Cylinder 8 coils. Clear the codes and operate the engine under conditions similar to those recorded in the freeze-frame data.

If the code changes from:

P0310 to P0308

the ignition coil is likely defective.

If P0310 returns on Cylinder 10, the coil probably is not the cause.

Inspect the coil and boot for:

Review our bad ignition coil guide for additional ignition-system information.

Also see our ignition coil replacement guide before installing replacement components.

If access requires significant disassembly, verify that moving the coil is practical and permitted by the service procedure.

Step 6: Understand P0310 Versus P0360

P0310 and P0360 describe related but different faults.

CodeMeaning
P0310The PCM detected a combustion misfire associated with Cylinder 10
P0360The PCM detected an electrical malfunction involving Ignition Coil J’s primary or secondary circuit

P0360 provides stronger evidence of an ignition-coil circuit problem.

Possible P0360 causes include:

P0310 without P0360 may still be ignition-related, but fuel delivery, airflow, compression, and valve operation must also be tested.

Coil letters frequently correspond with cylinder numbers, but manufacturer-specific service information should be checked before treating Coil J as Cylinder 10.

Step 7: Test the Cylinder 10 Fuel Injector

A clogged, leaking, stuck, electrically open, or unpowered injector can cause P0310.

Listen to the Cylinder 10 injector with a mechanic’s stethoscope and compare it with the other injectors.

Further testing may include:

Use manufacturer specifications for injector resistance and circuit testing.

Pro Street injector-testing resources include:

Never open a gasoline direct-injection fuel system without following the manufacturer’s pressure-relief procedure.

Step 8: Understand P0310 Versus P0210

P0210 identifies an electrical fault involving the Cylinder 10 injector circuit.

CodeMeaning
P0310Cylinder 10 combustion misfire
P0210Cylinder 10 injector circuit malfunction

If P0310 and P0210 appear together, concentrate on:

P0210 does not automatically prove the injector itself has failed. Damaged wiring or a loose connector can prevent a functional injector from operating.

Step 9: Inspect the Coil and Injector Circuits

If the ignition coil and injector test correctly, inspect their circuits.

Check for:

Use voltage-drop testing while the circuit is operating whenever possible.

A wire can pass a continuity test while failing under load. Electricity enjoys technicalities almost as much as warranty departments.

PCM failure is possible but uncommon. Verify the component, circuit, voltage supply, grounds, and mechanical condition before replacing the module.

Step 10: Check for an Intake Leak

An intake leak near the Cylinder 10 runner can create a localized lean condition.

Inspect:

A smoke test is generally the safest and most effective way to locate an intake-system leak.

Fuel-trim data can provide another clue. Strongly positive fuel trim at idle that improves as engine speed increases frequently indicates a vacuum leak.

Step 11: Perform a Compression Test

If Cylinder 10 has spark, fuel, and correct electrical control, test its compression.

Compare Cylinder 10 with the remaining cylinders and use the manufacturer’s minimum pressure and allowable variation.

Low compression may be caused by:

If Cylinder 10 compression is low, continue with a cylinder leak-down test.

Step 12: Perform a Cylinder Leak-Down Test

Position Cylinder 10 at top dead center on its compression stroke and introduce regulated compressed air.

Air heard or observed atLikely fault
Throttle body or intakeLeaking intake valve
Exhaust outletLeaking exhaust valve
Oil filler openingPiston rings or cylinder damage
Cooling systemHead gasket, cylinder head, or block damage
Adjacent cylinderHead gasket failure between cylinders

Leak-down testing helps determine whether P0310 originates from an internal engine problem.

Step 13: Inspect Cylinder 10 Valve Operation

If compression is low or valvetrain noise is present, inspect valve movement.

Depending on the engine, testing may require:

Reduced valve movement on Cylinder 10 may indicate a failed follower, collapsed lifter, broken valve spring, or worn camshaft lobe.

Step 14: Check for Intake-Valve Deposits

Direct-injected engines can develop deposits on their intake valves because fuel no longer flows across the back of each valve.

Uneven deposits near Cylinder 10 may cause:

A borescope inspection can help confirm deposits. Approved cleaning procedures may include media blasting or professional chemical cleaning.

Step 15: Clear P0310 and Verify the Repair

After repairing the confirmed fault:

  1. Clear stored and pending codes.
  2. Start the engine.
  3. Verify a stable idle.
  4. Monitor Cylinder 10 misfire counters.
  5. Recreate the original freeze-frame conditions when safe.
  6. Complete the required drive cycle.
  7. Scan for pending codes.
  8. Confirm that readiness monitors complete normally.

The repair is confirmed when Cylinder 10 misfire counts remain normal and P0310 does not return.

Common P0310 Repairs and Costs

Repair costs can be higher on V10, V12, and W12 engines because component access may require substantial disassembly.

RepairApproximate installed cost
Replace spark plugs$150–$1,500
Replace one ignition coil$100–$800
Replace plug wire or coil boot$50–$400
Clean or replace one injector$250–$2,000
Repair wiring or connector$150–$1,200
Repair intake or vacuum leak$200–$2,000
Intake-valve carbon cleaning$600–$3,000
Replace intake manifold gasket$800–$4,000
Replace failed lifter or camshaft$2,000–$10,000+
Cylinder-head or valve repair$3,000–$12,000+
Engine replacement$8,000–$40,000+

The failed component may be inexpensive while access requires several hours of labor. That is how a spark plug learns to wear a luxury watch.

Common P0310 Diagnostic Mistakes

Replacing Coil 10 Without Testing It

Swap the coil with another cylinder when practical. If the misfire follows, replace the coil. If P0310 remains, continue testing.

Testing the Wrong Cylinder

Cylinder numbering differs among V10, V12, and W12 engines. Confirm Cylinder 10 before disassembly.

Confusing P0310 With P0360

P0310 identifies a combustion misfire. P0360 identifies an electrical problem involving Ignition Coil J’s circuit.

Ignoring P0210

P0310 combined with P0210 points toward the Cylinder 10 injector or its circuit and should change the diagnostic priority.

Replacing the Injector Without Testing It

Confirm injector power, control, resistance, and fuel delivery before replacement.

Clearing Freeze-Frame Data Too Early

Freeze-frame information may be the best evidence of the conditions that triggered P0310.

Skipping Compression Testing

If the ignition and fuel systems pass, verify the mechanical condition of Cylinder 10.

Replacing the Catalytic Converter First

The converter may have been damaged by P0310. Repair the misfire before evaluating catalyst efficiency.

P0310 Frequently Asked Questions

Does P0310 Mean Ignition Coil 10 Is Bad?

No. A failed coil is common, but P0310 may also result from a spark plug, injector, wiring, intake leak, compression problem, or valvetrain failure.

Can P0360 Cause P0310?

Yes. P0360 identifies an electrical malfunction involving Ignition Coil J, which commonly corresponds with Cylinder 10. Verify the manufacturer’s coil assignment before testing.

Can P0210 Cause P0310?

Yes. A Cylinder 10 injector-circuit failure can prevent the cylinder from receiving the correct amount of fuel.

Can a Spark Plug Cause P0310?

Yes. A worn, cracked, fouled, overheated, or incorrectly gapped Cylinder 10 spark plug can trigger P0310.

Can a Fuel Injector Cause P0310?

Yes. A clogged, leaking, stuck, electrically failed, or unpowered Cylinder 10 injector can create a cylinder-specific misfire.

Can an Intake Leak Affect Only Cylinder 10?

Yes. An intake manifold or injector-seal leak near the Cylinder 10 runner may create a localized lean condition.

Can Low Compression Cause P0310?

Yes. Burned valves, worn rings, piston damage, valvetrain faults, or head gasket failure can reduce Cylinder 10 compression.

Why Does P0310 Only Appear Under Acceleration?

A weak coil, worn plug, excessive plug gap, restricted injector, or fuel-pressure problem may only become noticeable as engine load increases.

Can I Drive With P0310?

Only briefly if the engine runs smoothly and the Check Engine Light remains steady. Stop driving if the light flashes, the engine shakes severely, power drops, or raw fuel can be smelled.

Can P0310 Damage the Catalytic Converter?

Yes. Unburned fuel can overheat and destroy the catalytic converter.

Will P0310 Clear Itself?

The Check Engine Light may turn off after several successful drive cycles, but stored or permanent code data can remain until the required self-tests are completed.

Related Misfire, Injector and Ignition Codes

Explore the Pro Street OBD-II Code Libraries

Use the Pro Street cornerstone pages to find additional diagnostic trouble codes:

P0310 identifies a combustion misfire associated with Cylinder 10. Save the freeze-frame information and verify the correct cylinder before removing components.

Inspect the spark plug, swap-test the ignition coil where practical, and test the injector and related circuits. If the fault remains on Cylinder 10, inspect for intake leaks and verify compression, leak-down results, and valve operation.

The correct repair is the one supported by evidence—not the component with the fastest shipping.

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