P0310 Code: Causes, Symptoms, Diagnosis & How to Fix It
The P0310 code means Cylinder 10 Misfire Detected.
This generic OBD2 trouble code is stored when the engine computer detects that cylinder 10 is not firing properly. The code identifies the affected cylinder, but it does not identify which component caused the misfire.
Possible causes include ignition problems, fuel-delivery issues, intake leaks, low compression, wiring faults, or engine timing problems. The exact diagnostic procedure can vary by vehicle.
Cylinder numbering depends on the engine design, so use the manufacturer's service information to locate cylinder 10 before testing components.
P0310 Code Symptoms
Common symptoms may include:
Check Engine Light
Rough or shaking engine
Rough idle
Engine stumbling
Hesitation during acceleration
Reduced engine power
Poor fuel economy
Hard starting
Engine stalling
Unusual exhaust odor
Flashing Check Engine Light
The severity of the symptoms depends on how frequently and severely cylinder 10 is misfiring.
Common Causes of P0310
1. Faulty Spark Plug
A worn, fouled, damaged, or incorrectly gapped spark plug can prevent cylinder 10 from producing consistent combustion.
2. Bad Ignition Coil
A weak or failed ignition coil can prevent cylinder 10 from receiving a reliable spark. If the vehicle uses individual coils, a coil-swap test can help determine whether the misfire follows the coil.
3. Faulty Fuel Injector
A clogged, restricted, leaking, or electrically defective injector can cause incorrect fuel delivery to cylinder 10.
4. Vacuum or Intake Leak
Unmetered air entering the intake system can create an incorrect air-fuel mixture and contribute to a cylinder-specific misfire.
5. Low Fuel Pressure
A weak fuel pump or another fuel-delivery problem can reduce fuel supply and cause misfires, particularly under load.
6. Low Engine Compression
A burned valve, damaged piston, worn piston rings, or head-gasket problem can reduce compression and cause a persistent misfire.
7. Wiring or Connector Problems
Damaged wiring, loose connectors, corrosion, or poor electrical connections can interfere with the ignition coil or fuel injector.
8. Engine Timing Problems
Incorrect valve or ignition timing can interfere with combustion and contribute to a cylinder 10 misfire.
How to Diagnose P0310
1. Scan for Additional Codes
Connect an OBD2 scanner and check for stored and pending trouble codes.
Record freeze-frame information before clearing the codes. Additional ignition, fuel-system, lean-condition, sensor, or misfire codes can provide useful clues.
2. Inspect the Spark Plug
Remove the cylinder 10 spark plug and check for:
Carbon buildup
Oil or fuel fouling
Worn electrodes
Incorrect gap
Cracks or physical damage
The plug's condition can provide clues about the combustion problem.
3. Test the Ignition Coil
Inspect the cylinder 10 ignition coil, boot, connector, and wiring.
If the vehicle allows coil swapping, move the suspected coil to another cylinder. If the misfire follows the coil, the coil becomes a strong suspect.
4. Check the Fuel Injector
Inspect the cylinder 10 injector and electrical connector.
Depending on the vehicle, testing may include injector resistance, electrical operation, fuel delivery, or injector-balance testing.
5. Check for Intake or Vacuum Leaks
Inspect vacuum hoses, intake components, and manifold areas around the affected cylinder.
A smoke test can help locate leaks that are difficult to find through visual inspection.
6. Perform a Compression Test
If the ignition and fuel systems appear normal, test engine compression.
Low compression can point to an internal mechanical problem involving a valve, piston, piston rings, or head gasket.
7. Check Timing and Engine Data
If the basic ignition, fuel, intake, and compression checks do not identify the problem, inspect camshaft/crankshaft synchronization and relevant engine-management data according to the manufacturer's diagnostic procedure.
How to Fix P0310
The correct repair depends on the confirmed cause. Possible repairs include:
Replace the faulty spark plug
Replace a defective ignition coil
Repair ignition wiring or connectors
Replace or repair the fuel injector
Repair an intake or vacuum leak
Correct low fuel pressure
Repair engine timing problems
Repair an internal engine problem
Replace a failed sensor when testing confirms it
After the repair, clear the trouble code and perform a test drive while monitoring misfire data.
Do not automatically replace the ignition coil because P0310 is present. The code identifies the misfiring cylinder, not necessarily the failed component.
Is P0310 Serious?
P0310 should be diagnosed promptly. A persistent misfire can reduce engine performance and fuel economy and may contribute to catalytic-converter damage.
If the Check Engine Light is flashing, the engine is shaking severely, the vehicle has major power loss, or it is stalling, avoid unnecessary driving and have the vehicle inspected promptly.
If the Check Engine Light is steady and symptoms are mild, arrange diagnosis as soon as practical.
P0310 vs. P0309
Code | Meaning |
P0309 | Cylinder 9 Misfire Detected |
P0310 | Cylinder 10 Misfire Detected |
Both codes identify a specific misfiring cylinder. The difference is the cylinder number reported by the engine computer.
P0310 vs. P0300
P0300 indicates a random or multiple-cylinder misfire without identifying one specific cylinder.
P0310 specifically identifies cylinder 10 as the affected cylinder.
Frequently Asked Questions
Can a bad spark plug cause P0310?
Yes. A worn, fouled, damaged, or incorrectly gapped spark plug can cause cylinder 10 to misfire.
Can a bad ignition coil cause P0310?
Yes. A defective ignition coil can prevent cylinder 10 from receiving a reliable spark.
Can I drive with P0310?
Avoid continued driving if the Check Engine Light is flashing, the engine is shaking severely, or there is major power loss or stalling.
Does P0310 mean cylinder 10 is damaged?
No. P0310 identifies a misfire in cylinder 10. The underlying problem could involve ignition, fuel delivery, air intake, compression, wiring, or timing.
Can low compression cause P0310?
Yes. Low compression caused by an internal engine problem can produce a persistent cylinder 10 misfire.
