Dtc p0306 bmw

Dtc p0306 bmw DEFAULT

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Last Updated on September 21, 2021

Vehicles are powered by the combustion of air and fuel, which takes place in different engine cylinders. This is how a vehicle generates the power it needs to accelerate and spin its wheels.

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A vehicle usually has 4 to 8 engine cylinders depending on its power needs. When one of these cylinders misfires, the car’s computer sends out a code specifying the faulty cylinder. Although the engine is still able to generate some power after one of its cylinders misfires, it is not enough to sustain the acceleration needs of the driver. 

What Does Code P0306 Mean?

OBD-II Trouble Code P0306 Description

Cylinder 6 Misfire Detected

Code P0306 occurs when the ECM (engine control module) detects a misfire on engine cylinder number 6.

When cylinder number 6 misfires, it means that the air and fuel mixture in that cylinder has failed to ignite. As a result, the engine’s speed fluctuates, causing the crankshaft position sensor signal to vary. The ECM detects this and reports a misfire in the specific cylinder.

See Also: P0300, P0301, P0302, P0303, P0304, P0305, P0307, P0308

Symptoms of Code P0306 

Usually, there will be some noticeable signs that accompany a P0306 error code, and they include:

Causes of Code P0306 

Many things can cause the error code P0306, but these are the most common.

Faulty Spark Plug – The bad spark plug may not properly fire in cylinder 6 due to insulation cracks or fouling.

Faulty Ignition Coil – Cracks in the insulation or open circuit in the ignition coil may cause it to stop firing cylinder number 6.

Worn or Damaged Spark Plug Wire – If a plug boot or spark plug is leaking ignition spark to the ground, cylinder number 6 may stop firing.

Leaky Valve Cover – If the valve cover is leaking oil into the spark plug holes, it may short the spark plug ignition for cylinder number 6. 

Low Compression – Low compression in the cylinder due to defective valves or rings may cause a misfire. 

Clogged, Dirty or Damaged Fuel Injector – Insufficient fuel in the cylinder can cause a misfire. A faulty fuel injector causes low pressure affecting the cylinders. 

Is Code P0306 Serious?

Driving with a misfiring cylinder is dangerous. A misfire in cylinder number 6 causes the engine to run excessively rich, damaging the catalyst. It also affects how your engine runs, makes it hesitate on acceleration, and uses more fuel.

DTC P0306 is not something to be ignored and should be repaired immediately. Ignoring this code can cause damage to your catalytic converter, which is quite costly to replace compared to repairing a misfiring cylinder.

See Also: P0335 Code (Crankshaft Position Sensor Malfunction)

How to Fix Code P0306

To fix this issue, you will need to check all the possible causes listed above. Start with these steps to work on fixing a P0306 error code.

Diagnosis

Start by inspecting the connectors and wiring harness for any damage. Use a good OBD2 scanner to record all error codes and freeze frame data. Use this information to do a quick visual inspection of the fuel injector, ignition coils, and related wiring. 

Look for any loose connections or damaged wiring. Try removing the ignition coil and swap it with another cylinder to check if that is the problem. Clear the engine and ETC codes, then do a road test to confirm if the problem comes back.

Conduct a visual check of the spark plug. Check for any signs of damage or fouling and replace where necessary. Swap the spark plug to another cylinder and see if the misfire follows. If the ignition system is not the problem, check for any vacuum leaks related to the number 6 cylinder.

If nothing is found visually, you may need to pull up the fuel trim parameter identifiers (PID) on a scan tool. You can also use an unlit propane torch or a smoke machine to check for any vacuum leaks. 

If there are no leaks, the next step is to check the fuel injector of cylinder number 6. If no issues are found thus far, there is likely a mechanical problem somewhere.

Conduct a compression and leak-down test to confirm. Look out for any broken valve spring, carboned valve, burnt valve, damaged piston, a worn camshaft lobe, or worn piston rings.

Other Causes of Error Code P0306

Use the results you found in the diagnostic tests to fix the issue. Check whether the cylinder’s spark plugs and ignition coil are working well or not. If they are working well, another problem near these components may be causing the misfires.

Cylinder number 6 may be having compression issues due to faulty rings and valves. Check if oil is leaking from the valve cover and flowing through the holes in the spark plugs. Whatever the problem is, have it repaired immediately. The longer you wait, the more permanent the damage will be.

 
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P0306 – Meaning, Causes, Symptoms, & Fixes

Code P0306 Definition

Cylinder 6 misfire detected.

  • Commonly associated with codes: P0300

What Does P0306 Mean?

P0306 indicates that cylinder number 6 is experiencing misfires. A misfire occurs when an insufficient amount of fuel is burning in a cylinder. The efficient burning of fuel is essential to engine operation as the combustion of fuel is what provides the energy to power the engine. A misfire from one or more cylinders can be caused by many reasons from a faulty ignition system, fuel system, or internal engine failure. When P0306 occurs, it should be fixed immediately as long term driving with engine misfires could cause consequential damage to your engine.  Many times, P0306 occurs when there are worn-out spark plugs, spark plug wires, or a faulty ignition coil.

What Are the Symptoms of Code P0306?

  • Check Engine Light is on
  • Check Engine Light flashing
  • Engine runs rough and shaking
  • Lack of power from the engine
  • Fuel smell from the exhaust
  • Hesitations/Jerking when accelerating

What Is the Cause of Code P0306?

(* = Most Common)

  • Faulty or worn spark plugs *
  • Faulty spark plug wires or coils *
  • Distributor failure *
  • Faulty fuel injector
  • Vacuum leak
  • Low fuel pressure
  • Camshaft sensor defective
  • Crankshaft sensor defective
  • Engine timing off
  • Leaking head gasket
  • Low engine compression
  • Poor quality fuel

How Serious Is Code P0306? – Severe

P0306 should be repaired immediately. Ignoring this error could result in ignition failure, catalytic converter damage, and unsafe/dangerous conditions while operating the vehicle.

Code P0306 Common Diagnosis Mistakes

Loose-fitting electrical connectors and broken or disconnected vacuum hoses are often overlooked.

Tools Needed to Diagnose:

How To Diagnose P0306

Difficulty of Diagnosis and Repair – 2 out of 5

  1. Use FIXD to scan your vehicle to verify P0306 is the only code present. If other codes are present, they must be addressed first.
  2. Check for loose connectors at the ignition coils or for damaged wiring (specifically cylinder 6). Look for loose engine ground wires as well. These can cause random misfire conditions. Tighten or connect where necessary.
  3. Check the condition of your spark plugs and spark plug wires. If your vehicle is equipped with individual coil packs instead of spark plug wires, start by removing the cylinder 6 coil and swapping it with the cylinder number 4 coil. If the misfire moved to cylinder number 4 (P0304), then you have determined that the coil pack is faulty and needs replacement. You can do the same test with the spark plug, i.e., move cylinder 6 plug to say cylinder 3 and if the misfire is now P0303 then the plugs are at fault. Replace spark plugs and spark plug wires/ignition coil packs if needed and recheck for misfires. (How to identify a fouled spark plug, How to test spark plug wires, How to gap spark plugs, How to replace spark plugs, How to swap ignition coils)
  4. If you have determined that your ignition system is operating correctly, there may be a problem within your fuel system that is causing the random misfires. The following should be checked to ensure the engine is getting the proper amount of fuel: Check fuel pressure. Low fuel pressure can cause intermittent misfires on multiple cylinders. When the pressure is below the specification, the engine does not receive the proper amount of fuel and will start to lean misfire. The fuel pump or fuel pressure regulator could be the source of the low fuel pressure. (How to check fuel pressure). Check that the fuel injectors are functioning properly and activating. Random misfires can be a sign of faulty or clogged fuel injectors that need to be replaced. Also, check that the fuel injector wiring is not damaged and is connected properly. (How to check fuel injectors by ear, How to check fuel injectors with a digital multimeter).
  5. If the ignition system and fuel system checks out, you may want to perform an engine compression test and leak down test to see if there are any mechanical problems causing your misfire. Some common mechanical problems that cause misfire can be:
    1. Leaking head gasket
    2. Broken valve spring
    3. Broken piston ring
    4. Worn valve guides
    5. Burned valve
    6. Timing chain or belt skipped tooth and engine is off time.

Estimated Cost of Repair

For error code P0306, one or more of the below repairs may be needed to solve the underlying issue. For each possible repair, the estimated cost of repair includes the cost of the relevant parts and the cost of labor required to make the repair. 

  • Spark plugs $40-$640 (some cars require Intake manifold removal)
  • Ignition Coils $230-$640 (some cars require Intake manifold removal)
  • Spark plug wires $180-$240
  • Fuel injectors $1500-$1900
  • Vacuum leak $100-$200
  • Fuel pump $1300-$1700
  • Fuel pressure regulator $200-$400
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P0306 OBD-II Trouble Code: Cylinder 6 Misfire Detected

P0306 code definition

Cylinder 6 Misfire Detected

What the P0306 code means

P0306 is an OBD-II generic code that the engine control module (ECM) detected a misfire on cylinder number 6 of the engine.

What causes the P0306 code?

  • The spark plug is not firing for cylinder number 6 due to fouling or cracks in the insulation.

  • The ignition coil for cylinder number 6 has stopped firing due to cracked insulation or open circuit.

  • The spark plug wire or plug boot is leaking ignition spark to ground for cylinder number 6 from age.

  • The valve cover is leaking oil into the spark plug holes and shorting the spark plug ignition for the number 6 cylinder.

  • The cylinder has problems with compression being low from defective rings or valves.

What are the symptoms of the P0306 code?

  • The Check Engine Light will be illuminated and the code is set in ECM memory.
  • The Check Engine Light will flash during a misfire event.
  • The engine will have a misfire and may buck or jerk on acceleration.
  • The engine will lack power during acceleration while the misfire is active and may affect transmission shifting.

How does a mechanic diagnose the P0306 code?

  • Scans codes and documents the freeze frame data in order to verify the problem.
  • Clears the engine and ETC codes and road test to verify concern comes back.
  • Removes cylinder 6 ignition coil or plug wire and checks for evidence of spark tracking on outside of coil or plug boot. Also look for oil contamination from a leaking valve cover.
  • Removes the cylinder number 6 spark plug for inspection and makes replacement if necessary.
  • Check engine cylinders compression if no ignition problems are found.

Common mistakes when diagnosing the P0306 code

  • Not switching the coil to a different cylinder to see if the misfire moves to another cylinder. This would indicate a bad coil.

  • Not switching one part at a time with a different cylinder to isolate the failed part.

How serious is the P0306 code?

  • A misfiring cylinder can cause the engine to run excessively rich and can damage the catalyst.
  • The misfire will cause the engine to run rough and hesitate on acceleration.
  • The engine will use more fuel due to the misfire.

What repairs can fix the P0306 code?

  • Replace the faulty spark plug or replace all spark plugs as a set if failure was due to a worn out plug.

  • Replace the leaking valve cover gasket then replace the failed coil, plug wires, and plugs.

  • Replace the ECM for a bad circuit that powers the fuel injector or coil for number 6.

Additional comments for consideration regarding the P0306 code

Code P0306 is triggered when the crankshaft sensor does not get an acceleration of the crankshaft from cylinder number 6 firing properly indicating the cylinder is not contributing to the engine power.

Need help with a P0306 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230 to have this issue resolved.

This article originally appeared on YourMechanic.com as P0306 OBD-II Trouble Code: Cylinder 6 Misfire Detected.


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How to Fix Error Code P0306

P0306 BMW Code - Misfire Cylinder 6

Engine-Codes - Bmw - P0306 BMW

Repair Importance Level: 3/3

Repair Difficulty Level: 3/3  What is this?

What does this mean?

|P0306 BMW code possible causes

  • Faulty spark plug 6
  • Clogged or faulty fuel injector 6
  • Faulty ignition coil 6
  • Fuel injector 6 harness is open or shorted
  • Fuel injector 6 circuit poor electrical connection
  • Ignition coil 6 harness is open or shorted
  • Ignition coil 6 circuit poor electrical connection
  • Insufficient cylinder 6 compression
  • Incorrect fuel pressure
  • Intake air leak

|How is the P0306 BMW code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What does this mean?

|P0306 BMW code tech notes

The P0306 code means that the cylinder 6 is misfiring or is randomly misfiring. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 6. If the problem persists more tests needs to be done to diagnose problem, see "Possible Causes"

|What is the cost to diagnose the P0306 BMW code

Labor: 1.0

The cost to diagnose the P0306 BMW code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P0306 BMW code detected?

Engine Cylinder 6 is Misfiring.

|What are P0306 BMW code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Lack/loss of power
  • Hard start
  • Engine hesitation

|What is P0306 BMW code meaning?

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.

|Need more information with the P0306 BMW code?

Need more information on how to fix the P0306 BMW code?
Get Access to Factory Service Manuals

Repair Importance Level:3

 

1=Low 2=Medium 3=High What is this?

Repair Difficulty Level:3

 

1=Easy 2=Moderate 3=Hard What is this?

Browse Codes for Specific Model-Year

Sours: https://www.engine-codes.com/p0306_bmw.html

P0306 bmw dtc

P0306 BMW Code - Misfire Cylinder 6

AutoCodes - Bmw - P0306 BMW

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What does this mean?

|P0306 BMW code possible causes

  • Faulty spark plug 6
  • Clogged or faulty fuel injector 6
  • Faulty ignition coil 6
  • Fuel injector 6 harness is open or shorted
  • Fuel injector 6 circuit poor electrical connection
  • Ignition coil 6 harness is open or shorted
  • Ignition coil 6 circuit poor electrical connection
  • Insufficient cylinder 6 compression
  • Incorrect fuel pressure
  • Intake air leak

|How do I fix the P0306 BMW code?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What does this mean?

|P0306 BMW code tech notes

The P0306 code means that the cylinder 6 is misfiring or is randomly misfiring. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 6. If the problem persists more tests needs to be done to diagnose problem, see "Possible Causes"

|Cost of diagnosing the P0306 BMW code

Labor: 1.0

The cost of diagnosing the P0306 BMW code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P0306 BMW code detected?

Engine Cylinder 6 is Misfiring.

|What are P0306 BMW code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Lack/loss of power
  • Hard start
  • Engine hesitation

|P0306 BMW code description

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.
OBDII Code P0306 Bmw - Misfire Cylinder 6  - AutoCodes.com

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Need more information on how to fix the P0306 BMW code?
Get Access to Factory Service Manuals

|P0306 BMW code comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the P0306 Bmw code? Have you replaced any parts?
Any information is appreciated. Thanks

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Repair Importance Level:3

 

1=Low 2=Medium 3=High What is this?

Repair Difficulty Level:3

 

1=Easy 2=Moderate 3=Hard What is this?

Browse Codes for Specific Model-Year

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P0306 Explained - Cylinder 6 Misfire (Simple Fix)
Second Lieutenant
rcouchh's Avatar

Drives: 2019 M2 Comp

Join Date: Oct 2020

Location: NJ/NYC

Update on my misfire code as I've heard back from BMW. Car has now been with the service dept for 7 days and still no ETA of when I'll get it back. Getting pissed...

Misfiring on cylinders 1,3, 6. BMW of NA got involved, and advised them on steps to take. They had them check all engine grounds, get engine to temp and watch engine values, removed spark plugs and looked into cylinders with borescope. Found a vacuum leak, so swapped intake tube. Swapped all plugs/coils, and now are supposed to replace the fuel injectors next.

BMW of NA sent an engineer down, he said he ran tests and will be in contact with the dealership on Monday on what to do next. My service advisor said he has no clue why BMW of NA is so involved with this specific instance, and that he in the dark as to what they're doing. Starting to worry me a bit, especially because this issue was prevalent when I first bought the car 2 months ago (it was a used 2019). I'm sure the other dealership I bought it from knew about it, as well as the previous owner.

In 2 months of ownership, my car has now spent roughly 3 weeks in a service dept total. Pretty sure that classifies as a lemon.

Sours: https://f87.bimmerpost.com/forums/showthread.php?t=1764056

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