2015 vw jetta cranks but wont start


  • Volkswagen Jetta Won’t Start Diagnosis
  • Warning Signs Your Volkswagen Jetta Has Engine Trouble
  • 7 Reasons Why A Car Engine Cranks But Won’t Start (Plus How To Diagnose and Fix With Costs)
  • Volkswagen Jetta Won’t Start: How to Resolve the Problem?
  • 25 Most Common Reasons for a Check Engine Light
  • This Is Why Your Car Is Clicking and Won’t Start
  • Volkswagen Jetta Won’t Start Diagnosis

    In case your car ever suffers from engine trouble, here are the top warning signs to know. Schedule Volkswagen Service Today! Warning Lights. As you know, your car comes with warning lights. Warning lights are actually there to make you aware of potential problems your car is experiencing. When you first turn your car on, all of your warning lights will flash to life as your car performs all of its inspections to ensure everything is working correctly.

    If everything is good, they will turn off as they are supposed to. If any of your warning lights turn on and stay on, though, this is a clear sign that something may not be working as it should be. Say your check engine light comes on. This is definitely one of the scariest warning lights because it could mean a number of things, from not-so-serious reasons like your gas cap not being screwed on well enough to a serious problem like an overheating engine. To accurately diagnose the cause of your engine warning light, you should take your car to a professional technician.

    Jerking Motions. When you drive your car, it should provide an easy and smooth performance. But if your car starts doing jerking motions like a break dancer pop-and-locking, this could be a sign of engine trouble. The cause? Bad Noises. If your car makes any of these noises, it is definitely not normal, and could be a sign of trouble lurking ahead.

    This situation occurs when gasoline ignites prematurely in the combustion chamber of the engine cylinders. If this occurs, piston damage can result — a very costly repair. If your car makes grinding noises, there are two main causes: If you hear a grinding noise when you start your car, your starter motor may need to be adjusted or replaced. If you hear a grinding noise when shifting gears, you may need a transmission replacement. Foul Odors. Some reasons for a smelly car include an oil or coolant leak, or a toxic gas leak, like carbon monoxide.

    The last is very dangerous, even fatal! If the interior of your car smells like you are standing outside behind it, get out of your car immediately and get it fixed. For all your automotive needs, we can help! Contact Service Please don't hesitate to direct your service questions to us! Fill out the simple form below and our technicians will get back to you.

    Warning Signs Your Volkswagen Jetta Has Engine Trouble

    The engine is turning but it will not start to run by itself after the starter motor has stopped turning the flywheel. Most engines will splutter to life even if the spark plugs are failing or if the compression has dropped inside of the engine. A constant supply of fuel at the right pressure is necessary to keep your engine running.

    The fuel supply system is fairly complicated, with lots of parts, any one of which could be the problem. If the problem is with the fuel system, then you will almost definitely have an error code stored in the ECU. Some typical injectors in an engine This code can be triggered if there is a restriction in the fuel lines, a blocked fuel filter , a weak or faulty fuel pump or dirty fuel. If the fuel pump is to blame then an addition code such as P or P will be logged.

    A restriction or blockage in the fuel lines or fuel filter will usually require a manual inspection. If you know the vehicle service history this can help to diagnose if it is the fuel filter not. Faulty or blocked fuel injectors can also be the reason why your engine is starved of fuel. Fuel injectors can become blocked and can fail mechanically or electrically.

    Common fuel injector error codes include P, P and P Sometimes the engine will start but will idle really badly and may cut out. Simply checking if a spark plug is generating a spark is not enough when it comes to modern fuel injected engines.

    The spark quality and timing has to be extremely clean and precise for the engine to start and run properly. If I suspect a problem with the spark plugs I always start with a diagnostic. A bad spark plug will often throw up a misfire error code. Common codes include P and P to p If you see one of these codes, then you can go ahead and remove each of the spark plugs one by one to see if they are causing the problem.

    A bad spark plug can sometimes be identified by having excessive carbon deposits on its tip, burnt or corroded surface, it may smell of fuel or be covered in fuel or it may be covered in oil. This is usually a more common problem with engines that are fitted with a timing belt as opposed to a timing chain. If the belt has slipped or jumped a tooth, this will cause a problem with the timing of the valves and pistons. Sometimes this will usually result in a drop in compression pressure in the cylinder and this can stop the engine from turning over.

    If the belt has broken completely, then the engine will definitely not start. Depending on the position of the crankshaft and camshaft, you may be left with internal engine damage. If you have followed the manufacturers guidelines and the timing belt has been changed then it is unlikely that the problem lies with the timing belt.

    If you can hear a loud rattle or tapping noise when the engine is trying to turn over, then it may indicate a slipped timing belt that is loose and hitting against the plastic covers. If your car is fitted with a timing chain, then a broken timing chain tensioner or guide could cause it to jump a tooth and knock out the engine timing. Battery Issues Usually a bad battery is associated with a car that will not start after not being used for a while.

    However, sometimes a battery that is failing or has a few failed cells will still manage to crank the engine but will fail to deliver the required power to the fuel pump and ECU to get the car going. There is usually a gap of a few seconds after the engine has started, before the alternator takes over delivery of most of the power to the vehicle.

    If this is the case, then you will usually only be able to crank the engine a few times before the battery will die completely. Modern cars will usually do a full system check in the background once you insert the key or unlock the doors. This includes a check of the electrical systems and battery voltage and condition. Oil pressure problems If your car cranks but wont start even with starting fluid then the problem could be caused by lack of oil pressure.

    If the oil pressure is too low, or does not build up quickly enough, this can cause an engine to cut out a few seconds after it starts. If a low oil pressure error code such as P is logged, this can indicate a problem with the oil pressure in the engine. There are many reasons why the oil pressure is too low. Most engines will burn a small amount of oil and will need topping up occasionally.

    Remember to refit the oil fill cap tightly after topping and push down the dip stick fully after checking the oil level as both of these can trigger an oil pressure error code. A loose timing belt will cause a drop in compression in the engine and this will cause a drop in engine oil pressure. There may also be a problem with the engine oil pressure sensor or circuitry and this could be relaying an out of range value to the ECU.

    It is often situated low down in at the back of the engine between the oil pan and oil filter, but this can vary depending on the vehicle. Air flow problems To run, your engine needs the right amount of air and the right amount of fuel.

    Take out the air filter and check that the air filter box and pipes leading back to the intake manifold are not blocked with leaves or other debris. Try starting the engine with the air filter out to see if this rectifies the problem. A faulty MAF sensor will not supply the ECU with correct air flow readings, playing havoc with the air to fuel ratio Sometimes the problem may be caused by a faulty or dirty mass air flow sensor. This sensor is responsible for keeping track of the amount of air getting into the intake manifold.

    If it is faulty then the ECU will find it more difficult to adjust the fuel supply to match the current engine conditions. A bad mass airflow sensor will sometimes throw up error codes P, P ,P,P An easy way to test the mass air flow sensor is to unplug its electrical connector.

    This will cause the ECU to default to a less economical default reading that is stored in its memory. If the car now starts but is running a bit rough then the mass air flow sensor is probably dirty or faulty. All modern engines are packed full of engine management sensors that relay information back to the ECU in real time. This can be a good thing and a bad thing. On the one hand, it can make it a lot easier to diagnose a problem if you have a diagnostic reader and know what you are looking for.

    On the other hand, a faulty sensor can create false readings and can leave you stranded on the side of the road. The most common sensors that will stop your car from starting include the camshaft sensor, the crankshaft sensor, the mass air flow MAF sensor, the manifold absolute pressure MAP sensor and the throttle position sensor.

    The camshaft position sensor is responsible for sending the ECU a signal each time that cylinder number one intake valve opens.

    A bad camshaft sensor will not be able to accurately detect the position of the camshaft, and this can cause a misfire if the engine starts or it may prevent the engine from starting to begin with. Error codes p and P are commonly triggered when there are problems with the camshaft and crankshaft sensors.

    As discussed earlier. The mass air flow sensor is responsible for monitoring the air entering the intake manifold. The manifold absolute pressure MAP sensor also monitors the air in the intake manifold by measuring the air pressure in realtime. If one or both of these readings is out of range then the engine will run rich. This will usually cause the engine to stall or misfire.

    It can also cause the engine to flood when it is trying to start. Run a diagnostic check using a code reader This will tell you if there are any faulty engine sensors causing the engine to cut out. Faulty engine sensors such as the camshaft, crankshaft, manifold absolute pressure and fuel pressure sensors can cause an engine to stall right after starting. To begin with, I always start by hooking up a diagnostic reader to see if there are any error codes stored in the ECU.

    If the check engine light has come on, then this usually means that an error code has been stored. This can really help get to the source of the problem quickly, and often without getting your hands dirty!

    Battery Charge If your battery no longer has enough charge to turn the starter, your Jetta will not start. You can take your battery up to the local parts store, or even Wal-Mart, and have it tested to see if it is still holding a charge.

    7 Reasons Why A Car Engine Cranks But Won’t Start (Plus How To Diagnose and Fix With Costs)

    Battery is Charged— If the battery is charged, then it would still be advisable to take a look at the battery cables and see if there is an issue with corrosion. Otherwise, it may be the starter that you need to look at. A bad alternator can cause your battery to lose enough charge to start your Jetta. When a starter goes bad, they will usually not give you much warning first. Also, if you are stuck somewhere and are trying to start your Jetta, the old beat the starter with a hammer trick is not a wives tale.

    It really can get that one last start out of it. The engine needs air, fuel, and a spark in order to run. It is highly likely that if the engine is cranking, but not starting that it has thrown an OBDII code. It is definitely worth it to use an OBDII scanner to check and see if the engine has thrown any trouble codes.

    Volkswagen Jetta Won’t Start: How to Resolve the Problem?

    Some typical injectors in an engine This code can be triggered if there is a restriction in the fuel lines, a blocked fuel filtera weak or faulty fuel pump or dirty fuel.

    If the fuel pump is to blame then an addition code such as P or P will be logged. A restriction or blockage in the fuel lines or fuel filter will usually require a manual inspection. If you know the vehicle service history this can help to diagnose if it is the fuel filter not.

    Faulty or blocked fuel injectors can also be the reason why your engine is starved of fuel. Fuel injectors can become blocked and can fail mechanically or electrically. Common fuel injector error codes include P, P and P Sometimes the engine will start but will idle really badly and may cut out.

    Simply checking if a spark plug is generating a spark is not enough when it comes to modern fuel injected engines. The spark quality and timing has to be extremely clean and precise for the engine to start and run properly. If I suspect a problem with the spark plugs I always start with a diagnostic. A bad spark plug will often throw up a misfire error code. Common codes include P and P to p If you see one of these codes, then you can go ahead and remove each of the spark plugs one by one to see if they are causing the problem.

    25 Most Common Reasons for a Check Engine Light

    A bad spark plug can sometimes be identified by having excessive carbon deposits on its tip, burnt or corroded surface, it may smell of fuel or be covered in fuel or it may be covered in oil. This is usually a more common problem with engines that are fitted with a timing belt as opposed to a timing chain. If the belt has slipped or jumped a tooth, this will cause a problem with the timing of the valves and pistons. Sometimes this will usually result in a drop in compression pressure in the cylinder and this can stop the engine from turning over.

    This Is Why Your Car Is Clicking and Won’t Start

    If the belt has broken completely, then the engine will definitely not start. Depending on the position of the crankshaft and camshaft, you may be left with internal engine damage. If you have followed the manufacturers guidelines and the timing belt has been changed then it is unlikely that the problem lies with the timing belt. If you can hear a loud rattle or tapping noise when the engine is trying to turn over, then it may indicate a slipped timing belt that is loose and hitting against the plastic covers.

    If your car is fitted with a timing chain, then a broken timing chain tensioner or guide could cause it to jump a tooth and knock out the engine timing. Battery Issues Usually a bad battery is associated with a car that will not start after not being used for a while. When you drive your car, it should provide an easy and smooth performance. But if your car starts doing jerking motions like a break dancer pop-and-locking, this could be a sign of engine trouble.

    The cause? Bad Noises. If your car makes any of these noises, it is definitely not normal, and could be a sign of trouble lurking ahead.

    This situation occurs when gasoline ignites prematurely in the combustion chamber of the engine cylinders. If this occurs, piston damage can result — a very costly repair. If your car makes grinding noises, there are two main causes: If you hear a grinding noise when you start your car, your starter motor may need to be adjusted or replaced.

    If you hear a grinding noise when shifting gears, you may need a transmission replacement.


    2015 vw jetta cranks but wont start