7 Symptoms of a Bad Ignition Coil and Replacement Cost

6. Engine light Code On / DTC on

Commonly the code is: P0351 (Ignition Coil – Primary/Secondary Circuit Malfunction). If the ignition coil has a malfunction, the engine light code in the combination meter will turn on, and you should use a scanner or diagnostic tool to check the malfunction.

7. Engine hard starting

This symptom will occur especially if your car uses a single coil. If the coil has a malfunction, it means the engine will be cranking without sparks inside all cylinders.

The Average Ignition Coil Replacement Cost

The cost of a new ignition coil depends on the make and model of the car. Some coils are as cheap as $75 while others cost in the $300 range. If you have the replacement professionally done then the labor costs will be between $50 and $100 per hour. Therefore, you can expect to pay at least $150 to $200 if you were to take your car into a professional automotive repair shop and have them replace your ignition coil for you.

Read also: Average Fuel Filter Replacement Costs

Tips to Test Ignition Coil

There are little different tips to test ignition coil based on types. And below are some tips to test your ignition coil CNP, COP and Stick Coil Types:

CNP Coil Type

To run a test on an ignition coil, first turn off your car’s engine and open up the hood. Remove or pull the spark plug wire from it (If you car use CNP coil). These wires typically start from the distributor cap and run to the spark plug. Use rubber gloves and insulated tools when working with these electrical components. Now attach the new spark plug to the spark plug wire (new or old spark plug to test coil sparks). Use insulated pliers to hold the spark plug onto some metal part of the engine so that the threaded portion of the spark plug is touching the metal. Disconnect the fuel pump and get ready to crank that engine. You may need an extra person to turn the key in the ignition because you are holding the spark plug down with the pliers. Once the engine is cranked, look for blue sparks forming along the spark plug gap. If you see blue sparks then your ignition coil is working properly. If you don’t see the sparks or if you see orange sparks then this is a sign of the ignition coil malfunctioning. When you’re done with the test, disconnect the spark plug, place it back in its hole and then reconnect the spark plug wires to it.

COP and Stick Coil Types

  • Start the engine.
  • Keeps the engine running at idle speed.
  • Open the no. 1 ignition coil bolt, and then pull up the coil to see the engine’s condition.

If the engine’s condition becomes changed to rough idling, that means the no.1 ignition coil is good. Then you can continue this step with the next ignition coil until you find the engine condition has no change. When you pull out a faulty ignition coil, the engine condition should not change.

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12 thoughts on “7 Symptoms of a Bad Ignition Coil and Replacement Cost

  1. Car vibration when driving at 60 or above had new tires put on new brack put on had front check out and it’s all good could it be the time it self

    Reply
  2. I have a 2009 Hindi accent 4 cylinder which has just stared vibrating while driving and idling which gets better when excellerating and engine light stays on
    Need some imfo so when I take it in I am better equip to deal with repair man. Thank you deedra

    Reply
  3. I have a 2001 Chevy Lumina, after so many miles it kinda chugs, or kinda makes the car jerk really bad, I thought it was getting hot pretty quick, I changed plugs, changed fuel filter, cleaned out radiator, and everything, it doesn’t make sense why it keeps doing it

    Reply
  4. My BMW E39 520i would rumble everytime I started him up in the morning. I took it to a mechanic and been advised that 6 coils need replaced, (6 of them thats a coincidence isn’t it)…I got quoted $1680 to replace them incl labour and gst (NZ goods n services tax).

    I went online after that chat with the mechanic and looked around for BMW ignition coils, pkt of 6 would cost -wait for it $344…am i getting ripped off? or am i looking at the wrong product?

    I dont have alot of spare cash for repairing this car so im stressing a lot about it, and just want a driveable car.

    Reply
  5. Hi there…My BMW E39 520i would rumble everytime I started him up in the morning. I took it to a mechanic and been advised that 6 coils need replaced, (6 of them thats a coincidence isn’t it)…I got quoted $1680 to replace them incl labour and gst (NZ goods n services tax).

    I went online after that chat with the mechanic and looked around for BMW ignition coils, pkt of 6 would cost -wait for it $344…am i getting ripped off? or am i looking at the wrong product?

    I dont have alot of spare cash for repairing this car so im stressing a lot about it, and just want a driveable car.

    Reply
  6. ALSO NOTE ON THE COST, SOME CARS HAVE MORE THAN ONE COIL, SUCH AS ONE FOR EACH SPARK PLUG, SO FOR INSTANCE ONE COIL CAN RANGE FROM $50-120 AND THEN ADD LABOR COST. TO REPLACE SIX COILS IS JUST UNDER AN HOUR OF LABOR.

    Reply
  7. Also important to note regarding cost, some cars have 6 coils, one for each spark plug, so you are looking at 6 times the cost of the plug plus labor.

    Reply

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