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P0352 is a diagnostic trouble code (DTC) for "Ignition Coil B Primary/Secondary Circuit Malfunction". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light is on diagnostic inspection. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
Ignition Coil B Primary/Secondary Circuit Malfunction
The last digit in this particular trouble code indicates that there is an issue detected within the ignition process of cylinder number 2. The coil is essentially a transformer which revamps the lower voltage supplied by the battery into the higher voltage that spark plugs need to ignite the fuel for a successful combustion process. A coil pack will on average will produce about 70,000 to 100,000 Volts.
A coil pack, also known as a coil on plug or an ignition coil, is used to convert the standard battery voltage into the higher voltage needed for the internal combustion process of an engine. The coil pack is characteristically a high voltage generator consisting of two coils, one primary coil and one secondary coil. The large primary coil receives the initial voltage from the battery and transfers it to the smaller secondary coil. The secondary coil is located inside the primary coil, and spins at rapid rates within the primary coil, causing a magnetic field. This, in turn, helps induce the high voltage and amperage needed to ignite the fuel during the combustion process.
A trouble code P0352 may set if the Engine Control Module (ECM) detects an issue with the ignition process of the coil pack. In this case, the coil pack detected as malfunctioning is located above cylinder number 2.
Damaged or corroded wiring of the second cylinder coil pack
Damage or corrosion of the wires connecting the second cylinder coil pack to the Engine Control Module
Open or short in the wiring of the electrical circuit of the second cylinder coil pack
Faulty Engine Control Module
Faulty coil pack
Defective Spark plug(s)
Performs a resistance test on the suspected coil pack
Inspects the condition of the spark plug electrodes
Measures the voltage present at the coil pack
Inspects the wires connecting to the coil packs for fraying, corrosion and at times melting
Inspects the coil pack circuit for a proper ground supply
Inspects the intake manifold for vacuum leaks
Uses a multimeter to measure the Hertz signal sent to a coil pack (helps verify whether the ECM is sending the proper signal to the coil pack)
Some may overlook the fact that a vacuum leak could cause this code as well. Also, some may neglect to measure the hertz signal that should be sent by the ECM to the coil pack. Measuring the Hertz signal will help you determine if the Engine Control Module is faulty, or if there is an interruption in the coil pack circuit, such as corrosion build up or damaged wiring.
It is fairly serious because you can not legally pass inspection with a Check Engine Light on. Driving with a misfire is bad for the engine because if one cylinder is hindered, the other cylinders will have to work twice as hard to run the vehicle. Doing so will stress the other cylinders and cause parts such as piston rings, spark plugs and other coil packs to wear more quickly. This code is known to cause an engine misfire, which will damage or clog the catalytic convertor if not addressed quickly enough.
Replacing the coil pack
Repairing a vacuum leak such as a leaking intake manifold gasket or cracked vacuum line
Repair or replacement of any damaged coil pack wiring
It is strongly suggested to check the Hertz signal from the ECM to the coil pack. Also, it is recommended to check the intake manifold for vacuum leaks.
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