How To Fix P0352 OBD2 Code

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How serious is this repair?
Table of Contents

A P0352 issue code means “ignition Coil B Primary/Secondary Circuit Malfunction.”

P0352 code meaning

The final number of this fault code denotes that a problem with cylinder number 2’s igniting mechanism has been discovered. The circuit effectively transforms the current battery’s lower power into the ignition system’s constant potential for fuel combustion.

This is the procedure that leads to effective ignition. The voltage produced by a coil pack is usually around 70,000 and 100,000 volts.

A circuit pack, also referred to as a coil on plugging or an igniting coil, transforms ordinary battery electricity to the constant potential necessary by the spark ignition mechanism of an engine.

P0352 Code Meaning:

A coil packing is a high-voltage producer of two main circuits and one supplementary. The huge primary coil receives the current battery’s actual voltage and transfers it to the smaller coil. The secondary coil rotates at high speed within the primary coil, producing magnetism. As a result, the high voltage and current needed for the ignition system during the complete combustion can be generated.

The fault number P0352 may be created if the engine control module (ECM) identifies an issue with the coil pack’s combustion of fuel. In this particular problem diagnosis, the discovered defective coil pack is positioned over cylinder number 2.

OBD-II Code P0352: Symptoms, Causes & Diagnose


  • There may be many signs that come along with this error number. Do you want to know some of the most prevalent symptoms of OBD Error Code P0352?   Take a look at the following:
  • Common Signs and Symptoms
  • Your car’s engine may rest unevenly.
  • Speed may cause the engine to misfire.
  • The fault warning lamp may begin to illuminate.
  • The engine may fail, particularly when under severe load.
  • The problem of engine stuttering
  • The engine may be hard to handle.
  • Instabilities out of the ordinary can be experienced at rest or while moving.


  • Corrosion or breakage to the second cylinder coils pack connections
  • Rusted or defective wires linking the powertrain control circuit to the secondary cylinder coil pack
  • Engine Management Unit Trouble
  • Faulty coil pack 
  • Open or short in the connection of the electrical circuit of the second cylinder coil pack
  • Faulty spark plugs 

How to diagnose P0352 obd2 code

Tools you need to process

  • You may already have the following tools:
  • Screwdrivers
  • The multimeter (digital)
  • 5/8in. Spark Plug Socket
  • Ratchets, extensions, and sockets
  • Gasoline pressure gauge
  • Compression tester
  • Leak detector
  • The ignition system’s plugs
  • Spark plug wires


The suspicious coil pack is subjected to a test performed. 

  • Analyze the spark plug wires for any damage. 
  • The power generated at the circuit pack is measured. 
  • Analyzes the cables that link the coil packs for bending, rust, and, on rare occasions, melting. 
  • Checks for an appropriate base supply in the coil pack circuits. Look for air leakage in the inlet manifold. 
  • It assists in assuring if the ECM sends the a to the coil prate signal to the unit.

It can be difficult to correctly diagnose OBD-II codes such as DTC P0352 because the error code can appear for various reasons. Fortunately, there are numerous online resources available to assist you in determining the root cause of this specific code. 

A common mistake you must avoid when the diagnosis.

Some people may overlook that a vacuum leak could also cause this code. Furthermore, some people may fail to measure the hertz signal that the ECM should send to the coil pack. Measuring the Hertz signal will assist you in determining whether the Engine Control Module is faulty or if there is an interruption in the coil pack circuit, such as corrosion or damaged wiring.

Start by looking at the more typical diagnostic blunders when dealing with the P0352 error code:

  • When a vacuum leakage is a reason for the problem, most people remove the ignition coil.
  • Many individuals mistakenly believe that the problem is with the fuel injectors when, in fact, the problem is with vacuum leaks.

How to fix P0352 ObdII code

Diagnosis and troubleshooting of the P0352 code necessitate automotive knowledge. If you are unsure about your knowledge or DIY abilities, it is best to leave the job to your mechanic. Otherwise, you are free to try to solve the problem independently.

Diagnosis is the first step in P0352 code repair. Once you’ve determined what caused the DTC, use online auto repair resources and guides to resolve it.

The P0352 code is a generic powertrain code, which means a wide range of vehicle supports, makes, and models and the repair procedure may differ from one vehicle to the next. Before attempting repairs, consult a repair manual or database to ensure you’re using the correct fix for your vehicle. Otherwise, you risk exacerbating the problem.

How serious is this repair?

Since you can’t properly meet requirements with a Light Switch on, it’s a solid offense. Running with a malfunction is bad for the vehicle since it forces the other pistons to work extra hard to propel the car going.

How serious is this repair?

The adjacent cylinder will be strained as a consequence, and components such as engine parts, fuel injectors, and other coil sets will burn out quicker. If not resolved promptly, this condition is proven to cause motor glitches, which can destroy or block the catalytic converter.

What repairs can resolve the P0352 error code?

  • Replacing the coil pack 
  • Replacing the spark plugs 
  • Fixing a vacuum leak caused by a leaky inlet manifolds cover or a damaged suction tube.
  • Replacing the Engine Management Unit 

It is highly recommended that the Hertz signals from the ECM to the coil pack be verified. It’s also good to look for vacuum leakage in the inlet manifold.

Your Expert sends qualified portable mechanics to your home or business to analyze and fix your automobile.

Finishing Touch

Because this code can affect the vehicle’s performance, it can also put the driver’s health & wellbeing in danger. As a result, this error code needs to be identified and fixed as quickly as feasible