P0358 - IGNITION COIL H PRIMARY / SECONDARY CIRCUIT MALFUNCTION

The low voltage side of the ignition system is known as the primary circuit. This includes the battery, the ignition switch, the primary coil winding, an activation system and a switching device. On the other hand, the high voltage side of the system is known as the secondary circuit. In this is the package of coils and spark plugs. Many ignition components are not used in many engines today. Instead, they use only one package of coils which is above the spark plug. This package transforms the low voltage of the primary circuit into a high secondary voltage which is necessary to activate the plugs.

The coil pack circuit is controlled by the PCM (Powertrain Control Module) who connects or disconnects this circuit and thus activates or deactivates the coil. The PCM establishes diagnostic code P0358 OBD2 when it detects inconsistencies in the electrical circuit of the ignition coil. This code refers to ignition coil number 8.

• Check Engine lamp on.
• Difficulty starting the engine.

The fault code P0358 OBDII is stable because they exist:

• Problems with the circuit that controls the coil.
• Bad coil circuit electrical connections.
• Coil number 8 could be in bad condition.

The steps for the correct diagnosis of the DTC code P0358 OBD2 are:

• Performs an inspection of the coil package. It is also necessary to check the connector. If you find broken or frayed cables proceed to repair or replace.
• If there is currently an ignition failure in one cylinder, change the coil to another cylinder. If the scanning tool shows that the fault has changed to the cylinder that has the exchanged coil, the coil is defective. You must replace it. If not, the problem is in the circuit that controls the coil.
• Without connecting the coil, check the DC voltage in the drive circuit at the coil connector. If you find a voltage in that cable that indicates a short, you should repair it.