P0357 - IGNITION COIL G PRIMARY / SECONDARY CIRCUIT MALFUNCTION

Vehicles are equipped with the COP (Coil on Plug) system to provide the ignition spark necessary for the right engine operation. In this system, the coil checks that the engine operates in a specific way to use a spark plug wire for ignition. These ignition coils are electronically controlled by the Powertrain Control Module (PCM).

The DTC P0357 OBDII code is related to the electrical circuit between the PCM and the ignition coil. If any recorded voltage has a difference of more than 10% from the values already set by the manufacturer, this code will be set and the Check Engine light will illuminate.

• MIL light ON.
• A misfire, which may be intermittent or constant.
• Idling deficiencies.

Reason to set the P0357 OBD2 fault code:

• The coil driver circuit may be shorted to voltage or ground.
• A coil connection could be incorrectly tightened.
• The coil may be in bad condition.

To solve the problems related to the P0357 OBDII diagnostic code, take into account the following steps:

• Check the wiring of the number 7 coil. Look for chafing or wear of the wires. If you find some defects, repair or replace them if necessary.
• Check that there is a voltage of 5 to 20 Hertz with a multimeter, which indicates that the controller is working properly. If there is no such voltage, replace the ignition coil.
• Verify that there is continuity from the controller between the Powertrain Control Module and the coil. In case there is no continuity, you may repair the short to ground in the circuit. If it is positive, it means if there is continuity, you can check the resistance between the ground and the coil connector. As a result, you should get infinite resistance. If not, there is a short in the ground circuit, repair it.