Description of DTC P0357
OBD2 Error Codes

P0357 Ignition coil primary/secondary circuit malfunction ā€œGā€

26.05.2022 /

P0357 ā€“ OBD-II Trouble Code Technical Description

Trouble code P0357 is a trouble code that indicates there is a problem with the primary or secondary winding of ignition coil ā€œGā€ (ignition coil 7)

What does the fault code mean P0357?

Trouble code P0357 indicates an identified problem with the primary or secondary winding of the ignition coil ā€œGā€. The ignition coil functions as a transformer that converts low-voltage voltage from the battery into the high-voltage voltage necessary for successful combustion of the fuel.

Fault code P0357.

Possible reasons

Some possible reasons for the P0357 trouble code:

  • Defective or damaged ignition coil.
  • Problems with the electrical circuit connecting the ignition coil to the engine control module (ECM).
  • Incorrect connection or short circuit in the ignition coil wires.
  • A malfunction in the ECM causing incorrect processing of signals from the ignition coil.
  • Damaged or corroded ignition coil or ECM connectors.
  • Problems with other ignition system components, such as spark plugs or wires.

These are just a few reasons, and diagnosis may require more detailed analysis to pinpoint the root of the problem.

What are the symptoms of a fault code? P0357?

Symptoms for DTC P0357 may vary depending on the specific conditions and condition of the vehicle:

  • Flashing Check Engine Light: When a P0357 code appears, the Check Engine Light or MIL (Malfunction Indicator Lamp) may illuminate on your vehicle's instrument panel, indicating a problem with the ignition system.
  • Unstable engine operation: A faulty ignition coil can cause the engine to run rough, misfire, or even lose power.
  • Engine shaking or shaking: If the ignition coil malfunctions, vibrations or shaking may occur in the engine area.
  • Degraded fuel economy: Incorrect ignition can lead to poor fuel economy due to inefficient combustion of the fuel mixture.
  • The appearance of smoke from the exhaust pipe: Uneven combustion of the fuel mixture can lead to the appearance of black smoke in the exhaust gases.
  • The engine goes into emergency mode: In some cases, the engine management system may put the vehicle into limp mode to prevent damage to the engine or catalytic converter.

These symptoms may manifest differently depending on the specific conditions and characteristics of the vehicle. If you suspect an ignition coil problem or P0357 code, it is recommended that you have a qualified technician diagnose and repair it.

How to diagnose a fault code P0357?

To diagnose DTC P0357, follow these steps:

  1. Checking the Check Engine indicator: First, you should check to see if the Check Engine light on your dashboard comes on. If so, this indicates a problem with the ignition system or other engine control systems.
  2. Using the diagnostic scanner: To determine the specific cause of the P0357 code, you must connect a diagnostic scanner to the vehicle's OBD-II port and read the trouble codes. The scanner will allow you to determine the specific ignition coil that caused the error.
  3. Checking wiring and connections: Check the condition of the wiring and connections to the ignition coil ā€œGā€. Make sure the wires are intact, free of corrosion, and well connected to the coil and to the ECM.
  4. Checking the condition of the ignition coil: Check the condition of the ignition coil ā€œGā€ for damage, corrosion or other visible defects. You can also check the coil winding resistance using a multimeter.
  5. Checking other components: In addition to the ignition coil, it is also worth checking other components of the ignition system such as spark plugs, wires, battery terminals and the ECM.
  6. Carrying out repairs: Once the specific cause of the malfunction has been identified, appropriate repairs or replacement of parts must be carried out. This may include replacing the ignition coil, fixing damaged wiring, or repairing the ECM.

If you do not have experience in diagnosing and repairing vehicles, it is recommended that you contact a qualified auto mechanic or auto repair shop for assistance.

Diagnostic errors

When diagnosing DTC P0357, the following errors may occur:

  • Incorrect interpretation of data: One of the mistakes may be incorrect interpretation of the data received from the diagnostic scanner. This may lead to incorrect identification of the problem ignition coil or other ignition system components.
  • Insufficient check: If you do not perform a complete check of all ignition system components, you may miss other potential causes of the P0357 trouble code. For example, insufficient inspection of wiring, battery terminals, or other components may result in an incorrect diagnosis.
  • Unsuccessful replacement of parts: When replacing the ignition coil or other ignition system components, an error may occur in selecting the correct part or installing it. This may lead to further problems and malfunctions.
  • Incorrect ECM programming: If the Engine Control Module (ECM) is being replaced, incorrect programming or tuning of the new ECM may cause the ignition system to malfunction and cause DTC P0357 to set.
  • Ignoring other errors: Sometimes the P0357 trouble code can be caused by other problems in the vehicle's system that also need to be taken into account when diagnosing. For example, problems with the electrical system or fuel system can cause the ignition system to malfunction.

To successfully diagnose and resolve the P0357 trouble code, it is important to ensure that all steps are followed correctly and that all possible causes and factors are taken into account.

How serious is the fault code? P0357?

Trouble code P0357 is serious because it indicates a problem in the vehicle's ignition system. A faulty ignition coil can cause the engine cylinder to malfunction, which can result in poor engine performance, poor fuel economy, and even damage to the catalytic converter. Moreover, if the problem is not resolved, it may lead to engine failure. Therefore, it is recommended that you immediately contact a qualified auto mechanic to diagnose and repair the problem.

What repair will help eliminate the code? P0357?

To resolve code P0357, follow these steps:

  1. Check the ignition coil: Check the condition of the ignition coil, its connection and wires. If the ignition coil is damaged or has electrical problems, replace it.
  2. Check Wires: Check the condition of the wires connecting the ignition coil to the engine control module (ECM). Make sure the wires are not damaged and that all connections are secure.
  3. Check Engine Control Module (ECM): If the problem is not with the ignition coil or wires, there may be a problem with the vehicle's Engine Control Module (ECM). Perform additional diagnostics to determine if the ECM is operating properly.
  4. Replacement of faulty parts: Once the cause of the malfunction has been identified, replace the faulty parts.
  5. Clear the DTC: After repairing or replacing the faulty parts, clear the DTC using a diagnostic tool or disconnect the battery for a few minutes.

If you do not have the necessary experience or tools to perform such repairs, it is recommended that you contact a qualified auto mechanic or auto repair shop.

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P0357 ā€“ Brand-specific information

Trouble code P0357 refers to the ignition system and concerns the ignition coil ā€œGā€, some car brands and their meanings:

Remember, these are just some of the car brands and each may have their own systems and specifications, so it's always best to check the reference literature or service manual for your specific car model.

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