Description of the P0675 fault code.
OBD2 Error Codes

P0675 Cylinder 5 Glow Plug Circuit Malfunction

26.05.2022 /

P0675 – OBD-II Trouble Code Technical Description

Trouble code P0675 is a generic code that indicates a fault in the cylinder 5 glow plug circuit.

What does the fault code mean P0675?

Trouble code P0675 indicates a problem with the cylinder 5 glow plug circuit. In diesel engines, glow plugs are used to preheat the air in the cylinder before starting the engine when cold. Each cylinder is usually equipped with its own glow plug, which helps in preheating the cylinder head. Code P0675 indicates that the engine control module (PCM) has detected an unusual voltage in the cylinder 5 glow plug circuit that is not within manufacturer specifications.

Fault code P0675.

Possible reasons

Some possible reasons for the P0675 trouble code:

  • Defective glow plug: The most common cause is a faulty cylinder 5 glow plug. This may be caused by wear, damage or failure of the glow plug.
  • Electrical circuit problems: Opens, short circuits or other problems with the electrical wiring, connections or connectors in the glow plug circuit may cause the error.
  • Faulty engine control module (PCM): Problems with the PCM, which controls the glow plugs, can cause the P0675 code to appear.
  • Problems with other sensors or systems: Malfunctions in other systems or sensors, such as the ignition system, fuel injection system, or emission control system, can also cause P0675.
  • Mechanical problems: For example, compression problems in cylinder 5 or other mechanical problems that interfere with normal engine operation.
  • Alternator or battery problems: Low voltage in the vehicle's electrical system can also cause P0675.

These reasons should be considered in the context of the specific vehicle, its condition and operating conditions.

What are the symptoms of a fault code? P0675?

Symptoms for DTC P0675 related to a cylinder 5 glow plug problem may include the following:

  • Difficulty starting the engine: If the glow plug is not functioning properly, it may be difficult to start the engine, especially on cold days.
  • Uneven engine operation: A faulty glow plug can cause the engine to run rough, especially when running cold.
  • Loss of power: If the glow plug of cylinder 5 is faulty, power loss and deterioration in engine dynamics may occur.
  • Increased emissions: A faulty glow plug can lead to increased emissions of harmful substances such as carbon deposits or exhaust smoke.
  • Flashing of the Check Engine indicator: When P0675 occurs, the Check Engine light on your vehicle's dashboard will turn on.
  • Other error codes appear: Sometimes other related trouble codes may appear along with the P0675 code, indicating problems in other vehicle systems, such as the fuel injection system or ignition system.

How to diagnose a fault code P0675?

To diagnose DTC P0675, follow these steps:

  1. Check the error code: Use an OBD-II scanner to read the P0675 error code and any other codes that may have appeared. Record any detected error codes for further analysis.
  2. Visual inspection: Inspect the wiring and connectors connecting the cylinder 5 glow plug to the engine control module (PCM). Check them for signs of damage, corrosion or breaks.
  3. Check the glow plug: Disconnect the wiring from the cylinder 5 glow plug and check the condition of the plug. Make sure it is not worn or damaged and is installed correctly.
  4. Measure resistance: Use a multimeter to measure the resistance of the glow plug. Compare the resulting value with the recommended value for your specific vehicle.
  5. Check the electrical circuit: Check the glow plug electrical circuit for opens or short circuits. Make sure the wiring is properly connected and there is no damage to the wires.
  6. Check Engine Control Module (PCM): Test the PCM for errors or malfunctions using a diagnostic scan tool.
  7. Additional tests: If necessary, perform additional tests such as a compression test on cylinder 5 or other systems that may be related to glow plug operation.

Diagnostic errors

When diagnosing DTC P0675, the following errors may occur:

  • Insufficient diagnosis: Not conducting a complete diagnosis may result in missing important steps and incorrectly identifying the cause of the problem.
  • Incorrect cause identification: The malfunction may not only be related to the glow plugs, but also to other components such as wiring, connectors, engine control module and other systems. Failure to properly identify the source of the problem may result in unnecessary repairs or replacement of components.
  • Incorrect measurement: Incorrect glow plug resistance measurement or electrical circuit test may lead to incorrect conclusions.
  • Ignoring additional tests: Some problems, such as problems with cylinder compression or other vehicle systems, may be due to a faulty glow plug. Ignoring additional tests may result in incomplete diagnosis and incorrect repairs.
  • Misinterpretation of data: Incorrect interpretation of data from a diagnostic scanner or multimeter can lead to incorrect diagnosis and repair.

It is important to carry out a complete and systematic diagnosis, following the recommended procedures and considering all possible causes of the source of the problem.

How serious is the fault code? P0675?

Trouble code P0675 should be considered a serious problem, especially if it remains faulty for an extended period of time or if it is accompanied by severe symptoms such as difficulty starting or loss of power. It is important to understand that a faulty glow plug can result in insufficient cylinder preheating, which in turn can affect fuel ignition, engine performance and emissions.

If code P0675 appears on your vehicle's display, it is recommended that you immediately contact a certified auto mechanic or auto repair shop for diagnosis and repair. Leaving this problem unaddressed can result in additional damage to the engine or other vehicle systems, as well as increased fuel consumption and emissions.

What repair will help eliminate the code? P0675?

Troubleshooting trouble code P0675 involves the following steps:

  1. Replacing the glow plug: If the cylinder 5 glow plug is faulty, it should be replaced with a new one that meets the manufacturer's specifications.
  2. Checking and replacing wiring: The wiring connecting the glow plug to the engine control module (PCM) should be inspected for breaks, corrosion, or other damage. If necessary, the wiring should be replaced.
  3. Checking the Engine Control Module (PCM): The engine control module should be checked for errors or malfunctions using a diagnostic scanner. The PCM may need to be replaced or reprogrammed if necessary.
  4. Additional tests and repairs: If necessary, perform additional tests such as a compression test on cylinder 5 or other systems that may be related to glow plug operation. Based on the diagnostic results, make the necessary repairs or replace the faulty components.
  5. Clearing the error code: After repairing or replacing faulty components, use a diagnostic scan tool to clear the P0675 code from the engine control module (PCM).
  6. Testing and validation: After the repair or replacement is completed, test and perform a system performance check to ensure that the problem is resolved and the error code does not return.
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P0675 – Brand-specific information

Trouble code P0675 refers to errors related to the glow plug system and can occur in various brands of cars, decoding for some brands:

The decoding may vary slightly depending on the specific model and year of manufacture of the car. Please refer to your specific vehicle's repair or service manual for exact information.

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