Description of the P0673 fault code.
OBD2 Error Codes

P0673 Cylinder 3 Glow Plug Circuit Malfunction

26.05.2022 /

P0673 – OBD-II Trouble Code Technical Description

Trouble code P0673 is a general trouble code that indicates a fault in the cylinder 3 glow plug circuit.

What does the fault code mean P0673?

Trouble code P0673 indicates a problem with the cylinder number 3 glow plug. This trouble code typically occurs in diesel engines where glow plugs are used to preheat the air in the cylinders before starting the engine, especially in cold temperatures. Trouble code P0673 indicates that The engine control module (ECM) has detected an abnormal voltage in the cylinder XNUMX glow plug circuit.

Fault code P0673.

Possible reasons

Some possible reasons for the P0673 trouble code:

  • Glow plug malfunction: The most common cause is a failure of the glow plug itself in cylinder number 3. This may include breakage, corrosion or wear.
  • Wiring and connections: Breaks, corrosion or poor contacts in the wiring, connections or connectors associated with the glow plugs can cause electrical problems.
  • Problems with the engine control module (ECM): Malfunctions or errors in the engine control module can cause the P0673 code to erroneously trigger.
  • Problems with the car's electrical system: Voltage, resistance, or other electrical parameters in the glow plug circuit may be affected by problems with the battery, alternator, or other electrical system components.
  • Announced failure: Sometimes the P0673 code may be declared as a result of a temporary failure or problem in the electrical system that does not recur after the error code is cleared.
  • Mechanical problems: Mechanical damage or problems in the engine, such as compression problems, can also cause the P0673 code.

These reasons may be the main factors, but to accurately determine the problem, it is recommended to perform a comprehensive diagnosis of the vehicle using a diagnostic scanner and other specialized equipment.

What are the symptoms of a fault code? P0673?

Some typical symptoms that may accompany trouble code P0673 include:

  • Difficulty starting the engine: One of the most common symptoms is difficulty starting the engine, especially in low temperatures. This is because glow plugs are used to preheat the air in the cylinders before starting.
  • Unstable idle: Problems with one or more cylinders caused by a faulty glow plug can result in rough idle or even loss of idle.
  • Slowdown or loss of power: Faulty glow plugs can also cause engine sluggishness or loss of power, especially at low engine speeds or when accelerating.
  • Distorted engine operation: The engine may run rough or unstable due to cylinder misfiring caused by a faulty glow plug.
  • Sparks or smoke from the exhaust system: If the glow plug is faulty, you may experience a spark or even smoke from the exhaust system, especially when starting or accelerating.
  • Errors on the dashboard: In some cases, the car may display errors on the dashboard related to the engine or ignition system.

These symptoms may occur to varying degrees depending on the nature of the problem and the condition of the vehicle.

How to diagnose a fault code P0673?

The following approach is recommended to diagnose DTC P0673:

  1. Checking Error Codes: Use a diagnostic scan tool to read error codes from the Engine Control Module (ECM). Make sure the P0673 code is indeed present and make a note of other error codes that may indicate related problems.
  2. Checking the glow plugs: Check the condition and operation of the glow plugs, especially in cylinder number 3. Check that the plugs have no visible damage such as breaks, corrosion or soot accumulation. You can also check the resistance of the spark plugs using a multimeter, comparing the results with the manufacturer's recommendations.
  3. Checking wiring and connections: Inspect the wiring and connectors connecting the glow plugs to the engine control module. Make sure the wiring is not damaged, broken or corroded and that the connections are tight.
  4. Checking the Engine Control Module (ECM): Check the operation of the engine control module, ensuring that it correctly interprets the signals from the glow plugs and controls their operation correctly.
  5. Checking the electrical system: Check the vehicle's electrical system, including the battery, alternator and other components that may affect the glow plugs.
  6. Additional tests and measurements: If necessary, perform additional tests and measurements, such as a compression check on cylinder number 3, to rule out mechanical problems.
  7. Determining the cause of the malfunction: Based on the diagnostic results, determine the cause of the malfunction and carry out the necessary repair work.

It is important to diagnose using the correct equipment and follow the manufacturer's instructions to minimize the risk of damage or misdiagnosis. If you do not have experience in diagnosing and repairing vehicles, it is recommended that you contact a qualified auto mechanic or service center.

Diagnostic errors

When diagnosing DTC P0673, the following errors may occur:

  • Incorrect interpretation of error code: The error may occur if the diagnostic scanner incorrectly interprets the error code or if it incorrectly displays the cause of the error code.
  • Incomplete diagnosis: Carrying out only a superficial diagnosis without discovering the depth of the problem may result in incorrect repairs or malfunctions.
  • Skip checking other components: Sometimes the problem can be caused not only by the glow plug, but also by other components of the ignition system or diesel engine. Skipping such checks may result in a failed diagnosis.
  • Misinterpretation of test results: Errors can occur if test results are incorrectly interpreted or measured incorrectly, which may lead to an incorrect conclusion about the condition of the glow plugs or electrical circuit.
  • Faulty equipment or tools: Using faulty or incompatible diagnostic equipment or tools may also result in errors.
  • Improper repair: If the cause of the failure is not correctly identified, it may result in incorrect repairs, which can increase downtime and repair costs.

To avoid these errors, it is important to carry out a comprehensive and systematic diagnosis, use the correct equipment and follow the repair manuals and manufacturer's instructions.

How serious is the fault code? P0673?

Trouble code P0673 is serious, especially if it is related to a faulty glow plug in one of the diesel engine cylinders. It is important to understand that glow plugs play a key role in the engine starting process, especially in low temperature conditions. A faulty glow plug can cause difficult starting, rough running, loss of power and other problems, especially in cold weather.

In addition, the P0673 code may also indicate problems in the glow plug electrical circuit, which also requires serious attention and diagnosis. Problems with the electrical system can cause the glow plugs to malfunction, which can lead to incomplete fuel combustion and increased emissions.

In general, the P0673 code requires immediate attention and diagnosis to prevent further problems with the performance of the engine and its electrical system. It is not recommended to ignore this code as it may cause more serious problems and increase the risk of an accident or engine damage.

What repair will help eliminate the code? P0673?

Resolving the P0673 trouble code depends on the specific cause of this error, some general repair steps that may help:

  1. Replacing the glow plugs: If the cause of the error is a faulty glow plug in cylinder 3, the glow plug must be replaced. Make sure the new spark plug meets the manufacturer's specifications and is installed correctly.
  2. Checking and replacing wiring and connections: Carry out a thorough check of the wiring, connectors and connections associated with the glow plugs. Replace any damaged or corroded wires and ensure a good connection.
  3. Electrical system diagnostics: Check the vehicle's electrical system, including the battery, alternator and other components that may affect the glow plugs. Repair or replacement of faulty components may be necessary.
  4. Checking the Engine Control Module (ECM): Run diagnostics on the engine control module to check its operation and firmware updates. Flash or replace the ECM if necessary.
  5. Checking for Mechanical Problems: Use a comprehensive approach to diagnose mechanical problems, such as compression problems, that may be affecting the performance of cylinder 3. Perform additional tests if necessary.
  6. Clearing the error code: After making all necessary repairs and eliminating the cause of the error, use a diagnostic scan tool to clear the error code from the engine control module (ECM) memory.

It is important to carry out repairs according to the manufacturer's recommendations and use high-quality spare parts. If you are not experienced in car repairs, it is recommended that you contact a qualified auto mechanic or service center to perform repair work.

How to Fix P0673 Engine Code in 3 Minutes [2 DIY Methods / Only $9.25]

P0673 – Brand-specific information

Trouble code P0673 is related to a problem in cylinder 3, the glow plugs. List of some car brands with their decodings:

Keep in mind that the exact meaning of the P0673 code may vary slightly depending on the specific model and year of the vehicle. It is always a good idea to check the specifications and repair manuals for the specific make and model of your vehicle.

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