Description of the P0680 fault code.
OBD2 Error Codes

P0680 Cylinder 10 Glow Plug Circuit Malfunction

26.05.2022 /

P0680 – OBD-II Trouble Code Technical Description

Trouble code P0680 is a generic code that indicates a fault in the cylinder 10 glow plug circuit.

What does the fault code mean P0680?

Trouble code P0680 indicates a problem with the glow plug control circuit in the engine ignition system. This error can occur in various types of vehicles, including diesel and gasoline engines. Typically, this code indicates problems with the engine control module (ECM) or electrical components related to the power or glow plug control circuits.

When the ECM detects a malfunction in the glow plug circuit, it can put the engine into limited power or cause other engine performance problems.

Fault code P0680.

Possible reasons

Some of the possible reasons that could trigger the P0680 trouble code are:

  • Defective glow plugs: Glow plugs can fail due to wear or damage. This may result in insufficient heating of the cylinders when starting the engine.
  • Problems with wiring or connections: Opens, short circuits or oxidation in the electrical circuit associated with the glow plug control can cause the P0680 code.
  • Malfunctions in the engine control module (ECM): Problems with the engine control module itself can cause the glow plugs to malfunction and cause trouble code P0680 to appear.
  • Sensor Issues: Faulty sensors such as engine temperature sensors or crankshaft position sensors can affect the proper operation of the glow plug control system.
  • Car electrical problems: For example, improperly installed or defective fuses, relays, or other electrical system components can cause a P0680 code.

To determine the exact cause of the P0680 code, it is recommended that you consult a qualified technician or the service manual for your specific make and model of vehicle.

What are the symptoms of a fault code? P0680?

Symptoms associated with a P0680 code can vary depending on the specific cause and context in which it occurs. Some common symptoms that may be associated with this trouble code are:

  • Problems with starting the engine: It may be difficult to start the engine, especially in cold weather or during cold starts.
  • Unstable engine operation: The engine may experience rough operation at idle or when driving, resulting in shaking, loss of power, or rough operation.
  • Power limitation: The ECM may place the engine in a power limited mode to protect against possible damage or to prevent further problems.
  • Glow plug system emergency shutdown: If a malfunction is detected, the control system can temporarily turn off the glow plugs to prevent damage or to protect against fire.
  • Error messages appear on the instrument panel: Many vehicles are equipped with diagnostic systems that may indicate P0680 or other engine problems on the instrument panel.

How to diagnose a fault code P0680?

Diagnosing the P0680 trouble code requires a systematic approach and may vary depending on the specific make and model of vehicle, the following steps may assist in the diagnosis:

  1. Scan error code: Use a diagnostic scanner to read error codes from the engine management system. If you have a P0680 code, make sure it is a primary error code and not a minor code.
  2. Checking the glow plugs: Check the glow plugs for wear, damage or short circuits. If problems are found, replace the glow plugs.
  3. Electrical circuit check: Check the electrical circuit, connections and wires related to the glow plug control. Pay attention to breaks, corrosion or short circuits.
  4. Checking the glow plug relay: Check that the relay that controls the glow plugs is functioning correctly. If the relay fails, replace it.
  5. Checking the Engine Control Module (ECM): Check the ECM for defects or malfunctions. This may include checking the voltage and signals to the ECM.
  6. Checking sensors and additional components: Check sensors such as engine temperature sensors, crankshaft position sensors and others that may affect the glow plug control system.
  7. Determining the cause of the malfunction: After completing the above steps, determine the specific cause of the P0680 code and take the necessary repair steps.

If you are unsure of your diagnostic skills, it is recommended that you contact a qualified auto mechanic or service center for professional assistance.

Diagnostic errors

When diagnosing DTC P0680, you may experience the following errors or difficulties:

  • Insufficient diagnostic training: Inexperienced technicians may not have sufficient experience or knowledge to properly diagnose the glow plug control system and its components.
  • Incomplete diagnosis: The mistake is that diagnostics can focus on only one component, such as the glow plugs, and ignore other potential causes, such as wiring or ECM problems.
  • Incorrect component replacement: Without proper diagnosis, you may make the mistake of replacing components (such as glow plugs or relays) unnecessarily, resulting in unnecessary costs and incorrect repair of the problem.
  • Unaccounted external factors: Sometimes external factors such as corrosion of connections or vibrations can be the cause of a problem that may not be easily identified without special tools or additional diagnostic time.
  • Incorrect interpretation of scanner data: Data received from the diagnostic scanner may be incorrectly interpreted, which may lead to incorrect conclusions about the cause of the problem.

To avoid these errors, it is important to have an experienced technician with sufficient knowledge of the ignition system, as well as use the correct diagnostic equipment and carefully follow the troubleshooting procedures outlined in the service manual for your specific vehicle make and model. If you are not confident in your skills, it is better to seek help from a qualified auto mechanic or service center.

How serious is trouble code P0680?

Trouble code P0680, which indicates problems with the glow plug control circuit, is quite serious, especially for diesel vehicles where the glow plugs play a key role in the engine starting process, there are several reasons why trouble code P0680 can be serious:

  • Problems with starting the engine: A malfunction in the glow plugs or their control can lead to difficulty starting the engine, especially on cold days or when parked for long periods of time.
  • Negative impact on performance: Improper glow plug operation can affect engine performance, causing rough running or loss of power.
  • Increased engine wear: Consistent starting problems or improper engine operation can lead to increased wear on engine components such as pistons, crankshaft and others.
  • Power limitation: If a problem is detected with the glow plug control, the engine control system may place the engine in a power-limited mode, which will reduce vehicle performance.
  • Potential risk of breakage while driving: If a glow plug control problem occurs while driving, it can create a dangerous situation on the road, especially if the engine fails.

Overall, the P0680 trouble code requires serious attention and timely repair to avoid additional engine problems and ensure safe and reliable operation of the vehicle.

What repair will help eliminate the code? P0680?

Resolving the P0680 trouble code depends on the specific cause of the problem, there are several possible repair steps that may help correct this error:

  1. Replacing the glow plugs: If the glow plugs are worn, damaged or faulty, replacing them may solve the problem. It is recommended to use quality glow plugs that meet the manufacturer's specifications.
  2. Checking and replacing wiring: Diagnose the electrical circuit, including the wiring and connections associated with the glow plug control. If damage or corrosion is found, replace the appropriate components.
  3. Replacing the glow plug relay: Check the operation of the glow plug relay and replace it if necessary. A defective relay can cause the glow plugs to malfunction and therefore cause P0680.
  4. Checking and repairing the engine control module (ECM): If the ECM is found to be faulty, it may require repair or replacement. This can be a complex and expensive procedure, so it is recommended that you seek professional help.
  5. Diagnosis and replacement of sensors or other components: Check the operation of sensors such as engine temperature sensors, crankshaft position sensors and others, and replace them if faulty.

Repairing the P0680 trouble code should be performed by an experienced technician who will perform a thorough diagnosis and determine the specific cause of the problem. Replacing components yourself without first diagnosing them may lead to additional problems or ineffective troubleshooting.

How to Fix P0680 Engine Code in 3 Minutes [2 DIY Methods / Only $9.86]

P0680 – Brand-specific information

Specific descriptions and interpretations of the P0680 trouble code may vary slightly depending on the vehicle manufacturer, a few examples for various car brands:

Please refer to the service manual or authorized dealer of your specific vehicle brand for more detailed specifications and recommendations for troubleshooting this problem.

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