P0679 Volkswagen Code - Cylinder 9 Glow Plug Circuit Fault
Quick Answer
The P0679 diagnostic trouble code (DTC) for Volkswagen vehicles specifically relates to a fault in the cylinder 9 glow plug circuit. Common causes include Faulty glow plug in cylinder 9, Wiring or connection issues in the glow plug circuit, Faulty glow plug control module. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0679 Volkswagen indicates Cylinder 9 Glow Plug Circuit Fault.
- Common causes
- Common causes include Faulty glow plug in cylinder 9, Wiring or connection issues in the glow plug circuit, Faulty glow plug control module.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code P0679 Volkswagen Description
The P0679 diagnostic trouble code (DTC) for Volkswagen vehicles specifically relates to a fault in the cylinder 9 glow plug circuit. Glow plugs are essential components in diesel engines that heat up the combustion chamber to facilitate cold starts. In this case, the code indicates that there is an issue with the glow plug circuit in cylinder 9, which can lead to difficulties starting the engine, decreased fuel efficiency, and increased emissions. When the glow plug circuit malfunctions, it can prevent proper combustion, leading to rough idling, misfires, and even engine stalling. Ignoring this issue can result in further damage to the engine and exhaust system over time.
Common Causes of P0679 Volkswagen
- Faulty glow plug in cylinder 9
- Wiring or connection issues in the glow plug circuit
- Faulty glow plug control module
- Corrosion or damage to the glow plug circuit components
- Engine control module (ECM) issues
Symptoms of P0679 Volkswagen
- Difficulty starting the engine, especially in cold weather
- Rough idling or engine misfires
- Decreased fuel efficiency
- Increased emissions
- Engine stalling
How to Fix P0679 Volkswagen
- Diagnose the specific glow plug in cylinder 9 using a multimeter to check for continuity and resistance.
- Inspect the wiring and connections in the glow plug circuit for any damage or corrosion.
- Test the glow plug control module for proper function and replace if necessary.
- Clear the DTC from the ECM using an OBD-II scanner after completing repairs.
- Test the vehicle to ensure proper starting and operation after the repair is complete.
Cost to Fix P0679 Volkswagen
The cost of repairing a cylinder 9 glow plug circuit fault can vary depending on the specific issue and the labor rates in your area. Generally, replacing a faulty glow plug or repairing wiring/connectivity issues can cost between $100 and $300. However, if the glow plug control module needs to be replaced, the total repair cost could range from $200 to $500. Keep in mind that diagnostic time and labor rates at auto repair shops can impact the overall cost, so it's advisable to get a quote from a trusted mechanic before proceeding with the repairs.
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Frequently Asked Questions about P0679 Volkswagen Code
1. What are the common symptoms of OBDII code P0679 in a Volkswagen related to the Cylinder 9 Glow Plug Circuit Fault?
The common symptoms include hard starting, rough idling, misfires, and an illuminated check engine light.
2. What are the possible causes of the P0679 code in a Volkswagen indicating a Cylinder 9 Glow Plug Circuit Fault?
Possible causes can include a faulty glow plug, damaged wiring or connectors in the glow plug circuit, a defective glow plug relay, or a problem with the engine control module (ECM).
3. How can I diagnose the Cylinder 9 Glow Plug Circuit Fault in my Volkswagen when encountering the P0679 trouble code?
Diagnosis typically involves checking the glow plug and related components for proper functioning, inspecting the wiring and connectors for damage, and using a scan tool to monitor the glow plug circuit.
4. Can I continue driving my Volkswagen with the P0679 code indicating a Cylinder 9 Glow Plug Circuit Fault?
It is not recommended to continue driving with this fault as it can lead to poor engine performance and potential damage over time. It's best to address the issue promptly.
5. Is it possible to repair the Cylinder 9 Glow Plug Circuit Fault in my Volkswagen on my own?
While some DIY enthusiasts may attempt to address this issue, it is recommended to have a qualified mechanic diagnose and repair the problem to ensure proper resolution.
6. How much does it typically cost to repair the Cylinder 9 Glow Plug Circuit Fault related to the P0679 code in a Volkswagen?
The cost of repairs can vary depending on the exact cause of the fault, but it may involve replacing the faulty glow plug, repairing damaged wiring, or addressing issues with the glow plug relay. Costs can range from a few hundred to over a thousand dollars.
7. Can a Cylinder 9 Glow Plug Circuit Fault in a Volkswagen trigger other OBDII trouble codes?
Yes, a fault in the glow plug circuit can sometimes trigger related codes such as P0671 to P0684, which are specific to glow plug circuit issues in different cylinders.
8. How crucial is it to address the P0679 code indicating a Cylinder 9 Glow Plug Circuit Fault promptly in my Volkswagen?
Promptly addressing this fault is important to ensure proper starting, combustion, and overall engine performance. Ignoring the issue can lead to more severe problems over time.
9. Are there any preventive maintenance tips to avoid encountering the P0679 code related to the Cylinder 9 Glow Plug Circuit Fault in a Volkswagen?
Regularly inspecting the glow plug system, ensuring proper glow plug operation in cold weather, and addressing any starting or rough idling issues promptly can help prevent this fault.
10. Can extreme weather conditions or driving habits contribute to the occurrence of the P0679 code indicating a Cylinder 9 Glow Plug Circuit Fault in a Volkswagen?
Yes, cold weather, frequent short trips, or extended idling can put additional stress on the glow plug system, potentially leading to faults like the Cylinder 9 Glow Plug Circuit Fault indicated by the P0679 code.
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