The P0680 Volkswagen code identifies a malfunction within the ECM/PCM power relay sense circuit. This circuit is crucial for the vehicle's ECM and PCM to operate effectively, and its failure can lead to several engine issues. Symptoms include difficulty starting, especially in cold weather, rough idling, misfires, and increased exhaust smoke. Common causes range from a faulty glow plug in cylinder 10 to damaged wiring or a defective glow plug relay. Diagnosis requires an OBD-II scanner, multimeter, and potentially, glow plug testers. Repair costs typically fall between $150 and $450. A quick resolution prevents further complications within the vehicle system.
P0680 VW Code Meaning
When you see the P0680 code on a Volkswagen, it means there's an issue with the ECM/PCM power relay sense circuit. This part is key for the engine control module (ECM) and powertrain control module (PCM) to work properly.
The P0680 code is part of the On-Board Diagnostics II (OBD-II) system, which checks the car's engine and emission systems.
The code shows up if the ECM finds an open circuit or problem with the relay's sensing circuit. This can make it hard to start the car. It's good to spot these problems early to keep the car running well.
To fix this, check the ECM/PCM power relay and look at the wiring for any damage or loose connections. Knowing what the P0680 code means helps keep Volkswagen cars in good shape.
Error Code P0680 Symptoms
If your Volkswagen shows a P0680 error code, it's likely due to problems with the glow plug in cylinder 10. This can cause several noticeable issues with your car.
First, if the check engine light is on, it's a sign that something might be wrong with the engine's glow plug system. You should check this out soon to avoid bigger problems.
Here are some other signs you might notice:
- Trouble Starting: Your car might have trouble starting, especially in cold weather. The glow plug helps with starting the engine when it's cold, so a faulty one can cause issues.
- Rough Idling or Misfires: The engine might not run smoothly, causing it to shake or make odd noises.
- More Smoke: You might see more black smoke from your car's exhaust. This happens because the engine isn't burning fuel properly.
These problems can lead to lower fuel efficiency and affect how your car runs. It's a good idea to get your car checked and fixed to keep it running well.
Causes of VW P0680 Fault Code
The VW P0680 fault code often pops up because of a bad glow plug in cylinder 10. Glow plugs warm up the engine to help it start, especially when it's cold. If one isn't working right, the car might struggle to start on chilly mornings.
Here are some other reasons you might see this fault code:
- Wiring Problems: If wires are damaged or connections are loose in the glow plug circuit, it can mess up the power supply needed for the glow plugs.
- Bad Glow Plug Relay: This relay sends power to the glow plugs. If it's not working, the plugs might not get the power they need, and this error code can show up.
- Engine Control Module (ECM) Issues: The ECM checks and controls the glow plug circuits. If it has problems, like rust or damage, it can cause communication issues, which might trigger this fault code.
Tools Needed to Diagnose
To find out what's wrong with the P0680 fault code in a Volkswagen, you'll need a few tools. This code usually has to do with the ECM/PCM power relay sense circuit. Here's what you need:
- Digital Multimeter: Use this to check voltage and resistance in the glow plug circuit. It helps find electrical issues by giving accurate readings.
- OBD-II Scanner: This tool reads and clears diagnostic trouble codes. It helps you understand what's causing the P0680 code, so you can fix it.
- Wiring Diagram: A detailed diagram helps you follow the glow plug circuit. This makes it easier to spot any problems in the electrical path.
Also, using a glow plug tester is a good idea to check if the glow plug in cylinder 10 works.
Basic tools like wrenches and screwdrivers are needed too, in case you need to replace anything faulty in the circuit.
How to Fix P0680 VW Error Code – Step by Step
Step 1:
Begin by using a diagnostic scanner to confirm the presence of the P0680 error code in your Volkswagen.
Check for any additional trouble codes, as they may provide further context and addressing them can prevent future complications.
Step 2:
Inspect the glow plug in cylinder 10.
Verify its functionality and ensure it is neither burnt out nor damaged. A defective glow plug can cause starting issues, particularly in colder climates.
Replace the glow plug if necessary.
Step 3:
Examine the associated wiring and connections for signs of corrosion, damage, or loose connections that could disrupt the circuit.
Proper connectivity is crucial for maintaining the electrical flow needed for the glow plug's operation.
Step 4:
Test the glow plug relay.
A malfunctioning relay can prevent the glow plug from receiving the necessary power. If the relay is faulty, replacement is required.
Step 5:
After addressing all identified issues, reset the fault code using the scanner.
Conduct a test drive to confirm the resolution of the problem, ensuring the system's functionality and reliability.
Common Diagnosis Mistakes
Misdiagnosing the P0680 error code in a Volkswagen can lead to unnecessary repairs. Here are common mistakes technicians make:
- Glow Plug Assumptions: Technicians sometimes think the glow plug is the problem without checking the wires and connections. This can result in changing a good glow plug while the real issue continues.
- Ignoring the Glow Plug Relay: Technicians might forget to test the glow plug relay. If it's not working right, it can cause the P0680 code. Missing this step can lead to changing parts that are fine and not fixing the real problem.
- Skipping Diagnostic Scanners: Not using a diagnostic scanner to find the exact fault code can lead to mistakes. Diesel engines can show similar signs for different problems, so it's important to find the exact issue.
Sometimes, a problem with the engine control module (ECM) can also cause the P0680 code.
After repairs, it's necessary to reset the fault code and test the vehicle to ensure the problem is fixed.
P0680 VW Repair Cost
Repairing the P0680 error code in a Volkswagen can cost between $150 and $450, depending on what's wrong.
Parts needed, like glow plugs or relays, usually range from $50 to $150. These parts help the engine start and run smoothly in diesel vehicles.
Labor costs to diagnose and fix the P0680 code can be between $100 and $300. The price varies based on how long it takes and the skill needed to solve the issue.
Costs might be higher in cities where living expenses are more compared to rural areas.
To get a clear idea of how much you'll spend, talk to a skilled mechanic. They can find out what's causing the problem and fix it properly. This helps prevent future issues and keeps expenses in check.
Related Error Codes on Volkswagen
When you see the P0680 code in a Volkswagen, you should also look at related codes to find possible problems. Codes like P0670 and P0671 to P0674 show issues with the glow plug or heater circuits. They may point to problems in single cylinders or the pre-heating system, which is important for diesel engines. Ignoring these can cause starting problems and more pollution.
Other codes like P0681, P0682, and P0683 can show voltage issues or problems in the glow plug circuit. Fixing these helps avoid bigger electrical problems. The P0680 code might mean there are larger electrical issues, so you should check other Diagnostic Trouble Codes (DTCs) to find problems with parts like the ECM or wiring.
| Error Code | Description |
|---|---|
| P0380 | Glow Plug/Heater Circuit A Problem |
| P0670-74 | Glow Plug Circuit Issues in Cylinders |
| P0681-83 | Glow Plug Circuit Voltage Problems |
Checking and fixing these codes keeps your car running well and avoids more engine problems.
Can I drive safely with P0680 VW?
No, it's not safe to drive with the P0680 code in your VW.
This code means there's a problem with the car's engine parts, making it hard to start and run well.
Fix it soon to avoid bigger problems and keep your car safe.
People Also Ask
What Is the History of the P0680 Code in Volkswagen Models?
The P0680 code often happened in Volkswagen diesel cars, especially in cold places, because of glow plug problems. To fix this, Volkswagen improved the car's computer system to make starting the car in cold weather easier and more reliable.
How Does the P0680 Code Affect Fuel Efficiency?
The P0680 code means there is a problem with the glow plug circuit in a diesel engine. This can make it hard to start the engine and cause it to run poorly, wasting fuel. Fixing this problem helps the engine run better and use less fuel.
Are There Any Recalls Related to the P0680 Code in Volkswagen?
Volkswagen has not made any recalls for the P0680 code, which is about glow plug problems, as of October 2023. It's a good idea to check the NHTSA website for updates or ask a dealer if your car model might have any recalls.
What Are the Long-Term Effects of Ignoring the P0680 Code?
Ignoring the P0680 code can cause your car to have trouble starting, wear out the engine faster, and make more pollution. It might also harm the car's computer. This can lead to expensive repairs and problems following the rules for car emissions.
How Does the P0680 Code Impact Vehicle Performance Diagnostics?
The P0680 code makes it harder to find car problems because it can hide other issues like a bad ECM or relay. This might lead to wrong guesses about what's wrong, causing problems like a bumpy engine, less power, and more pollution. Careful checking is needed.