AutoCodesVolkswagen – P0671 Volkswagen

P0671 Volkswagen Code - Cylinder 1 Glow Plug Circuit Fault

Quick Answer

The glow plug system is used to assist in providing the heat required to begin combustion during cold engine temperatures. Common causes include Faulty cylinder #1 glow plug, Cylinder #1 glow plug harness is open or shorted, Cylinder #1 glow plug circuit poor electrical connection. 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
P0671 Volkswagen indicates Cylinder 1 Glow Plug Circuit Fault.
Common causes
Common causes include Faulty cylinder #1 glow plug, Cylinder #1 glow plug harness is open or shorted, Cylinder #1 glow plug circuit poor electrical connection.
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 Popularity 25,011
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Jul 18, 2022
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Code P0671 Volkswagen Description

The glow plug system is used to assist in providing the heat required to begin combustion during cold engine temperatures. The glow plugs are heated before and during cranking, as well as initial engine operation. The Engine Control Module (ECM) controls the glow plug ON times by monitoring coolant temperature and glow plug voltage. The California Glow Plug system has eight individual glow plug supply circuits between the controller and the glow plugs. If the feedback voltage from the controller to the ECM is not within range, the ECM sets the OBDII code.
OBDII Code P0671 Volkswagen - Cylinder 1 Glow Plug Circuit Fault - AutoCodes.com
P0671 Volkswagen Code - Cylinder 1 Glow Plug Circuit Fault

What are the Possible Causes of the DTC P0671 Volkswagen?

  • Faulty cylinder #1 glow plug
  • Cylinder #1 glow plug harness is open or shorted
  • Cylinder #1 glow plug circuit poor electrical connection
  • Faulty glow plug module

How to Fix the DTC P0671 Volkswagen?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

Code Tech Notes

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0671 Volkswagen code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0671 Volkswagen code?

Need more information on how to fix the P0671 Volkswagen code? Get Access to Factory Service Manuals

Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0671 Volkswagen Code

1. What are common symptoms of OBDII code P0671 in a Volkswagen related to the Cylinder 1 Glow Plug Circuit Fault?

- Common symptoms include hard starting, rough idling, loss of power, increased emissions, and the illumination of the check engine light.

2. What causes the OBDII code P0671 in a Volkswagen indicating an issue with the Cylinder 1 Glow Plug Circuit Fault?

- The code P0671 typically indicates a fault in the wiring, connections, or the glow plug itself in the cylinder 1 circuit of the Volkswagen's diesel engine.

3. How can I diagnose the OBDII code P0671 in a Volkswagen related to the Cylinder 1 Glow Plug Circuit Fault?

- Diagnosing the code involves checking the glow plug resistance, inspecting the wiring for damage, and testing the connections using a multimeter.

4. Can I still drive my Volkswagen with the OBDII code P0671 for the Cylinder 1 Glow Plug Circuit Fault?

- It is not recommended to drive the vehicle with a glow plug circuit fault as it can lead to performance issues and potential damage to the engine, especially in colder weather.

5. What are the repair options for fixing the OBDII code P0671 in a Volkswagen due to the Cylinder 1 Glow Plug Circuit Fault?

- Repair options include replacing the faulty glow plug, repairing damaged wiring or connections, resetting the fault code, and ensuring proper functioning of the glow plug circuit.

6. Are there any preventive maintenance tips to avoid the OBDII code P0671 related to the Cylinder 1 Glow Plug Circuit Fault in a Volkswagen?

- Regularly inspecting and testing the glow plugs, as well as keeping the engine well-maintained and using high-quality diesel fuel, can help prevent issues with the glow plug circuit.

7. How can I reset the check engine light after addressing the OBDII code P0671 for the Cylinder 1 Glow Plug Circuit Fault in my Volkswagen?

- You can reset the check engine light using an OBDII scanner or by disconnecting the car's battery for a few minutes, but it is important to ensure that the underlying issue has been resolved first.

8. Is it necessary to replace all glow plugs if only one is causing the OBDII code P0671 in a Volkswagen?

- While replacing all glow plugs is not always necessary, it is recommended to inspect the condition of all glow plugs and replace any that show signs of wear or failure to prevent future issues.

9. What are the potential risks of ignoring the OBDII code P0671 for the Cylinder 1 Glow Plug Circuit Fault in a Volkswagen?

- Ignoring the code can lead to decreased engine performance, difficulty starting the vehicle, increased emissions, and potential damage to the engine over time.

10. How long does it typically take to repair the OBDII code P0671 related to the Cylinder 1 Glow Plug Circuit Fault in a Volkswagen?

- The repair time can vary depending on the extent of the issue, but replacing a glow plug or repairing wiring connections usually takes around 1-2 hours at a professional repair shop.

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