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P0671 2018 Chevrolet Silverado Code - Cylinder 1 Glow Plug Circuit Fault

Quick Answer

The P0671 code on a 2018 Chevrolet Silverado indicates a fault in the glow plug circuit for cylinder 1. Common causes include Faulty glow plug: The glow plug in cylinder 1 may be faulty and not heating up properly, Wiring issues: There could be a problem with the wiring harness or connections related to the glow plug circuit, Glow plug control module failure: The control module that manages the glow plugs may be malfunctioning. 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 2018 Chevrolet Silverado indicates Cylinder 1 Glow Plug Circuit Fault.
Common causes
Common causes include Faulty glow plug: The glow plug in cylinder 1 may be faulty and not heating up properly, Wiring issues: There could be a problem with the wiring harness or connections related to the glow plug circuit, Glow plug control module failure: The control module that manages the glow plugs may be malfunctioning.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P0671 2018 Chevrolet Silverado Description

The P0671 code on a 2018 Chevrolet Silverado indicates a fault in the glow plug circuit for cylinder 1. Glow plugs are used in diesel engines to help with cold starts by heating the air in the combustion chamber. When the engine is cold, the glow plug warms up the air to facilitate combustion. A circuit fault in the glow plug system can lead to issues with starting the engine, especially in cold weather conditions.

OBDII Code P0671 2018 Chevrolet Silverado - Cylinder 1 Glow Plug Circuit Fault
P0671 2018 Chevrolet Silverado Code - Cylinder 1 Glow Plug Circuit Fault

Common Causes of P0671 2018 Chevrolet Silverado

  1. Faulty glow plug: The glow plug in cylinder 1 may be faulty and not heating up properly.
  2. Wiring issues: There could be a problem with the wiring harness or connections related to the glow plug circuit.
  3. Glow plug control module failure: The control module that manages the glow plugs may be malfunctioning.
  4. Corrosion or dirt: Build-up of corrosion or dirt on the glow plug terminals can disrupt the circuit.

Symptoms of P0671 2018 Chevrolet Silverado

  1. Hard starting: Difficulty starting the engine, especially in cold weather conditions.
  2. Rough idling: The engine may run rough or shake at idle.
  3. Decreased fuel efficiency: More fuel may be required to start and run the engine.
  4. Engine misfires: Cylinder 1 may misfire due to the glow plug circuit fault.

How to Fix P0671 2018 Chevrolet Silverado

  1. Diagnose the issue: Use a diagnostic scanner to read the fault codes and pinpoint the problem with the glow plug circuit.
  2. Inspect glow plug: Check the condition of the glow plug in cylinder 1 to see if it needs to be replaced.
  3. Check wiring: Inspect the wiring harness and connections for any damage or loose connections.
  4. Test glow plug control module: Verify the functionality of the glow plug control module to see if it needs to be replaced.
  5. Clear codes and test: After making repairs, clear the fault codes and test the vehicle to ensure the issue has been resolved.

Cost to Fix P0671 2018 Chevrolet Silverado

The cost of repairing a cylinder 1 glow plug circuit fault on a 2018 Chevrolet Silverado can vary depending on the specific cause of the issue and the labor rates in your area. Typically, replacing a glow plug can cost between $50 and $150, while replacing a control module can range from $200 to $500. Labor costs can add up, with rates generally ranging from $80 to $150 per hour. Overall, the total repair cost could range from $200 to $800, including parts and labor. It's advisable to consult with a professional mechanic to get an accurate estimate based on your specific situation.

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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 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P0671 in a 2018 Chevrolet Silverado?

The common symptoms of OBDII code P0671, which indicates a Cylinder 1 Glow Plug Circuit Fault, include hard starting, rough idling, and poor engine performance.

2. What can cause the Cylinder 1 Glow Plug Circuit Fault in a 2018 Chevrolet Silverado?

Possible causes of the Cylinder 1 Glow Plug Circuit Fault (P0671) in a 2018 Chevrolet Silverado include a faulty glow plug, damaged wiring or connectors, or a malfunctioning glow plug control module.

3. How can I diagnose the Cylinder 1 Glow Plug Circuit Fault in my 2018 Chevrolet Silverado?

To diagnose the Cylinder 1 Glow Plug Circuit Fault (P0671), you can use a scan tool to read the OBDII trouble code, visually inspect the glow plug and its wiring, and test the glow plug circuit for continuity and proper voltage.

4. Can I still drive my 2018 Chevrolet Silverado with OBDII code P0671?

It's not recommended to drive your 2018 Chevrolet Silverado with the Cylinder 1 Glow Plug Circuit Fault (P0671) as it can lead to issues like hard starting and engine misfires, potentially causing further damage.

5. How do I repair the Cylinder 1 Glow Plug Circuit Fault in my 2018 Chevrolet Silverado?

To repair the Cylinder 1 Glow Plug Circuit Fault (P0671), you may need to replace the faulty glow plug, repair or replace damaged wiring or connectors, or address any issues with the glow plug control module.

6. Can a DIY enthusiast fix the Cylinder 1 Glow Plug Circuit Fault in a 2018 Chevrolet Silverado?

Depending on your mechanical skills and knowledge, a DIY enthusiast may be able to diagnose and repair the Cylinder 1 Glow Plug Circuit Fault (P0671) in a 2018 Chevrolet Silverado, especially if they have experience with electrical systems.

7. Is it important to address OBDII code P0671 in a timely manner?

Yes, it's important to address OBDII code P0671 promptly to prevent further damage to the engine and ensure optimal performance of your 2018 Chevrolet Silverado.

8. Will resetting the OBDII code P0671 make it go away permanently?

Simply resetting the OBDII code P0671 may clear the warning temporarily, but if the underlying issue causing the Cylinder 1 Glow Plug Circuit Fault is not fixed, the code is likely to return.

9. How much does it typically cost to repair the Cylinder 1 Glow Plug Circuit Fault in a 2018 Chevrolet Silverado?

The cost of repairing the Cylinder 1 Glow Plug Circuit Fault (P0671) in a 2018 Chevrolet Silverado can vary depending on the extent of the issue, parts needed, and labor rates at your chosen repair facility.

10. Can a faulty glow plug cause poor fuel economy in a 2018 Chevrolet Silverado?

Yes, a faulty glow plug contributing to the Cylinder 1 Glow Plug Circuit Fault (P0671) can lead to poor fuel economy in a 2018 Chevrolet Silverado due to incomplete combustion and inefficient engine performance.

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