AutoCodes – Chevrolet – P0671 2018 Chevrolet Silverado

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

Quick Answer

n the diesel engine, air alone is compressed in the cylinder. 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 2018 Chevrolet Silverado 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 873

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Mar 24, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0671 2018 Chevrolet Silverado Description

n the diesel engine, air alone is compressed in the cylinder. Then, after the air has been compressed, a charge of fuel is sprayed into the cylinder and ignition occurs, due to the heat of compression. Eight glow plugs are used as an aid to starting.
Control of the glow plugs is accomplished by the Glow Plug Control Module. The nominal voltage for the glow plugs is 5.4 volts. When the ignition is turned On, the Glow Plug Control Module applies 7.2 V for 2.2 s, then 5.7 V for 0.8 s, and then 5.4 V until 1200°C (2192°F) is reached. The maximum voltage of the system is 10 V. While the engine is running the voltage will vary between 4.7 - 10 V when in closed loop control to maintain a glow plug temperature that ranges from 1150° - 1180°C (2102° - 2156°F). The temperature and the power consumption are controlled between the Engine Control Module (ECM) and the Glow Plug Control Module within a wide range to suit the engine's pre-heating requirements. Each glow plug is energized individually. This capability yields more optimum heat times for the glow plugs, thus pre - glow times can be kept to a minimum for a short wait to crank times and maximum glow plug durability.

OBDII Code P0671 2018 Chevrolet Silverado - Cylinder 1 Glow Plug Circuit Fault - AutoCodes.com — P0671 2018 Chevrolet Silverado Code - Cylinder 1 Glow Plug Circuit Fault

What does this mean?

What are the Possible Causes of the DTC P0671 2018 Chevrolet Silverado?

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 Control Module (GPCM)

How to Fix the DTC P0671 2018 Chevrolet Silverado?

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0671 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado code?

Need more information on how to fix the P0671 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0671 2018 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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.