P0671 2017 GMC Sierra 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 2017 GMC Sierra 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.
Code P0671 2017 GMC Sierra Description
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.
What are the Possible Causes of the DTC P0671 2017 GMC Sierra?
- 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 2017 GMC Sierra?
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 2017 GMC Sierra 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.
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Frequently Asked Questions about P0671 2017 GMC Sierra Code
What does the OBDII code P0671 mean on a 2017 GMC Sierra?
The P0671 code indicates a fault in the glow plug circuit for cylinder 1, which may prevent proper engine starting in cold conditions.
What are the symptoms of code P0671 in a 2017 GMC Sierra?
Symptoms may include difficulty starting the engine in cold weather, poor engine performance, and an illuminated Check Engine Light.
What causes the P0671 code on a 2017 GMC Sierra?
Common causes include a faulty glow plug, damaged wiring or connectors in the glow plug circuit, or a malfunctioning glow plug control module.
Can I still drive my 2017 GMC Sierra with a P0671 code?
Yes, but it’s not recommended for extended periods, especially in cold weather, as it could lead to starting issues and potential damage to the engine.
How do you diagnose the P0671 code on a 2017 GMC Sierra?
Diagnosis typically involves inspecting the glow plug, wiring, and connectors for damage, testing the glow plug’s resistance, and checking the glow plug control module.
How do you fix a P0671 code on a 2017 GMC Sierra?
Repairs may include replacing the faulty glow plug, repairing damaged wiring or connectors, or replacing the glow plug control module if it’s defective.
What tools are needed to diagnose and repair the P0671 code?
You’ll need a multimeter to test electrical components, a scan tool to read and clear codes, and basic hand tools for replacing parts.
How much does it cost to fix a P0671 code on a 2017 GMC Sierra?
The cost depends on the cause, but replacing a single glow plug typically costs $100-$200, including parts and labor.
Can a bad glow plug damage the engine of a 2017 GMC Sierra?
While a single bad glow plug won’t immediately damage the engine, prolonged issues can lead to cold-start problems and increased wear on other components.
How can I prevent the P0671 code from recurring?
Regular maintenance, such as inspecting glow plugs and electrical connections, can help prevent this code from returning.
Discuss the causes and fixes for P0671 2017 GMC Sierra OBDII Code
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