P0671 2014 GMC Sierra Code - Cylinder 1 Glow Plug Circuit Fault
Quick Answer
In 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 2014 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 2014 GMC Sierra Description
Control of the glow plugs is accomplished by the Glow Plug Control Module. For the glow plugs, the nominal voltage is 5.4 volts. When the ignition is turned on, the Glow Plug Control Module applies 7.2 volts for 2.2 seconds, then 5.7 volts for 0.8 seconds, and then 5.4 volts until 1200°C (2192°F) is reached. The maximum voltage of the system is 10 volts.
While the engine is running, the voltage will vary between 4.7 and 10 volts when in closed-loop control to maintain a glow plug temperature that ranges from 1150° to 1180°C (2102° to 2156°F). The temperature and 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, resulting in a short wait for crank times and maximizing glow plug durability.
What are the Possible Causes of the DTC P0671 2014 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 2014 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 2014 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 2014 GMC Sierra Code
What does the OBDII code P0671 mean on a 2014 GMC Sierra?
Code P0671 indicates a fault in the glow plug circuit for cylinder 1, which is responsible for heating the cylinder for proper combustion in cold conditions.
What are common symptoms of P0671 in a 2014 GMC Sierra?
Symptoms can include difficulty starting the engine in cold weather, rough idle, reduced fuel efficiency, and the check engine light being illuminated.
What causes P0671 in a 2014 GMC Sierra?
Common causes include a faulty glow plug, damaged glow plug wiring or connectors, a failed glow plug control module, or corrosion in the circuit.
How can I diagnose the P0671 code on my 2014 GMC Sierra?
Start by inspecting the glow plug for cylinder 1, checking the wiring and connectors for damage or corrosion, and testing the glow plug control module for proper operation.
Can I drive my 2014 GMC Sierra with the P0671 code?
While driving with P0671 is possible, it may lead to starting issues and reduced engine performance, especially in cold weather. Prompt repair is recommended.
How do I fix the P0671 code on a 2014 GMC Sierra?
Repairs can include replacing the faulty glow plug, repairing or replacing damaged wiring, cleaning corroded connections, or replacing the glow plug control module if defective.
How much does it cost to fix the P0671 code on a 2014 GMC Sierra?
The cost can vary depending on the exact issue. Glow plug replacement typically costs $50-$150 per plug, while glow plug control module replacement can range from $300-$600.
Can a faulty glow plug cause other issues in my 2014 GMC Sierra?
Yes, a faulty glow plug may lead to increased emissions, poor engine performance, and difficulty starting, especially in colder climates.
What tools are needed to fix P0671 on a 2014 GMC Sierra?
You may need a multimeter to test electrical components, basic hand tools for removing and replacing parts, and possibly a diagnostic scanner to clear the code after repairs.
How can I prevent the P0671 code from recurring in my 2014 GMC Sierra?
Regular maintenance, including inspecting glow plugs and wiring for corrosion or damage, and using high-quality replacement parts can help prevent recurring issues.
Discuss the causes and fixes for P0671 2014 GMC Sierra OBDII Code
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