P0674 2016 Chevrolet Silverado Code - Cylinder 4 Glow Plug Circuit Fault
Quick Answer
n the diesel engine, air alone is compressed in the cylinder. Common causes include Faulty cylinder #4 glow plug, Cylinder #4 glow plug harness is open or shorted, Cylinder #4 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
- P0674 2016 Chevrolet Silverado indicates Cylinder 4 Glow Plug Circuit Fault.
- Common causes
- Common causes include Faulty cylinder #4 glow plug, Cylinder #4 glow plug harness is open or shorted, Cylinder #4 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 P0674 2016 Chevrolet Silverado 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 P0674 2016 Chevrolet Silverado?
- Faulty cylinder #4 glow plug
- Cylinder #4 glow plug harness is open or shorted
- Cylinder #4 glow plug circuit poor electrical connection
- Faulty Glow Plug Control Module (GPCM)
How to Fix the DTC P0674 2016 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 P0674 2016 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.
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Frequently Asked Questions about P0674 2016 Chevrolet Silverado Code
1. What does the P0674 code mean on a 2016 Chevrolet Silverado?
The P0674 code indicates a Cylinder 4 Glow Plug Circuit Fault, meaning the glow plug or its circuit for cylinder 4 is not functioning properly.
2. What are the common symptoms of the P0674 code?
Symptoms include difficulty starting the engine in cold weather, rough idling, reduced fuel efficiency, and the check engine light being illuminated.
3. What causes the P0674 code to appear?
Common causes include a faulty glow plug, damaged wiring or connectors in the glow plug circuit, a malfunctioning glow plug control module, or corrosion in the electrical connections.
4. How do I diagnose the P0674 code?
Diagnosis involves inspecting the glow plug, checking for damaged or corroded wiring, testing the glow plug resistance with a multimeter, and verifying the operation of the glow plug control module.
5. Can I drive my 2016 Chevrolet Silverado with a P0674 code?
While the truck may still run, driving with this code can lead to hard starts, especially in cold weather, and may cause additional stress on the engine.
6. How do I fix the P0674 code?
Repairs may include replacing the faulty glow plug, repairing damaged wiring or connectors, cleaning corroded electrical connections, or replacing the glow plug control module if necessary.
7. How much does it cost to repair a P0674 code?
The cost can vary, but replacing a single glow plug typically costs between $100 and $200, including parts and labor. Additional repairs, such as fixing wiring, may increase the cost.
8. Can a bad glow plug cause other engine problems?
Yes, a bad glow plug can lead to poor cold starts, increased emissions, and potentially rough engine operation if not addressed.
9. How can I prevent the P0674 code from occurring again?
Regularly inspect and maintain the glow plug system, address electrical issues promptly, and replace glow plugs as recommended by the manufacturer.
10. Is the P0674 code specific to cylinder 4?
Yes, the P0674 code specifically refers to a fault in the glow plug circuit for cylinder 4 on your 2016 Chevrolet Silverado.
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