P0674 2016 Chevrolet Silverado Code - Cylinder 4 Glow Plug Circuit Fault
Quick Answer
The P0674 diagnostic trouble code (DTC) specifically relates to a fault within the cylinder 4 glow plug circuit in a 2016 Chevrolet Silverado. Common causes include Faulty glow plug: The glow plug in cylinder 4 may be defective and unable to heat the combustion chamber effectively, Wiring issues: Damage or corrosion in the wiring harness connecting the glow plug to the ECM can disrupt the circuit, Glow plug relay failure: A malfunctioning glow plug relay can prevent the glow plug in cylinder 4 from receiving power. 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 glow plug: The glow plug in cylinder 4 may be defective and unable to heat the combustion chamber effectively, Wiring issues: Damage or corrosion in the wiring harness connecting the glow plug to the ECM can disrupt the circuit, Glow plug relay failure: A malfunctioning glow plug relay can prevent the glow plug in cylinder 4 from receiving power.
- 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 P0674 2016 Chevrolet Silverado Description
The P0674 diagnostic trouble code (DTC) specifically relates to a fault within the cylinder 4 glow plug circuit in a 2016 Chevrolet Silverado. Glow plugs are essential components in diesel engines that help with cold starting by heating the combustion chamber to facilitate ignition of the fuel-air mixture. When the engine is cold, the glow plug is activated by the engine control module (ECM) to aid in starting the engine.
Common Causes of P0674 2016 Chevrolet Silverado
- Faulty glow plug: The glow plug in cylinder 4 may be defective and unable to heat the combustion chamber effectively.
- Wiring issues: Damage or corrosion in the wiring harness connecting the glow plug to the ECM can disrupt the circuit.
- Glow plug relay failure: A malfunctioning glow plug relay can prevent the glow plug in cylinder 4 from receiving power.
- ECM malfunction: An issue with the engine control module may prevent it from properly activating the glow plug circuit in cylinder 4.
Symptoms of P0674 2016 Chevrolet Silverado
- Hard starting: Difficulty starting the engine, especially in cold weather, can be a common symptom of a faulty glow plug circuit.
- Rough idling: The engine may run rough or unevenly at idle if the glow plug in cylinder 4 is not functioning properly.
- Decreased fuel efficiency: A malfunctioning glow plug can lead to incomplete combustion, resulting in decreased fuel efficiency.
- Check engine light: The illumination of the check engine light on the dashboard could be an indication of a glow plug circuit fault.
- Engine misfires: A faulty glow plug in cylinder 4 may cause misfires, which can lead to reduced engine performance and increased emissions.
How to Fix P0674 2016 Chevrolet Silverado
- Diagnostic scan: Use a diagnostic scan tool to retrieve the fault code and pinpoint the issue with the cylinder 4 glow plug circuit.
- Test glow plug: Check the resistance of the glow plug in cylinder 4 to determine if it is functioning correctly.
- Inspect wiring: Thoroughly inspect the wiring harness for any damage, corrosion, or loose connections that may be affecting the glow plug circuit.
- Check relay: Test the glow plug relay to ensure it is sending power to the glow plug in cylinder 4 as needed.
- Replace components: Replace any faulty glow plugs, damaged wiring, or malfunctioning relay to restore the glow plug circuit's functionality.
Cost to Fix P0674 2016 Chevrolet Silverado
The typical repair costs for a cylinder 4 glow plug circuit fault in a 2016 Chevrolet Silverado can range from $150 to $300, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is advisable to check with local auto repair shops for more precise estimates. Keep in mind that rates may be higher in metropolitan areas or at dealerships, while independent shops may offer lower prices.
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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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