P066B 2016 Chevrolet Silverado Code - Cylinder 1 Glow Plug Control Circuit High Voltage
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
- P066B 2016 Chevrolet Silverado indicates Cylinder 1 Glow Plug Control Circuit High Voltage.
- 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 P066B 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 P066B 2016 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
How to Fix the DTC P066B 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 P066B 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 P066B 2016 Chevrolet Silverado Code
1. What does the OBDII code P066B mean on a 2016 Chevrolet Silverado?
P066B indicates a high voltage issue in the Cylinder 1 Glow Plug Control Circuit, which means the system has detected an electrical fault related to the glow plug for cylinder 1.
2. What are the common symptoms of the P066B code?
Symptoms may include difficulty starting the engine in cold weather, reduced engine performance, a flashing or steady check engine light, and possibly increased exhaust smoke on startup.
3. What causes the P066B code to appear?
The most common causes include a faulty glow plug, damaged or corroded wiring in the glow plug circuit, a defective glow plug control module, or electrical issues such as loose connections.
4. Can I still drive my 2016 Chevrolet Silverado with the P066B code?
While the truck may still be drivable, ignoring the issue can result in harder cold starts, increased emissions, and potential damage to other components. It’s best to address the problem promptly.
5. How can I diagnose the P066B code?
Start by inspecting the glow plug for cylinder 1, checking for damage or wear. Next, examine the wiring and connectors in the glow plug circuit for corrosion or loose connections. Use a multimeter to test voltage and resistance.
6. How do I fix the P066B code on a 2016 Chevrolet Silverado?
Repairs may involve replacing the faulty glow plug, repairing or replacing damaged wiring or connectors, or replacing the glow plug control module if it’s defective.
7. How much does it cost to repair the P066B code?
Repair costs can vary but typically include the price of a glow plug ($20-$60 each) and labor, which may range from $100-$200 depending on the shop and location. Wiring or module repairs may increase costs.
8. Can a weak battery cause the P066B code?
Yes, a weak or failing battery can lead to voltage irregularities that trigger the P066B code. Ensure the battery is in good condition and fully charged before further diagnostics.
9. Does the P066B code affect fuel efficiency?
Yes, the faulty glow plug system can lead to inefficient combustion, especially during cold starts, which may slightly reduce fuel efficiency.
10. Do I need special tools to fix the P066B code?
Basic tools like a multimeter and socket set are often sufficient for diagnosing and replacing glow plugs. For more advanced repairs, like control module replacement, specialized tools or professional assistance may be required.
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