P066D 2016 Chevrolet Silverado Code - Cylinder 2 Glow Plug Control Circuit High Voltage
Quick Answer
n the diesel engine, air alone is compressed in the cylinder. Common causes include Faulty cylinder #2 glow plug, Cylinder #2 glow plug harness is open or shorted, Cylinder #2 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
- P066D 2016 Chevrolet Silverado indicates Cylinder 2 Glow Plug Control Circuit High Voltage.
- Common causes
- Common causes include Faulty cylinder #2 glow plug, Cylinder #2 glow plug harness is open or shorted, Cylinder #2 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 P066D 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 P066D 2016 Chevrolet Silverado?
- Faulty cylinder #2 glow plug
- Cylinder #2 glow plug harness is open or shorted
- Cylinder #2 glow plug circuit poor electrical connection
- Faulty Glow Plug Control Module
How to Fix the DTC P066D 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 P066D 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 P066D 2016 Chevrolet Silverado Code
1. What does the OBDII code P066D mean for a 2016 Chevrolet Silverado?
P066D indicates a high voltage issue in the Cylinder 2 Glow Plug Control Circuit, which may affect the engine's ability to start or run smoothly in cold conditions.
2. What are the symptoms of code P066D in a 2016 Chevrolet Silverado?
Symptoms may include difficulty starting the engine in cold weather, poor fuel efficiency, rough idle, or illumination of the check engine light.
3. What causes the P066D code on a 2016 Chevrolet Silverado?
Common causes include a faulty glow plug, damaged glow plug wiring, a malfunctioning glow plug control module, or a short circuit in the electrical system.
4. Can I drive my 2016 Chevrolet Silverado with code P066D?
While the truck may still be drivable, ignoring the code can lead to cold-start issues and reduced engine performance, especially in colder climates.
5. How do I fix the P066D code on a 2016 Chevrolet Silverado?
Repairs typically involve inspecting and replacing the faulty glow plug, repairing damaged wiring, or replacing the glow plug control module if necessary.
6. How do I diagnose the P066D code on my Silverado?
Diagnosis involves using a scan tool to confirm the code, visually inspecting the glow plug and its wiring, testing for proper voltage, and checking the glow plug control module.
7. What is a glow plug and why is it important in diesel engines like the Silverado's?
A glow plug heats the air in the cylinder to aid combustion during cold starts, which is critical for diesel engines to start efficiently in low temperatures.
8. What tools are needed to troubleshoot the P066D code in a 2016 Silverado?
You may need an OBDII scanner, a multimeter to test voltage, and basic tools for accessing and replacing the glow plug or related components.
9. How much does it cost to repair code P066D on a 2016 Chevrolet Silverado?
Repair costs vary but typically range from $100 to $300, depending on whether the glow plug, wiring, or control module needs replacement.
10. Can a bad battery cause the P066D code on a 2016 Silverado?
Yes, a weak or faulty battery can lead to voltage irregularities that may trigger this code, especially in systems relying heavily on electrical components.
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