P066A 2016 Chevrolet Silverado Code - Cylinder 1 Glow Plug Control Circuit Low 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
- P066A 2016 Chevrolet Silverado indicates Cylinder 1 Glow Plug Control Circuit Low 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 P066A 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 P066A 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 P066A 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 P066A 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 P066A 2016 Chevrolet Silverado Code
What does the OBDII code P066A mean for a 2016 Chevrolet Silverado?
P066A indicates a low voltage issue in the cylinder 1 glow plug control circuit, which is part of the diesel engine's starting system.
What are the symptoms of the P066A code on a 2016 Chevrolet Silverado?
Symptoms may include difficulty starting the engine in cold weather, reduced fuel efficiency, and the check engine light turning on.
What causes the P066A code to appear?
Common causes include a faulty glow plug, damaged wiring or connectors in the glow plug circuit, or a malfunctioning glow plug control module.
Can driving with the P066A code damage my Silverado?
While the truck may still operate, driving with this code could lead to poor performance in cold conditions and potentially damage the glow plug system over time.
How do I diagnose the P066A code on my 2016 Silverado?
Start by inspecting the glow plug and its wiring for damage, then test the glow plug control module and related connections using a multimeter.
How much does it cost to repair the P066A code?
Repair costs can vary, but replacing a glow plug typically costs around $100-$200, while fixing wiring or replacing the control module may cost more depending on labor rates.
Can I fix the P066A code myself?
If you have mechanical experience, you can check for damaged wiring or replace the glow plug. However, advanced diagnostics may require professional tools and expertise.
What tools do I need to repair the P066A code on a Silverado?
You may need a multimeter, basic hand tools, and possibly a scan tool to clear the code after repairs are completed.
Do I need to replace all glow plugs if one fails?
No, you only need to replace the faulty glow plug, but it's often recommended to check all glow plugs for wear at the same time.
Can a faulty battery cause the P066A code?
Yes, a weak battery can cause low voltage issues in the glow plug circuit, so testing the battery is a good first step in diagnosis.
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