P066D 2014 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 2014 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 2014 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 2014 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 2014 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 2014 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 2014 Chevrolet Silverado Code
What does the OBDII code P066D mean for a 2014 Chevrolet Silverado?
P066D indicates a problem in the cylinder 2 glow plug control circuit, specifically high voltage detected by the engine control module (ECM).
What are the common symptoms of the P066D code in a 2014 Chevrolet Silverado?
Symptoms may include difficulty starting the engine, reduced engine performance, an illuminated check engine light, and rough idling in cold weather.
What causes the P066D code to appear in a 2014 Chevrolet Silverado?
Common causes include a faulty glow plug, damaged wiring or connectors, a malfunctioning glow plug control module, or an ECM issue.
Can I drive my 2014 Chevrolet Silverado with the P066D code?
While the truck may still be drivable, it’s not recommended to ignore the code as it can lead to starting issues, especially in cold weather.
How do I diagnose the P066D code on a 2014 Chevrolet Silverado?
Start by inspecting the glow plug, wiring, and connectors for cylinder 2. Use a multimeter to test circuit voltage and check the glow plug control module for faults.
What tools are needed to diagnose the P066D code?
You’ll need a diagnostic scanner, a multimeter for electrical testing, and possibly a wiring diagram for the glow plug circuit.
Is replacing the glow plug the only solution for the P066D code?
No, replacing the glow plug is one potential fix, but you may also need to repair or replace wiring, connectors, or the glow plug control module.
How much does it cost to repair the P066D code on a 2014 Chevrolet Silverado?
The cost varies depending on the issue. Replacing a glow plug may cost $50–$100, while repairing wiring or replacing the control module could be more expensive.
What happens if the P066D code is not fixed?
If left unresolved, the vehicle may experience starting difficulties, especially in cold weather, and prolonged electrical issues may damage other components.
Can a software update fix the P066D code?
In rare cases, a software update for the ECM may resolve the issue, but this typically applies if the problem is related to incorrect voltage readings rather than hardware faults.
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