P066B 2018 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 2018 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 2018 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 2018 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 2018 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 2018 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 2018 Chevrolet Silverado Code
1. What does the OBDII code P066B mean for a 2018 Chevrolet Silverado?
P066B indicates a high voltage condition in the Cylinder 1 Glow Plug Control Circuit, which controls the heating element for the cylinder 1 glow plug in diesel engines.
2. What are common symptoms of the P066B code on a 2018 Chevrolet Silverado?
Symptoms may include difficulty starting the engine in cold weather, rough idling, reduced fuel efficiency, and an illuminated check engine light.
3. What causes the P066B code to trigger in a Chevrolet Silverado?
Common causes include a faulty glow plug, damaged wiring or connectors in the glow plug circuit, a malfunctioning glow plug control module, or a short circuit.
4. How do I diagnose the P066B code on my 2018 Chevrolet Silverado?
Start by checking the glow plug and its wiring for damage or corrosion. Use a multimeter to test the glow plug resistance and inspect the control module for faults.
5. Can I drive my 2018 Chevrolet Silverado with the P066B code?
While the vehicle may still run, driving with this code can cause starting difficulties in cold weather and may lead to further damage to the glow plug system.
6. How do I fix the P066B code on a 2018 Chevrolet Silverado?
Repairs may include replacing the faulty glow plug, repairing damaged wiring or connectors, or replacing the glow plug control module if it’s defective.
7. How much does it cost to fix the P066B code on a Chevrolet Silverado?
The repair cost depends on the issue, ranging from $50 to $200 for a glow plug replacement to $300 or more for a glow plug control module replacement.
8. Can a weak battery cause the P066B code in my Silverado?
Yes, a weak or failing battery can lead to voltage irregularities, which may trigger the P066B code.
9. Do I need special tools to repair the P066B code on a 2018 Silverado?
You may need a multimeter to test electrical components and possibly an OBDII scanner to clear the code after repairs.
10. Will clearing the P066B code fix the problem on my Chevrolet Silverado?
Clearing the code will temporarily turn off the check engine light, but the issue will likely return unless the underlying problem is resolved.
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