Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This means that the special heater in the engine that helps start the car when it's cold isn't working right for cylinder number 11.
The P06CF code indicates that the Engine Control Module (ECM) has detected a problem with the glow plug circuit for cylinder 11, which is used to preheat the cylinder for better combustion in cold conditions.
The glow plug for cylinder 11 is not functioning correctly. This could be due to an electrical fault, a bad glow plug, or an issue with the control circuit. The glow plug is essential for starting the engine in cold weather by heating the air in the cylinder to facilitate combustion.
• Difficulty starting the engine in cold weather
• Check Engine Light illuminated
• Rough idle when cold
• Faulty glow plug
• Wiring issues in the glow plug circuit
• Faulty glow plug control module
Glow Plug: A device used to preheat the air in a diesel engine cylinder to aid starting.
ECM: Engine Control Module, the computer that controls engine functions.
• Inspect the glow plug and its wiring for damage.
• Test the glow plug for continuity.
• Check the glow plug control module for faults.
• Replace the faulty glow plug.
• Repair or replace damaged wiring.
• Replace the glow plug control module if necessary.
• Multimeter
• Socket set
• Diagnostic scanner
$100 - $300
Moderate
• Chevrolet Silverado
• GMC Sierra
• Ford F-250
• Regularly inspect glow plugs and wiring.
• Perform scheduled maintenance.
• Use high-quality fuel to prevent deposits.
Engine Performance
• Have the vehicle inspected by a professional if you experience starting issues.
• Avoid driving in extremely cold conditions until the issue is fixed.
Glow plugs may be covered under the vehicle's powertrain warranty. Check with your manufacturer.
Glow plug issues are common in diesel engines, especially in colder climates where they are used frequently.
Moderate – While the vehicle may still run, it can have starting issues in cold weather.
Driving with a faulty glow plug can lead to increased emissions and potential engine damage.
• Engine cold start
• Ambient temperature below 40°F
The glow plug for cylinder 11 is located in the engine's cylinder head, near the fuel injector for cylinder 11.
Q: Can I drive with a P06CF code?
A: You can drive, but you may experience starting issues in cold weather. It's best to fix it soon.
Q: How do glow plugs work?
A: Glow plugs heat the air in diesel engine cylinders to help start the engine in cold conditions.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
View on Amazon
Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.