Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the glow plug in the second cylinder of your engine is not working properly. Glow plugs help start the engine in cold weather.
The P06C6 code is triggered when the Engine Control Module (ECM) detects an issue with the glow plug circuit in cylinder 2. This could mean the glow plug is not heating up as it should.
The glow plug in cylinder 2 is not functioning correctly, which could be due to an electrical fault, a faulty glow plug, or an issue with the wiring or connectors. The ECM monitors the resistance and performance of the glow plug circuit and sets this code when it detects a discrepancy.
• Difficulty starting the engine, especially in cold weather
• Engine misfires
• Increased exhaust smoke
• Faulty glow plug in cylinder 2
• Wiring issues or poor connections
• Faulty glow plug control module
Glow Plug: A device used to heat the air in a diesel engine cylinder to help start the engine.
ECM: Engine Control Module, the computer that controls the engine's operations.
• Inspect the glow plug in cylinder 2 for damage or wear
• Check the wiring and connections to the glow plug
• Test the glow plug control module for faults
• Replace the faulty glow plug
• Repair or replace damaged wiring or connectors
• Replace the glow plug control module if necessary
• Multimeter
• Socket set
• Screwdriver set
$100 - $300
Moderate
• Ford F-250
• Chevrolet Silverado 2500
• Ram 2500
• Regularly inspect glow plugs and replace as needed
• Maintain clean and secure electrical connections
• Use high-quality fuel to prevent deposits
Engine Performance
• Have your vehicle inspected by a professional if you experience starting issues
• Consider replacing all glow plugs if one is faulty to ensure even performance
Check with your vehicle manufacturer to see if glow plugs are covered under warranty.
Glow plug issues are common in diesel engines, especially in colder climates where they are used more frequently.
Moderate – Addressing this issue promptly can prevent further engine starting problems.
Operating a vehicle with faulty glow plugs may lead to increased emissions and starting difficulties.
• Engine cold start
• Ambient temperature below 10°C (50°F)
The glow plug for cylinder 2 is located in the engine cylinder head, typically accessible from the top of the engine.
Q: What happens if I ignore this code?
A: Ignoring this code can lead to starting difficulties and increased emissions, especially in cold weather.
Q: Can I drive with a faulty glow plug?
A: You can drive, but you may experience starting problems and increased emissions. It's best to fix the issue soon.
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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.
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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.
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Fitment Required · Vehicle-fitment part
Commonly relevant for misfire, ignition-efficiency, and some drivability-related repairs.
Misfire and ignition-related faults commonly involve spark plugs as part of the repair path.
Check the correct plug type, gap, and engine application for your vehicle.
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Fitment Required · Vehicle-fitment part
Relevant when the fault points toward ignition-coil performance or cylinder-specific ignition issues.
Some ignition faults involve coil performance or cylinder-specific coil problems.
Match the coil to your engine and confirm the failed component before ordering.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.