Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer thinks there's a problem with the special heater for the first cylinder in the engine. This heater helps the engine start when it's cold.
The P06C5 code indicates that the Engine Control Module (ECM) has detected an incorrect operation of the glow plug in cylinder 1.
Glow plugs are used in diesel engines to preheat the combustion chamber, allowing the engine to start more easily in cold conditions. The P06C5 code is triggered when the ECM detects that the glow plug in cylinder 1 is not functioning as expected, which could be due to a malfunctioning glow plug, wiring issues, or a faulty control module.
• Difficulty starting the engine in cold weather
• Engine misfires
• Illuminated check engine light
• Faulty glow plug in cylinder 1
• Damaged or corroded wiring or connectors
• Faulty glow plug control module
Glow Plug: A device used to heat the air in a diesel engine cylinder to aid starting.
ECM: Engine Control Module, the computer that controls engine functions.
• Use an OBD-II scanner to confirm the code.
• Inspect the glow plug and wiring for damage.
• Test the glow plug control module for proper operation.
• Replace the faulty glow plug.
• Repair or replace damaged wiring or connectors.
• Replace the glow plug control module if necessary.
• OBD-II scanner
• Multimeter
• Wrench set
$100 - $300
Moderate
• Ford F-250
• Chevrolet Silverado 2500
• Dodge Ram 2500
• Regularly inspect glow plugs and wiring.
• Perform routine maintenance on the engine.
• Use high-quality fuel to prevent deposits.
Engine Performance
• Have the vehicle inspected by a professional mechanic.
• Avoid driving in extremely cold conditions until repaired.
Check with the vehicle manufacturer for warranty coverage on glow plugs and related components.
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 be difficult to start in cold weather, and prolonged issues can lead to further engine damage.
Driving with a malfunctioning glow plug can lead to increased emissions and potential engine damage.
• Engine cold start
• Ambient temperature below 40°F
The glow plug for cylinder 1 is located in the engine's cylinder head, near the first cylinder.
Q: Can I drive with a P06C5 code?
A: You can drive, but it may be difficult to start the engine in cold weather, and it's best to fix the issue soon.
Q: How do I know if a glow plug is bad?
A: Symptoms include difficulty starting the engine, especially in cold weather, and a rough idle.
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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.