Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there is a problem with the special heater (glow plug) in cylinder 10 of your diesel engine. It's not getting enough power to work properly.
The P069C code indicates that the glow plug control circuit for cylinder 10 is experiencing low voltage, suggesting a problem with the electrical supply to the glow plug.
The glow plug is a heating device used to aid the starting of diesel engines. The control circuit for cylinder 10's glow plug is not receiving the correct voltage, which can prevent the glow plug from heating properly. This can affect engine starting and performance, especially in cold conditions.
• Difficulty starting the engine, especially in cold weather
• Engine misfires
• Check engine light illuminated
• Faulty glow plug
• Damaged wiring or connectors
• Faulty glow plug control module
Glow Plug: A device that heats the air in a diesel engine's cylinder to aid in starting.
Control Module: An electronic device that manages the operation of the glow plugs.
• Check the glow plug for cylinder 10 for continuity.
• Inspect wiring and connectors for damage or corrosion.
• 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 faulty.
• Multimeter
• Socket set
• Diagnostic scanner
$100 - $300
Moderate
• Ford F-Series
• Chevrolet Silverado
• Ram 2500
• Regularly inspect glow plugs and wiring.
• Ensure proper maintenance of the glow plug control module.
• Use high-quality diesel fuel to prevent carbon buildup.
Sensor Issue
• Have the vehicle inspected by a professional if the check engine light is on.
• Avoid prolonged engine cranking to prevent battery drain.
• Consider having a block heater installed for cold climates.
Glow plugs and related components may be covered under the vehicle's powertrain warranty. Check with your dealer for specific coverage.
Glow plug issues are common in diesel engines, especially in colder climates. Regular maintenance can prevent most related problems.
Moderate – While the vehicle may still operate, starting problems can worsen, especially in cold weather.
Driving with a faulty glow plug can lead to increased emissions and may affect vehicle safety in cold weather.
• Engine at normal operating temperature
• Ambient temperature below freezing
The glow plug for cylinder 10 is located on the engine block, typically near the top of the cylinder head.
Q: What is a glow plug?
A: A glow plug is a heating device used to aid the starting of diesel engines by warming the air in the cylinders.
Q: Can I drive with a P069C code?
A: You can drive with this code, but it may lead to starting issues, especially in cold weather. It's best to have it checked soon.
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Universal · Digital multimeter
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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.