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 is having trouble with the little heater in engine cylinder 9. This heater helps the engine start when it's cold.
The P06C1 code indicates an issue with the electrical circuit for the glow plug in cylinder 9. Glow plugs are used to heat the air in diesel engines to help with starting, especially in cold conditions.
The P06C1 code is set when the Engine Control Module (ECM) detects a performance issue or an out-of-range condition in the glow plug circuit for cylinder 9. This could be due to electrical resistance that is too high or low, or a failure in the glow plug itself.
• Difficulty starting the engine, especially in cold weather
• Engine misfires
• Check Engine Light illuminated
• Faulty glow plug in cylinder 9
• Wiring issues in the glow plug circuit
• Faulty glow plug control module
Glow Plug: A device used to heat the air in a diesel engine to aid in starting.
ECM: Engine Control Module, the computer that controls engine functions.
• Perform a visual inspection of the glow plug and wiring for damage.
• Use a multimeter to check the resistance of the glow plug.
• Test the glow plug control module for proper operation.
• Replace the faulty glow plug.
• Repair or replace damaged wiring in the glow plug circuit.
• Replace the glow plug control module if faulty.
• Multimeter
• Socket set
• Diagnostic scanner
$100 - $300
Moderate
• Ford F-250
• Chevrolet Silverado
• Dodge Ram 2500
• Regularly inspect glow plugs and wiring.
• Use high-quality diesel fuel.
• Perform regular engine maintenance.
Engine Performance
• Have the vehicle inspected by a professional mechanic.
• Avoid driving in extremely cold conditions until repaired.
Glow plugs may be covered under the vehicle's powertrain warranty. Check with the manufacturer.
Glow plug issues are common in diesel engines, especially in colder climates where they are used more frequently.
Moderate – This issue can lead to starting problems, especially in cold weather, so it should be addressed promptly.
Driving with a malfunctioning glow plug can lead to increased emissions and potential engine damage.
• Engine at ambient temperature
• Battery fully charged
The glow plug for cylinder 9 is located on the engine block, near the corresponding cylinder.
Q: What happens if I ignore this code?
A: Ignoring this code can lead to starting difficulties and potential engine damage over time.
Q: Can I drive my car with this code?
A: It's possible to drive, but you may experience starting issues, especially in cold weather. It's best to get it fixed soon.
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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.