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 special heater (glow plug) for cylinder number 10 in the engine isn't working properly. It's like when a light bulb is burned out and doesn't turn on.
The P0680 code indicates that the engine control module (ECM) has detected an open circuit or malfunction in the glow plug circuit for cylinder 10.
Glow plugs are used in diesel engines to preheat the air in the cylinders to ensure efficient combustion, especially in cold weather. The P0680 code is triggered when the ECM detects an open circuit or malfunction in the glow plug circuit for cylinder 10, which can affect engine starting and performance.
• Difficulty starting the engine, especially in cold weather
• Engine misfires
• Illuminated check engine light
• Faulty glow plug in cylinder 10
• Damaged or corroded glow plug wiring or connector
• Faulty glow plug control module
Glow Plug: A device used in diesel engines to preheat the air in the cylinders to ensure efficient combustion.
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 cylinder 10 for damage or corrosion.
• Test the glow plug for proper resistance.
• Replace the faulty glow plug in cylinder 10.
• Repair or replace damaged wiring or connectors.
• Replace the glow plug control module if necessary.
• OBD-II scanner
• Multimeter
• Socket set
$100 - $300
Moderate
• Ford F-250
• Chevrolet Silverado
• RAM 2500
• Regularly inspect glow plugs and wiring.
• Ensure proper maintenance of the glow plug control system.
• Use quality fuel to prevent deposits.
Engine Performance
• If you experience hard starting, have the vehicle inspected.
• Regular maintenance can prevent glow plug issues.
Check with your vehicle manufacturer for warranty coverage on engine components.
Glow plug circuit issues are common in diesel engines, especially in older models or those with high mileage.
Moderate – Addressing this issue promptly can prevent starting problems and improve engine performance.
Driving with a malfunctioning glow plug circuit can lead to increased emissions and potential engine damage.
• Engine cold start
• Normal operating conditions
The glow plug for cylinder 10 is located in the engine's cylinder head, near the fuel injector for that cylinder.
Q: Can I drive with a P0680 code?
A: While you may be able to drive, it's best to fix the issue to avoid starting problems and potential engine damage.
Q: How do I know if a glow plug is bad?
A: Symptoms include hard starting, engine misfires, and a check engine light. Testing the glow plug's resistance can confirm a fault.
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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.