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 computer in your car has detected a problem with the part that helps warm up the engine in cold weather, specifically for the eighth cylinder. It's like when you try to turn on a heater and it doesn't work because the power is too low.
The P068E code indicates that there is an issue with the electrical circuit controlling the glow plug for cylinder 8. The voltage is lower than expected, which can affect the glow plug's ability to function properly.
The glow plug control circuit for cylinder 8 is responsible for providing the necessary voltage to the glow plug so that it can heat up and facilitate combustion in the cylinder, especially in cold conditions. A low circuit condition means the voltage is insufficient, which could be due to wiring issues, a faulty glow plug, or a problem with the control module.
• Difficulty starting the engine 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 used to heat the air in a diesel engine cylinder to help ignite the fuel.
Control Circuit: The electrical pathway that controls a component's operation.
• Use a scan tool to verify the code
• Inspect the wiring and connectors for damage
• Test the glow plug for proper resistance
• Replace the faulty glow plug
• Repair or replace damaged wiring/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 electrical system
• Use high-quality replacement parts
Sensor Issue
• Have the vehicle inspected by a professional if you're unsure
• Avoid driving in extremely cold conditions until fixed
Check with your vehicle manufacturer; glow plugs may be covered under powertrain warranty.
Glow plug circuit issues are common in diesel engines, especially in colder climates where they are used more frequently.
Moderate – While the vehicle may still operate, it can lead to starting issues and should be addressed to prevent further damage.
Driving with a malfunctioning glow plug circuit can lead to increased emissions and may not comply with local regulations.
• Engine off and cool
• Battery fully charged
The glow plug for cylinder 8 is located on the engine block, typically near the top of the cylinder head.
Q: What happens if I ignore this code?
A: Ignoring this code can lead to starting issues, especially in cold weather, and may cause further engine damage over time.
Q: Can I drive my car with this code?
A: You can drive the car, but it may be difficult to start in cold weather, and it's best to address the issue as soon as possible.
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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.