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's a problem with the electrical connection to one of the fuel injectors in the engine. It's like a broken wire that stops the fuel from getting to where it needs to go.
The P3108 code indicates an open circuit in the low side of the high-pressure injector for cylinder 3, meaning there's a break or disconnection in the electrical pathway.
The P3108 code is triggered when the Engine Control Module (ECM) detects an open circuit in the low side of the high-pressure injector for cylinder 3. This can result in improper fuel delivery to the cylinder, affecting engine performance.
• Engine misfire
• Reduced engine performance
• Check Engine Light illuminated
• Faulty injector
• Broken or damaged wiring
• Poor electrical connection
Injector: A device that sprays fuel into the engine's cylinders.
ECM: Engine Control Module, the computer that controls engine functions.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage.
• Test the injector for proper operation.
• Repair or replace damaged wiring.
• Replace the faulty injector.
• Ensure all connections are secure.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• Toyota Camry
• Honda Accord
• Ford F-150
• Regularly inspect and maintain wiring harnesses.
• Ensure connectors are clean and secure.
• Use fuel system cleaners periodically.
Engine Performance
• Have the vehicle inspected by a professional.
• Avoid driving the vehicle excessively until repaired.
Check with the vehicle manufacturer for specific warranty coverage on fuel injectors and related components.
This code is often associated with vehicles that have high mileage or have been exposed to harsh conditions.
Moderate – It should be addressed soon to prevent further engine damage.
Driving with an engine misfire can cause damage to the catalytic converter and increase emissions.
• Engine running
• Warm engine temperature
The injector for cylinder 3 is located on the engine, typically accessible by removing the engine cover.
Q: Can I drive with a P3108 code?
A: It's not recommended as it can lead to further engine damage and increased emissions.
Q: How do I know if my injector is faulty?
A: Symptoms include engine misfires, poor performance, and a check engine light. A professional diagnosis is recommended.
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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.