Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
There's a problem with the fuel injector for cylinder 10 in the engine. It's like a light bulb that isn't working right because of a wiring issue.
This code indicates an electrical issue with the fuel injector for cylinder 10. The problem is with the electrical circuit that controls the injector.
The P314D code is triggered when the Engine Control Module (ECM) detects a short circuit or high resistance in the low side of the high-pressure fuel injector circuit for cylinder 10. This can affect the injector's ability to deliver the correct amount of fuel to the cylinder.
• Check Engine Light is on
• Engine misfires
• Poor fuel economy
• Faulty fuel injector
• Damaged wiring or connectors
• Faulty ECM
ECM: Engine Control Module, the computer that controls engine functions.
Injector: A device that sprays fuel into the engine's cylinders.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for cylinder 10 injector.
• Test the injector for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the faulty fuel injector.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Fuel injector tester
$150 - $500
Moderate
• BMW 7 Series
• Audi A8
• Mercedes-Benz S-Class
• Regular maintenance checks
• Ensure proper fuel quality
• Inspect wiring harnesses periodically
Engine Performance
• Avoid driving the vehicle until repaired to prevent further damage.
• Consult a professional mechanic for diagnosis and repair.
Check if the vehicle's powertrain warranty covers injector issues.
This code has been associated with high-performance engines that use direct fuel injection systems.
Moderate – It should be addressed soon to prevent engine damage.
Driving with a malfunctioning injector can lead to increased emissions and potential engine damage.
• Engine at operating temperature
• Vehicle in a controlled environment
The fuel injector for cylinder 10 is located on the engine block, typically under the intake manifold.
Q: Can I drive with a P314D code?
A: It's not recommended as it can cause engine damage and worsen fuel economy.
Q: How do I reset the P314D code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue is fixed, it should not return.
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Network faults often require full-system access instead of a generic code reader alone.
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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.