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 fuel injector for cylinder 9 in the engine. It's like a tiny valve that sprays fuel, and the wires that tell it when to open and close aren't working right.
The P314C code indicates an issue with the electrical circuit that controls the high-pressure fuel injector for cylinder 9. The circuit is open, meaning there's a break or disconnection preventing proper operation.
The P314C code is triggered when the Engine Control Module (ECM) detects an open circuit in the high-pressure injector's low side or high side for cylinder 9. This can result in improper fuel delivery and engine performance issues.
• Engine misfire
• Reduced engine performance
• Check Engine Light illuminated
• Faulty fuel injector
• Damaged wiring or connectors
• ECM malfunction
ECM: Engine Control Module
Injector: A device that sprays fuel into the engine's cylinders
• Inspect the fuel injector wiring and connectors for damage.
• Test the fuel injector with a multimeter for proper resistance.
• Check the ECM for any faults or malfunctions.
• Replace or repair damaged wiring or connectors.
• Replace the faulty fuel injector.
• Reprogram or replace the ECM if necessary.
• Multimeter
• OBD-II scanner
• Basic hand tools
$200 - $600
Moderate
• BMW 7 Series
• Audi A8
• Mercedes-Benz S-Class
• Regular maintenance checks
• Ensure proper fuel quality
• Inspect wiring regularly
Engine Performance
• Do not ignore the Check Engine Light.
• Seek professional diagnosis if unsure.
• Avoid driving long distances until fixed.
Check vehicle warranty for coverage on fuel system components.
This code has been associated with high-performance engines that utilize direct fuel injection systems.
Moderate – Addressing this issue promptly can prevent further engine damage.
Driving with a misfiring engine can lead to increased emissions and potential damage to the catalytic converter.
• Engine at operating temperature
• Vehicle stationary
The high-pressure fuel injector for cylinder 9 is located on the engine block, typically under the intake manifold.
Q: Can I drive my car with this code?
A: It's not recommended to drive for long periods with this code as it can lead to engine damage.
Q: How can I reset the Check Engine Light?
A: You can use an OBD-II scanner to reset the light, but it's important to fix the underlying issue first.
High-End · Full-system diagnostics
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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.