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 something is wrong with the part of the engine that helps spray fuel into cylinder number 11. It's like when a water gun's trigger is stuck, and it can't spray water properly.
The code P315C indicates an issue with the electrical circuit that controls the high-pressure fuel injector for cylinder 11. The circuit is either open or not functioning correctly.
P315C 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 11. This can affect the injector's ability to deliver the correct amount of fuel to the cylinder, impacting engine performance.
• Engine misfire
• Reduced engine performance
• Check Engine Light illuminated
• Faulty high-pressure fuel injector
• Damaged or corroded wiring or connectors
• Faulty Engine Control Module (ECM)
Injector: A device that sprays fuel into the engine's cylinders.
ECM: Engine Control Module, the computer that controls engine functions.
• Perform a visual inspection of the injector wiring and connectors.
• Use a multimeter to check for continuity in the injector circuit.
• Test the injector for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the faulty injector.
• Reprogram or replace the ECM if necessary.
• Multimeter
• OBD-II scanner
• Basic hand tools
$200 - $800
Moderate
• BMW 7 Series
• Audi A8
• Mercedes-Benz S-Class
• Regular maintenance and inspection of fuel injectors.
• Ensure proper electrical connections.
• Use quality fuel to prevent injector clogging.
Engine Performance
• Avoid driving the vehicle until repairs are made to prevent further damage.
• Consult a professional mechanic for accurate diagnosis and repair.
Repairs may be covered under manufacturer warranty if the vehicle is still within the warranty period.
This code is relatively uncommon and typically associated with high-performance engines with direct fuel injection systems.
High – This issue can lead to significant engine performance problems if not addressed promptly.
Ignoring this code can lead to increased emissions and potential engine damage, which may not comply with emissions regulations.
• Engine at operating temperature
• Vehicle in park or neutral
The high-pressure injector for cylinder 11 is located on the engine block, typically near the intake manifold.
Q: Can I drive with a P315C code?
A: It's not recommended to drive with this code as it can lead to engine performance issues and potential damage.
Q: How do I clear a P315C code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue is resolved, the code should not return.
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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.