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 11 in the engine. It's like a tiny water gun that sprays fuel into the engine, and right now, it's not working properly because of an electrical issue.
The code indicates an electrical fault in the fuel injector circuit for cylinder 11. This could be due to a short circuit or high resistance in the wiring.
P315A is triggered when the Engine Control Module (ECM) detects an abnormal electrical reading in the low side circuit of the high-pressure fuel injector for cylinder 11. This could be due to a short between the windings of the injector coil or an open/high resistance in the circuit.
• Engine misfire
• Reduced engine performance
• Check Engine Light illuminated
• Short circuit in the injector wiring
• Faulty fuel injector
• Corroded or damaged connector
ECM: Engine Control Module, the computer that manages engine functions.
Injector: A device that sprays fuel into the engine's combustion chamber.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for cylinder 11 injector.
• Test the resistance of the injector coil.
• Repair or replace damaged wiring.
• Replace the faulty injector.
• Clean and secure electrical connectors.
• OBD-II scanner
• Multimeter
• Basic hand tools
$200 - $600
Moderate
• BMW 7 Series
• Mercedes-Benz S-Class
• Audi A8
• Regularly inspect and maintain the fuel system.
• Ensure electrical connections are secure.
• Use quality fuel to prevent injector clogging.
Engine Performance
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional mechanic.
• Avoid driving the vehicle hard until repaired.
Check with the vehicle manufacturer for potential warranty coverage on fuel injectors.
This code is more common in high-performance vehicles with direct fuel injection systems.
Moderate – Should be addressed soon to avoid potential engine damage.
Driving with a misfiring engine can lead to increased emissions and potential engine damage.
• Engine running
• Warm engine temperature
Cylinder 11 injector is located on the engine block, typically under the intake manifold.
Q: Can I drive with a P315A 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: After repairs, use an OBD-II scanner to clear the code. If the issue is fixed, the light should stay off.
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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.