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 part of the fuel injector for cylinder 12 in the engine. It's like a light bulb not getting power, so it can't turn on.
The P315E code indicates an issue with the electrical circuit of the high-pressure fuel injector for cylinder 12. This could be due to a problem with the wiring or the injector itself.
The P315E code is triggered when the Engine Control Module (ECM) detects a malfunction in the electrical circuit of the high-pressure fuel injector for cylinder 12. This could be caused by a short circuit, open circuit, or faulty injector.
• Engine misfire
• Poor fuel economy
• Check Engine Light illuminated
• Faulty fuel injector
• Wiring issues such as short or open circuits
• Faulty ECM
ECM: Engine Control Module
Injector: A device that delivers fuel into the engine's cylinders
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for cylinder 12 injector.
• Test the injector for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the faulty injector.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$200 - $500
Moderate
• BMW 7 Series
• Mercedes-Benz S-Class
• Audi A8
• Regular maintenance and inspections
• Use high-quality fuel
• Avoid driving with low fuel levels
Engine Performance
• Have the vehicle inspected by a professional mechanic.
• Avoid driving the vehicle until the issue is resolved to prevent further damage.
Check with the vehicle manufacturer for 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 prevent further engine damage.
Driving with a faulty injector can lead to increased emissions and potential engine damage.
• Engine at operating temperature
• Vehicle in park or neutral
The injector for cylinder 12 is located on the engine block, typically on the passenger side in a V12 engine configuration.
Q: Can I drive with a P315E code?
A: It's not recommended to drive with this code as it can lead to engine damage and poor performance.
Q: How do I clear a P315E code?
A: You can clear the code with an OBD-II scanner after addressing the underlying issue.
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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.