Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
Your car has a problem with the electrical part of the fuel injector for cylinder 11. It's like a light bulb that isn't getting the right power to turn on.
This code indicates an issue with the electrical circuit of the high-pressure fuel injector for cylinder 11, either on the low side or high side.
The P315B code is triggered when the Engine Control Module (ECM) detects a problem with the electrical circuit of the high-pressure fuel injector for cylinder 11. This could be due to an open circuit, a short to ground, or a short to voltage in the injector's electrical circuit.
• Check Engine Light is on
• Engine misfire
• Poor fuel economy
• Faulty fuel injector
• Wiring issues in the injector circuit
• Faulty ECM
ECM: Engine Control Module
Injector: A device that sprays fuel into the engine's cylinders
• Use a scan tool to verify the code and check for any other related codes.
• Inspect the wiring and connectors for the injector of cylinder 11.
• Test the injector's electrical resistance and operation.
• Repair or replace damaged wiring or connectors.
• Replace the faulty injector.
• Reprogram or replace the ECM if necessary.
• OBD-II scan tool
• Multimeter
• Basic hand tools
$200 - $600
Moderate
• BMW 7 Series
• Mercedes-Benz S-Class
• Audi A8
• Regular maintenance and inspection of the fuel system.
• Use high-quality fuel to prevent injector clogging.
• Keep the electrical system in good condition.
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 commonly seen in high-performance engines where precise fuel delivery is critical.
Moderate – Should be addressed soon to avoid engine performance issues.
Driving with this code may lead to increased emissions and potential damage to the catalytic converter.
• Engine at operating temperature
• Vehicle in a safe location
The high-pressure fuel injector for cylinder 11 is located on the engine, typically under the intake manifold.
Q: Can I drive with a P315B code?
A: It's not recommended to drive with this code as it can cause further engine damage.
Q: How can I prevent this code from appearing?
A: Regular maintenance and using quality fuel can help prevent injector issues.
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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.