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 isn't right with the electrical circuit that controls the fuel injector for cylinder number 6 in the car's engine. It's like a broken wire or a switch that isn't working, so the car might not run smoothly.
The engine control module (ECM) has detected an open circuit in the high pressure injector circuit for cylinder 6.
The P312F code indicates that there is an open circuit in the electrical system that controls the high pressure fuel injector for cylinder 6. This could mean a break in the wiring or a faulty connection, preventing the injector from receiving the necessary signals to operate correctly.
• Engine misfire or rough running
• Decreased fuel efficiency
• Check Engine Light illuminated
• Broken or damaged wiring in the injector circuit
• Faulty injector for cylinder 6
• Poor electrical connection at the injector or ECM
Injector: A device that sprays fuel into the engine's cylinders.
ECM: Engine Control Module, the computer that controls engine functions.
• Check the wiring and connectors for cylinder 6 injector
• Test the injector for proper operation
• Inspect the ECM for any faults
• Repair or replace damaged wiring
• Replace the faulty injector
• Ensure all electrical connections are secure
• Multimeter
• OBD-II scanner
• Basic hand tools
$150 - $500
Moderate
• BMW 3 Series
• BMW 5 Series
• BMW X5
• Regularly inspect wiring and connectors
• Perform routine maintenance
• Use quality fuel to prevent injector clogging
Engine Performance
• Avoid driving with a misfiring engine to prevent further damage
• Seek professional diagnosis if unsure about repairs
Check with the vehicle manufacturer for warranty coverage on engine components.
This code has been associated with wiring issues in certain BMW models due to their engine design.
Moderate – It's important to address this issue soon to avoid engine damage.
Driving with a misfiring engine may lead to unsafe driving conditions and potential legal issues if emissions are affected.
• Engine running
• Vehicle at operating temperature
The fuel injector for cylinder 6 is located on the engine, typically on the side of the cylinder head.
Q: What happens if I ignore this code?
A: Ignoring this code can lead to further engine damage and reduced performance.
Q: Can I fix this issue myself?
A: If you have basic automotive knowledge and tools, you might be able to fix wiring issues, but injector replacement might require professional help.
High-End · Full-system diagnostics
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Network faults often require full-system access instead of a generic code reader alone.
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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.