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 there's a problem with the electrical part of the fuel injector for cylinder 6 in your car. It's like a light bulb that isn't working right because of a wiring issue.
The code indicates an electrical issue with the fuel injector for cylinder 6, specifically a short circuit or high resistance in the low side of the injector circuit.
P312D is triggered when the Engine Control Module (ECM) detects a short circuit or high resistance in the low side of the high-pressure fuel injector circuit for cylinder 6. This can affect the injector's ability to deliver the correct amount of fuel, leading to performance issues.
• Engine misfire
• Poor fuel economy
• Check Engine Light illuminated
• Faulty fuel injector for cylinder 6
• Damaged wiring or connectors in the injector circuit
• ECM malfunction
ECM: Engine Control Module
Injector: A device that sprays fuel into the engine's cylinders
• Use a diagnostic scanner to confirm the code.
• Inspect the wiring and connectors for cylinder 6 injector.
• Test the injector for proper resistance.
• Replace the faulty injector.
• Repair or replace damaged wiring/connectors.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• BMW 3 Series
• BMW 5 Series
• BMW X5
• Regular maintenance checks
• Ensure proper electrical connections
• Use high-quality fuel
Engine Performance
• Avoid driving with a misfire to prevent engine damage.
• Have the issue diagnosed and repaired promptly.
Check with your vehicle manufacturer or dealer for warranty coverage on fuel injectors.
This code is often associated with BMW vehicles and has been reported in models with direct fuel injection systems.
Moderate – Address the issue soon to avoid potential engine damage.
Driving with a misfire can lead to increased emissions and potential engine damage.
• 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: Can I drive my car with a P312D code?
A: It's not recommended to drive with this code active, as it can cause engine damage over time.
Q: How do I reset the Check Engine Light after fixing the issue?
A: You can reset the light using an OBD-II scanner, or it may turn off automatically after several driving cycles if the issue is resolved.
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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.