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 the part of the car that helps spray fuel into cylinder 3 isn't working properly because there's a break in the electrical path.
The engine control module (ECM) has detected an open circuit in the high pressure injector circuit for cylinder 3, which means that the electrical connection is broken or not complete.
The P311C code indicates that the ECM has found an open circuit in the high pressure injector circuit for cylinder 3. This circuit is responsible for controlling the fuel injector, and an open circuit means that the electrical connection is interrupted, preventing the injector from functioning correctly.
• Check Engine Light is on
• Poor engine performance
• Engine misfire
• Faulty fuel injector
• Damaged wiring or connectors
• Faulty ECM
ECM: Engine Control Module
Injector: A device that sprays fuel into the engine's cylinders
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for cylinder 3 injector.
• Test the cylinder 3 injector for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the faulty fuel injector.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• BMW 3 Series
• Audi A4
• Volkswagen Passat
• Regular maintenance checks
• Ensure proper fuel quality
• Inspect wiring for damage periodically
Engine Performance
• Do not ignore the Check Engine Light.
• Seek professional diagnosis if unsure.
Check with your vehicle manufacturer for warranty coverage on fuel injectors.
This code is commonly associated with vehicles that have high mileage or have experienced wiring issues in the past.
Moderate – Addressing this issue promptly can prevent further engine damage.
Driving with a misfiring engine can lead to increased emissions and potential safety hazards.
• Engine at operating temperature
• Vehicle in idle or under load
The fuel injector for cylinder 3 is located on the engine, typically near the intake manifold.
Q: Can I drive with a P311C code?
A: It's not recommended as it can lead to poor engine performance and potential damage.
Q: How can I prevent this code from occurring?
A: Regular maintenance and inspections can help prevent wiring and injector issues.
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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.