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 squirts fuel into the engine, called an injector, is stuck open for cylinder number 7. It's like a water tap that won't stop pouring water.
The P305C code indicates that the fuel injector for cylinder 7 is not closing properly, causing too much fuel to enter the engine.
The P305C code is triggered when the engine control module (ECM) detects that the injector for cylinder 7 is stuck in the open position. This can lead to excessive fuel entering the combustion chamber, which can cause misfires, increased emissions, and poor engine performance.
• Engine misfire
• Poor fuel economy
• Rough idle
• Faulty injector
• Wiring issues
• ECM malfunction
Injector: A device that sprays fuel into the engine's combustion chamber.
ECM: Engine Control Module, the computer that controls the engine's functions.
• Check for any other related codes.
• Inspect the injector wiring and connectors.
• Test the injector for proper operation.
• Replace the faulty injector.
• Repair or replace damaged wiring.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Fuel injector tester
$150 - $400
Moderate
• Chevrolet Silverado
• Ford F-150
• Dodge Ram
• Regular maintenance and inspection of injectors.
• Use high-quality fuel.
• Keep the fuel system clean.
Engine Performance
• Avoid driving the vehicle until repaired to prevent further damage.
• Consult with a professional mechanic for accurate diagnosis.
Injector issues may be covered under the powertrain warranty. Check with your manufacturer.
Injector issues have been a common problem in vehicles with high mileage or poor maintenance.
High – This issue can lead to significant engine damage if not addressed promptly.
Driving with a malfunctioning injector can lead to increased emissions and potential safety hazards.
• Engine at operating temperature
• Vehicle in a safe, stationary position
The fuel injector for cylinder 7 is located on the engine block, near the intake manifold.
Q: Can I drive with a P305C code?
A: It's not recommended to drive with this code as it can cause engine damage.
Q: How can I prevent injector problems?
A: Regular maintenance and using high-quality fuel can help prevent injector issues.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
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.
View on Amazon
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.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.
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.
View options on Amazon
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.