Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer is saying that the part that puts fuel into cylinder number 7 is not getting enough power to work properly.
This code indicates that the fuel injector circuit for cylinder 7 is experiencing a low voltage condition, which can affect the injector's ability to deliver fuel properly.
The P0279 code is triggered when the Engine Control Module (ECM) detects a low voltage condition in the fuel injector circuit for cylinder 7. This can be due to issues such as a poor electrical connection, a faulty injector, or a problem with the wiring harness.
• Engine misfire
• Rough idle
• Decreased fuel efficiency
• Faulty fuel injector
• Poor electrical connection
• Damaged wiring harness
ECM: Engine Control Module, the computer that controls engine functions.
Injector: A device that sprays fuel into the engine's cylinders.
• Check for any loose or damaged connectors at the injector.
• Inspect the wiring harness for any signs of damage.
• Test the injector for proper resistance and operation.
• Repair or replace damaged wiring or connectors.
• Replace the faulty injector.
• Clear the code and test drive to ensure the issue is resolved.
• Multimeter
• OBD-II scanner
• Basic hand tools
$150 - $400
Moderate
• Ford F-150
• Chevrolet Silverado
• Dodge Ram
• Regularly inspect and maintain the fuel system.
• Ensure all electrical connections are secure.
• Use quality fuel to prevent injector clogging.
Engine Performance
• Avoid driving with a misfiring engine to prevent further damage.
• Have the vehicle inspected by a professional mechanic if unsure.
Check with your vehicle manufacturer or warranty provider to see if the fuel system components are covered.
This code has been associated with injector circuit issues in various vehicle models, often due to wiring or connector problems.
Moderate – It should be addressed soon to prevent further engine performance issues.
Driving with a misfiring engine can lead to increased emissions and potential damage to the catalytic converter.
• Engine at operating temperature
• Vehicle in a safe, stationary position
The fuel injector for cylinder 7 is typically located on the engine block, near the intake manifold.
Q: Can I drive with a P0279 code?
A: It's not recommended to drive for long with this code, as it can lead to engine damage and poor performance.
Q: How can I prevent injector issues?
A: Regular maintenance and using quality fuel can help prevent injector problems.
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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.