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 computer in your car has detected a problem with the electrical circuit that controls the fuel injector for cylinder number 6. It's like a light switch that is stuck in the 'on' position, sending too much power to the injector.
The P3165 code indicates that the engine control module (ECM) has detected a high voltage condition in the high pressure injector circuit for cylinder 6.
The high pressure fuel injector in cylinder 6 is controlled by the ECM, which sends electrical signals to open and close the injector. If the voltage in this circuit is higher than expected, it can cause the injector to malfunction, leading to improper fuel delivery and engine performance issues.
• Engine misfire
• Poor fuel economy
• Check engine light on
• Faulty fuel injector
• Wiring issues in the injector circuit
• Faulty ECM
ECM: Engine Control Module
OBD-II: On-Board Diagnostics, Second Generation
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for cylinder 6 injector.
• Test the fuel injector for proper operation.
• Repair or replace damaged wiring.
• Replace the faulty fuel injector.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Fuel injector tester
$150 - $500
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regular maintenance checks
• Timely replacement of fuel filters
• Avoiding poor quality fuel
Engine Performance
• Do not ignore the check engine light.
• Have the vehicle inspected by a professional.
• Avoid driving the vehicle until repaired to prevent further damage.
Check with your vehicle manufacturer for warranty coverage on the ECM and fuel injectors.
This code has been reported in various vehicles with direct fuel injection systems, often related to wiring issues or injector failures.
High – This issue can lead to engine performance problems and should be addressed promptly.
Driving with this code active 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 with a P3165 code?
A: It's not recommended to drive with this code active as it can cause engine performance issues and potential damage.
Q: How do I know if my fuel injector is bad?
A: Signs of a bad fuel injector include engine misfires, poor fuel economy, and a check engine light.
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.