Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with the part of the car that helps spray fuel into the engine for cylinder number 5. It's not getting enough power to work right.
The engine control module (ECM) has detected that the high side circuit of the high-pressure injector for cylinder 5 is not receiving enough voltage.
The P3161 code indicates an issue with the electrical circuit that controls the high-pressure fuel injector for cylinder 5. The 'high side' refers to the positive side of the circuit, which is responsible for supplying the necessary voltage to the injector to operate correctly. A 'low' condition means that the voltage is below the expected level, which can affect the injector's performance and the engine's efficiency.
• Engine misfire
• Poor fuel economy
• Check Engine Light is on
• Faulty injector
• Wiring issues or poor connections
• Faulty ECM
Injector: A device that sprays fuel into the engine's cylinders.
ECM: Engine Control Module, the computer that controls engine functions.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for cylinder 5's injector.
• Test the injector's resistance and voltage supply.
• Repair or replace damaged wiring or connectors.
• Replace the faulty injector.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $600
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regular maintenance checks
• Ensure proper fuel quality
• Inspect electrical connections periodically
Engine Performance
• Have the vehicle inspected by a professional.
• Avoid driving long distances until the issue is resolved.
Check with your vehicle manufacturer for specific warranty coverage related to injectors.
This code is relatively uncommon and typically associated with specific vehicle models that use advanced fuel injection systems.
Moderate – Addressing this issue promptly can prevent further engine damage.
Ignoring this issue may lead to increased emissions and decreased vehicle performance.
• Engine running
• Warm engine
Cylinder 5 injector is located on the engine block, typically on the side where cylinder 5 is positioned.
Q: Can I drive with a P3161 code?
A: It's not recommended to drive for long periods with this code as it can lead to engine performance issues.
Q: How can I reset the Check Engine Light?
A: After repairs, use an OBD-II scanner to clear the code. If the issue is resolved, the light should stay off.
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.