Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This means that the part of the car that helps spray fuel into the engine for cylinder number 3 is not getting enough power. It's like when a toy doesn't work because the batteries are low.
The engine control module (ECM) has detected a low voltage or open circuit condition in the high side of the high-pressure injector circuit for cylinder 3.
The P3155 code is triggered when the ECM detects that the high side circuit of the high-pressure fuel injector for cylinder 3 is not operating within the expected voltage range. This could be due to a wiring issue, a faulty injector, or problems with the ECM itself.
• Check Engine Light illuminated
• Engine misfire or rough idle
• Reduced engine performance
• Faulty fuel injector for cylinder 3
• Open or shorted wiring in the injector circuit
• Poor electrical connection at the injector or 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 and check for other related codes.
• Inspect the wiring and connectors for cylinder 3's injector for damage or corrosion.
• Test the fuel injector for proper resistance and operation.
• Repair or replace damaged wiring or connectors.
• Replace the faulty fuel injector.
• Clear the codes and test drive to ensure the issue is resolved.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• Toyota Camry
• Honda Accord
• Ford F-150
• Regularly inspect and maintain the fuel system.
• Ensure electrical connections are clean and secure.
• Use quality fuel to prevent injector clogging.
Engine Performance
• Avoid driving the vehicle until the issue is resolved to prevent further damage.
• Consult with a professional mechanic for accurate diagnosis and repair.
Check with the vehicle manufacturer for warranty coverage on fuel injectors and related components.
This code has been associated with injector and wiring issues in vehicles with direct fuel injection systems.
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 must be running.
• Code typically sets under load conditions.
The fuel injector for cylinder 3 is located on the engine, near the intake manifold on the side of the engine block.
Q: Can I drive with a P3155 code?
A: It's not recommended to drive with this code as it can lead to engine damage and reduced performance.
Q: How can I prevent this code from appearing?
A: Regular maintenance of the fuel system and ensuring all electrical connections are secure can help prevent this code.
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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.