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 fuel injector for cylinder 12 in the engine. It's not getting enough power to work properly.
The engine control module (ECM) has detected that the electrical circuit controlling the fuel injector for cylinder 12 is not getting enough voltage.
The P3145 code indicates that the low side circuit for the high-pressure fuel injector in cylinder 12 is experiencing a low voltage condition. This can be due to wiring issues, a faulty injector, or problems with the ECM itself.
• Engine misfire
• Poor fuel economy
• Check engine light on
• Faulty fuel injector
• Wiring issues in the injector circuit
• Faulty engine control module (ECM)
ECM: Engine Control Module
Injector: Device that sprays fuel into the engine
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for the injector.
• Test the injector for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the faulty fuel injector.
• Replace or reprogram the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$200 - $600
Moderate
• Vehicle 1
• Vehicle 2
• Vehicle 3
• Regular maintenance checks
• Ensure proper electrical connections
• Use quality fuel
Engine Performance
• Have the vehicle inspected by a professional.
• Avoid driving the vehicle if it is misfiring.
• Regularly check for warning lights.
Check with the vehicle manufacturer for warranty coverage on fuel injectors.
This code has been associated with injector issues in high-performance engines.
Moderate – Address the issue soon to avoid engine damage.
Ignoring this code can lead to increased emissions and potential engine damage.
• Engine at operating temperature
• Vehicle in a safe environment for testing
The fuel injector is located on the engine, typically near the intake manifold.
Q: Can I drive with a P3145 code?
A: It's not recommended to drive for long with this code, as it can cause engine damage.
Q: How can I reset the check engine light?
A: You can use an OBD-II scanner to clear the code, but it's important to fix the issue first.
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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.