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 injector for cylinder 6 in your car's engine. It's like a little nozzle that sprays fuel, and it's getting too much power from the car's computer.
The engine control module (ECM) has detected an unusually high voltage in the low side circuit of the high-pressure injector for cylinder 6.
The P3122 code indicates that the ECM has detected a high voltage condition in the low side circuit of the high-pressure fuel injector for cylinder 6. This can be due to a short circuit, an open circuit, or a faulty injector. The low side circuit is responsible for grounding the injector, and a high condition suggests an electrical issue.
• Check Engine Light is on
• Engine misfires or runs rough
• Poor fuel economy
• Faulty fuel injector for cylinder 6
• Wiring issues such as short circuits or open circuits
• Faulty ECM
ECM: Engine Control Module, the computer that controls engine functions.
Injector: A device that sprays fuel into the engine's combustion chamber.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for cylinder 6 injector.
• Test the injector for proper resistance and operation.
• Repair or replace damaged wiring or connectors.
• Replace the faulty injector for cylinder 6.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• Vehicle 1
• Vehicle 2
• Vehicle 3
• Regular maintenance and inspection of engine components.
• Ensure fuel injectors are clean and functioning properly.
• Check electrical connections regularly.
Engine Performance
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional mechanic.
• Avoid driving the vehicle if it runs rough.
Check with your vehicle's manufacturer for specific warranty coverage on engine components.
This code is relatively uncommon and typically associated with specific engine configurations that use high-pressure fuel injectors.
Moderate – While the vehicle may still be drivable, it can lead to further engine damage if not addressed promptly.
Driving with a malfunctioning injector can lead to increased emissions and potential engine damage.
• Engine running
• Vehicle at operating temperature
The injector for cylinder 6 is located on the engine, typically on the side or top, depending on the engine configuration.
Q: Can I drive with a P3122 code?
A: It's not recommended to drive for long periods with this code, as it can lead to engine damage.
Q: How can I clear the P3122 code?
A: The code can be cleared with an OBD-II scanner after repairs are made, but it will return if the issue is not resolved.
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Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
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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.