Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer has detected that the electrical circuit controlling the fuel injector for cylinder 4 is getting too much power.
This code indicates that the high side circuit for the high-pressure injector in cylinder 4 is receiving a voltage that is higher than expected.
The P3159 code is triggered when the engine control module (ECM) detects a high voltage condition in the high side circuit of the high-pressure fuel injector for cylinder 4. This could be due to a short circuit, a faulty injector, or issues with the wiring or connectors.
• Engine misfire
• Reduced engine performance
• Check Engine Light illuminated
• Faulty fuel injector
• Short circuit in the wiring
• 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 4's injector.
• Test the fuel 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
• Fuel injector tester
$200 - $600
Moderate
• Toyota Prius
• Lexus RX
• Honda Accord
• Regular maintenance checks
• Keep electrical connections clean
• Use quality fuel
Engine Performance
• Do not ignore the Check Engine Light.
• Get the vehicle inspected by a professional mechanic.
Check with the vehicle manufacturer for warranty coverage on engine components.
This code has been associated with issues in vehicles with direct fuel injection systems.
Moderate – Should be addressed soon to prevent further engine issues.
Driving with a malfunctioning injector can lead to increased emissions and potential engine damage.
• Engine running
• Warm engine
The fuel injector for cylinder 4 is located on the engine's cylinder head, typically near the intake manifold.
Q: Can I drive with the P3159 code?
A: It's not recommended to drive for extended periods with this code, as it can lead to engine damage.
Q: How can I reset the Check Engine Light?
A: You can reset it with an OBD-II scanner, but it's important to fix the underlying 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.