Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the computer in your car is getting too much power to the fuel injectors on one side of the engine. It's like when you plug too many things into an outlet and it gets overloaded.
The Engine Control Module (ECM) is detecting a higher than normal voltage in the supply line to the high-pressure injectors on Bank 2 of the engine.
The P31E1 code is triggered when the ECM detects an abnormally high voltage in the supply circuit for the high-pressure injectors on Bank 2. This could be due to a fault in the wiring, connectors, or the ECM itself. Bank 2 refers to the side of the engine that does not contain cylinder 1.
• Check Engine Light illuminated
• Engine misfires
• Poor fuel economy
• Faulty ECM
• Wiring issues such as shorts or open circuits
• Defective high-pressure injector
ECM: Engine Control Module, the computer that controls engine functions.
Injector: A component that sprays fuel into the engine's cylinders.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the voltage supply to the injectors.
• Repair or replace damaged wiring or connectors.
• Replace faulty high-pressure injectors.
• Replace or reprogram the ECM if necessary.
• OBD-II scanner
• Multimeter
• Wiring repair tools
$200 - $1000
Moderate
• Vehicle 1
• Vehicle 2
• Vehicle 3
• Regular maintenance and inspection of wiring.
• Avoid overloading the vehicle's electrical system.
• Ensure proper ECM updates and programming.
Engine Performance
• Do not ignore the Check Engine Light.
• Consult a professional mechanic for accurate diagnosis.
• Avoid driving the vehicle if severe symptoms are present.
Check with your vehicle manufacturer for specific warranty coverage on the ECM and injectors.
This code has been associated with vehicles that have experienced electrical issues or modifications.
Moderate – It should be addressed soon to prevent further engine performance issues.
Driving with a malfunctioning ECM or injectors can lead to unsafe driving conditions.
• Engine at operating temperature
• Vehicle in a safe, stationary position
The high-pressure injectors are located on the engine, typically on the intake manifold or cylinder head.
Q: Can I drive with a P31E1 code?
A: It's not recommended to drive with this code as it can lead to poor engine performance and increased fuel consumption.
Q: What happens if I ignore the P31E1 code?
A: Ignoring the code can lead to more severe engine problems and potential damage to the ECM or injectors.
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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.