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 car's computer is having trouble with a part that helps inject fuel into the engine. It's like when a squirt gun doesn't work right and doesn't spray water properly.
The engine control module (ECM) is detecting an issue with the high-pressure injector operation on Bank 2, possibly due to replacement values being used.
P31EB indicates a problem with the high-pressure fuel injector operation on Bank 2, where the ECM is using replacement values instead of real-time data. This can affect fuel delivery and engine performance.
• Engine misfire
• Reduced fuel efficiency
• Check engine light on
• Faulty high-pressure injector
• Wiring issues in the injector circuit
• ECM software issue
ECM: Engine Control Module
Injector: A device that sprays fuel into the engine
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors of the high-pressure injector on Bank 2.
• Check the injector for proper operation.
• Replace the faulty injector.
• Repair or replace damaged wiring.
• Update or reprogram the ECM if necessary.
• OBD-II scanner
• Multimeter
• Fuel injector tester
$200 - $600
Moderate
• Vehicle 1
• Vehicle 2
• Vehicle 3
• Regular maintenance of fuel system
• Use high-quality fuel
• Ensure timely software updates
Engine Performance
• Avoid driving the vehicle until repaired to prevent further damage.
• Consult a professional mechanic for accurate diagnosis.
Check with the vehicle manufacturer for warranty coverage on fuel injectors.
This code has been associated with injector issues in certain models due to faulty components or software glitches.
Moderate – It should be addressed soon to avoid further engine performance issues.
Ignoring this code could lead to increased emissions and potential safety issues.
• Engine running
• Normal operating temperature
The high-pressure injector is located on the engine's Bank 2, typically on the side opposite the number one cylinder.
Q: Can I drive with a P31EB code?
A: It's not recommended to drive with this code as it can lead to further engine issues.
Q: How can I prevent this code from appearing?
A: Regular maintenance and using quality fuel can help prevent this issue.
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Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
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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.