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 part of the car that helps control how fuel is injected into one of the engine's cylinders. It's like a broken wire or switch that stops the fuel from being delivered properly.
The engine control module (ECM) has detected an issue with the electrical circuit that controls the fuel injector for cylinder 11. This could be due to an open circuit or a faulty connection.
P31AB indicates that the ECM has identified a malfunction in the low side circuit of the hydrogen injector for cylinder 11. This could be due to an open circuit, poor connection, or a faulty injector. The low side circuit is responsible for grounding the injector to complete the circuit and allow it to function properly.
• Engine misfire
• Reduced engine performance
• Check Engine Light illuminated
• Faulty injector
• Open or shorted wiring in the injector circuit
• Poor electrical connection
ECM: Engine Control Module
Injector: A device that delivers fuel into the engine's cylinders
• Perform a visual inspection of the injector wiring and connectors.
• Use a multimeter to check for continuity in the injector circuit.
• Test the injector for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the faulty injector.
• Clear the code and test drive the vehicle to ensure the issue is resolved.
• Multimeter
• OBD-II scanner
• Basic hand tools
$150 - $500
Moderate
• Vehicle 1
• Vehicle 2
• Vehicle 3
• Regular maintenance checks
• Ensure proper fuel quality
• Inspect wiring for wear and tear
Engine Performance
• Do not ignore the Check Engine Light.
• Seek professional diagnosis if unsure.
• Avoid driving the vehicle if performance issues are severe.
Check with the vehicle manufacturer for specific warranty coverage related to fuel injectors.
This code is relatively uncommon and typically associated with vehicles using advanced fuel systems like hydrogen.
Moderate – Addressing this issue can prevent further engine performance problems.
Driving with a malfunctioning injector can lead to increased emissions and reduced fuel efficiency.
• Engine running
• Vehicle in park or neutral
The injector for cylinder 11 is located on the engine block, typically near the intake manifold.
Q: What happens if I ignore this code?
A: Ignoring this code can lead to poor engine performance and potentially damage other engine components.
Q: Can I fix this problem myself?
A: If you have experience with car repairs and the right tools, you might be able to fix it. Otherwise, it's best to see a professional.
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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.