Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This means there's a problem with the part that helps put fuel into one of the car's cylinders. It's like a broken straw that can't get juice into your cup.
The code indicates an issue with the electrical circuit that controls the injector for cylinder 2, which is responsible for delivering hydrogen fuel.
P317A is triggered when the engine control module (ECM) detects an open or low voltage condition in the low side circuit of the hydrogen injector for cylinder 2. This could be due to a wiring issue, a faulty injector, or a problem with the ECM itself.
• Check engine light is on
• Engine misfires
• Poor fuel economy
• Faulty hydrogen injector
• Damaged wiring or connectors
• Failed engine control module (ECM)
ECM: Engine Control Module
Injector: A device that introduces fuel into the engine
• Check for any loose or damaged wiring connected to the injector.
• Test the hydrogen injector for proper operation.
• Inspect the ECM for faults.
• Repair or replace damaged wiring or connectors.
• Replace the faulty hydrogen injector.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Wiring repair tools
$200 - $800
Moderate
• Toyota Mirai
• Hyundai Nexo
• Honda Clarity Fuel Cell
• Regularly inspect wiring and connectors for damage.
• Ensure hydrogen injectors are serviced as per the manufacturer's schedule.
• Keep the ECM updated with the latest software.
Engine Performance
• Avoid driving the vehicle until the issue is diagnosed and repaired.
• Consult a professional mechanic for accurate diagnosis.
Check with your vehicle manufacturer for specific warranty coverage on hydrogen fuel systems.
This code is relatively rare and specific to hydrogen fuel cell vehicles, indicating a specialized issue in newer automotive technology.
High – This issue can affect vehicle performance and should be addressed promptly to avoid further damage.
Operating a vehicle with this code can lead to increased emissions and potential safety issues.
• Engine running
• Hydrogen fuel system active
The hydrogen injector for cylinder 2 is located on the engine, typically near the intake manifold.
Q: Can I drive with a P317A code?
A: It's not recommended to drive with this code as it can lead to engine performance issues.
Q: What happens if I ignore this code?
A: Ignoring this code can result in poor engine performance and potential damage to the hydrogen fuel system.
High-End · Full-system diagnostics
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Network faults often require full-system access instead of a generic code reader alone.
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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.