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 much fuel goes into the engine. It's like when a straw is blocked and you can't drink your juice properly.
The code indicates an issue with the electrical circuit that controls the fuel injector for cylinder 1. It may be open or have a low voltage.
P316D is a diagnostic trouble code indicating a malfunction in the low side circuit of the hydrogen injector for cylinder 1. This could be due to an open circuit or insufficient voltage reaching the injector, preventing it from operating correctly.
• Engine misfire
• Reduced fuel efficiency
• Check Engine Light on
• Faulty injector
• Damaged wiring or connectors
• ECU malfunction
Injector: A device that sprays fuel into the engine.
ECU: Engine Control Unit, the computer that manages engine functions.
• Inspect the injector and wiring for damage.
• Check for continuity in the circuit.
• Test the ECU output to the injector.
• Replace the faulty injector.
• Repair or replace damaged wiring.
• Reprogram or replace the ECU if necessary.
• Multimeter
• OBD-II scanner
• Wiring repair kit
$150 - $500
Moderate
• Toyota Mirai
• Hyundai Nexo
• Honda Clarity Fuel Cell
• Regularly inspect wiring and connectors.
• Ensure proper vehicle maintenance.
• Avoid harsh driving conditions.
Engine Performance
• Avoid driving the vehicle until repaired.
• Consult a professional mechanic.
• Keep up with regular maintenance.
Check with manufacturer for warranty coverage on fuel system components.
This code is relatively new and specific to hydrogen fuel cell vehicles, reflecting advancements in alternative fuel technology.
High – This issue can lead to engine performance problems and should be addressed promptly.
Driving with this issue may violate emissions regulations and could lead to further engine damage.
• Engine at operating temperature
• Vehicle in a safe, stationary position
The injector is located on the engine, typically near the intake manifold for cylinder 1.
Q: Can I drive with a P316D code?
A: It's not recommended as it can cause engine performance issues.
Q: How do I clear a P316D code?
A: After repairs, use an OBD-II scanner to clear the code.
Budget · Bluetooth scanner
An app-based scanner with repair reports and enhanced system diagnostics on supported vehicles.
Helpful when live data and repair-report guidance can narrow down a drivability issue.
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Specialty · Fuel pressure tester
Helpful for no-start, lean, rich, injector, and fuel-delivery diagnosis.
Useful for checking whether fuel delivery is contributing to the fault.
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Specialty · Compression tester
Useful when misfire, mechanical condition, or low-cylinder-pressure problems are suspected.
Helpful when you need to rule out low compression or mechanical engine problems.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.
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.