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 detecting a problem with the signal that controls one of the ignition coils. It's like a light switch that's stuck in the 'on' position for too long.
The P031F code indicates that the voltage in the ignition control circuit for coil D is higher than expected.
The ignition control module or the powertrain control module (PCM) monitors the voltage levels of the ignition coil circuits. If the voltage in the circuit for ignition coil D is higher than the specified range, it triggers the P031F code. This could be due to a short circuit, a faulty ignition coil, or issues with the PCM.
• Check Engine Light is on
• Engine misfires
• Poor engine performance
• Faulty ignition coil D
• Wiring issues such as short to voltage
• Faulty powertrain control module (PCM)
PCM: Powertrain Control Module
OBD-II: On-Board Diagnostics, second generation
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for ignition coil D.
• Test the ignition coil D for proper operation.
• Replace faulty ignition coil D.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the PCM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect ignition system components.
• Ensure proper maintenance of electrical connections.
• Use quality replacement parts.
Engine Performance
• Do not ignore the Check Engine Light.
• Seek professional diagnostics if unsure.
• Avoid driving with a misfiring engine.
Check with your vehicle manufacturer for warranty coverage on ignition components.
This code is relatively uncommon and often associated with specific ignition system failures.
Moderate – Addressing this issue promptly can prevent further engine damage.
Driving with a misfiring engine can lead to increased emissions and potential engine damage.
• Engine running
• Ignition system active
The ignition coil D is typically located on the engine, near the spark plugs.
Q: Can I drive with a P031F code?
A: It's not recommended to drive for long periods with this code, as it can lead to engine damage.
Q: How do I clear the P031F code?
A: After repairs, use an OBD-II scanner to clear the code and verify that it does not return.
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.
View options on Amazon
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.