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 not getting a strong enough signal from the part that helps start the engine. Imagine trying to talk to someone on the phone, but the signal is very weak.
The P031E code is triggered when the Engine Control Module (ECM) detects a low voltage or weak signal in the ignition control circuit for cylinder D.
The Ignition D Control Signal Circuit is responsible for managing the ignition timing and firing of the spark plug in one of the engine's cylinders. A low signal indicates that the ECM is receiving a voltage that is below the expected range, which can affect engine performance.
• Engine misfire
• Poor acceleration
• Check Engine Light illuminated
• Faulty ignition coil
• Wiring issues or poor connections in the ignition circuit
• Defective ECM
ECM: Engine Control Module, the computer that controls engine functions.
Ignition Coil: A component that transforms battery voltage into the high voltage needed to create a spark in the spark plugs.
• Use an OBD-II scanner to confirm the code.
• Inspect the ignition coil and its connections for damage or corrosion.
• Test the voltage and continuity of the ignition circuit.
• Replace the faulty ignition coil.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Socket set
$150 - $500
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regular maintenance of ignition system components
• Ensure all electrical connections are secure
• Use quality replacement parts
Engine Performance
• Avoid driving the vehicle if the engine is misfiring.
• Seek professional diagnostic services if unsure about repairs.
Check with the vehicle manufacturer for specific warranty coverage related to ignition system components.
This code has been more prevalent in vehicles with high mileage or those that have not had regular ignition system maintenance.
Moderate – It is advisable to address this issue soon to prevent engine performance problems.
Driving with a misfiring engine can lead to increased emissions and potential engine damage.
• Engine at operating temperature
• Vehicle in idle or under load
The ignition coil is typically located on top of the engine, near the spark plugs.
Q: Can I drive with a P031E code?
A: It's not recommended to drive for long periods with this code, as it can lead to engine performance issues.
Q: How can I prevent this code from appearing?
A: Regular maintenance and checking for secure electrical connections can help prevent this code.
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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.