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 part of the car that controls how much air goes into the engine is having trouble because some wires are touching that shouldn't be.
The throttle actuator controls the engine's airflow. A short circuit in its motor circuit can disrupt this control, affecting engine performance.
The P31BD code indicates a short circuit in the throttle actuator 'A' control motor circuit. This means that the electrical pathway that controls the throttle actuator is compromised, usually due to wires touching each other or a grounded circuit. This can lead to improper throttle control and engine performance issues.
• Engine misfires
• Poor acceleration
• Check Engine Light is on
• Damaged wiring or connectors
• Faulty throttle actuator motor
• Corroded electrical connections
Throttle Actuator: A device that controls the amount of air entering the engine.
Short Circuit: An electrical circuit that allows a current to travel along an unintended path.
• Perform a visual inspection of the throttle actuator wiring and connectors.
• Use a multimeter to check for continuity and shorts in the circuit.
• Test the throttle actuator motor for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the throttle actuator motor if faulty.
• Clean and secure all electrical connections.
• Multimeter
• OBD-II scanner
• Screwdriver set
$150 - $400
Moderate
• Toyota Camry
• Honda Accord
• Ford F-150
• Regularly inspect wiring for damage.
• Keep electrical connections clean and secure.
• Avoid exposure to excessive moisture.
Sensor Issue
• Do not ignore the Check Engine Light.
• Get the vehicle inspected by a professional.
• Avoid driving at high speeds until repaired.
Check with your vehicle manufacturer for warranty coverage on throttle actuator components.
This code has been associated with throttle control issues in vehicles with electronic throttle bodies.
High – This issue can affect vehicle drivability and should be addressed promptly.
Driving with a malfunctioning throttle actuator can lead to unsafe driving conditions. Address this issue immediately.
• Engine running
• Throttle actuator engaged
The throttle actuator is typically located on the intake manifold, near the throttle body.
Q: Can I drive with a P31BD code?
A: It's not recommended to drive with this code as it can affect engine performance and safety.
Q: How can I prevent this issue?
A: Regular maintenance and inspection of the throttle actuator and its wiring can help prevent this issue.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
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.
View on Amazon
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.
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.
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.