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 spring that helps control how much air goes into the engine. It's like if a spring in a toy got stuck and the toy didn't work right.
The throttle valve actuator controls the amount of air entering the engine. The spring test checks if the spring that returns the throttle to its default position is working properly.
The P1631 code indicates a failure in the throttle valve actuator spring test for bank 1. This means that the spring responsible for returning the throttle valve to its default position is not functioning correctly. The throttle actuator is an electronic device that controls the throttle position based on input from the engine control unit (ECU). If the spring test fails, it can affect the vehicle's performance and throttle response.
• Check Engine Light is on
• Reduced engine performance
• Poor throttle response
• Faulty throttle valve actuator
• Damaged or worn throttle return spring
• Electrical issues in the throttle control circuit
Throttle Valve Actuator: An electronic device that controls the position of the throttle valve.
Bank 1: The side of the engine with cylinder number 1, typically the driver's side in a V-engine.
• Use an OBD-II scanner to confirm the code.
• Inspect the throttle valve actuator and spring for damage.
• Check the wiring and connections in the throttle control circuit.
• Replace the throttle valve actuator if faulty.
• Repair or replace the throttle return spring if damaged.
• Fix any electrical issues in the throttle control circuit.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regularly inspect the throttle system.
• Ensure proper maintenance of the throttle actuator.
• Check for electrical issues periodically.
Engine Performance
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional if unsure.
• Regular maintenance can prevent such issues.
Check with the vehicle manufacturer for warranty coverage on throttle components.
This code has been associated with throttle actuator issues in vehicles with electronic throttle control systems.
Moderate – This issue should be addressed soon to prevent further engine performance problems.
Driving with a malfunctioning throttle system can lead to reduced performance and may affect vehicle safety.
• Engine at operating temperature
• Vehicle in park or neutral
The throttle valve actuator is typically located on the intake manifold, near the throttle body.
Q: Can I drive with a P1631 code?
A: It's not recommended to drive for long periods with this code, as it can affect engine performance and safety.
Q: How can I prevent P1631 from occurring?
A: Regular maintenance and inspections of the throttle system 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.