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 thinks the part that controls how fast the engine idles is letting in too much air. It's like if you were trying to hold a balloon's opening shut, but air keeps escaping because you're not pinching it tight enough.
The P1506 code is triggered when the Engine Control Module (ECM) detects that the Idle Speed Control (ISC) valve is open more than it should be, allowing too much air into the engine.
The Idle Speed Control Valve is responsible for maintaining a stable engine idle speed. When the valve's solenoid control circuit is detected to be high, it indicates that the valve is allowing more air than required, affecting the engine's idle speed.
• Engine idles too high
• Check Engine Light is on
• Engine may stall or run rough
• Faulty Idle Speed Control Valve
• Wiring issues in the ISC valve circuit
• Faulty ECM
ECM: Engine Control Module
ISC: Idle Speed Control
• Check for other codes that might be present.
• Inspect the ISC valve and its wiring for damage.
• Use a multimeter to test the ISC valve solenoid.
• Replace the Idle Speed Control Valve if faulty.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Ford Focus
• Mazda 3
• Toyota Camry
• Regular maintenance of the idle control system
• Ensure electrical connections are clean and secure
• Regularly check for vacuum leaks
Engine Performance
• If the check engine light is on, avoid driving at high speeds.
• Get the vehicle diagnosed and repaired promptly to avoid further issues.
Check with your vehicle's manufacturer for warranty coverage on engine components.
The P1506 code has been a common issue in vehicles with electronic throttle control systems, particularly in models from the early 2000s.
Moderate – It is advisable to address this issue soon to prevent potential stalling or rough idling.
Driving with a malfunctioning idle control system can lead to unsafe driving conditions. Always ensure your vehicle is in good working order.
• Engine at operating temperature
• Vehicle in park or neutral
The Idle Speed Control Valve is typically located on or near the throttle body of the engine.
Q: Can I drive with a P1506 code?
A: It's possible, but not recommended. The vehicle may idle too high or stall, which can be dangerous.
Q: How can I reset the check engine light?
A: You can use an OBD-II scanner to clear the code, but it's important to fix the underlying issue first.
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.