P1520
Intake Manifold Runner Control Circuit Fault
Severity
⚠️ MediumCan you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–67 (est.)
Symptoms
- Reduced engine power
- Increased fuel consumption
- Rough engine idling
- Check Engine Light Is On
- The engine goes into emergency mode
Causes
- Damper control solenoid valve malfunction
- Open or short circuit in control circuit
- Mechanical jamming of dampers
- Problems with the engine control unit
- Oxidation of contacts in connectors
How to Fix
- Check the integrity of wiring and connectors
- Test the control solenoid valve
- Check the mechanical part of the dampers for free movement
- Clean or replace faulty components
- Reset the error and check the system operation