P1490
Vacuum Cut Valve Bypass Valve
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)
Symptoms
- Check Engine light comes on
- Unstable engine idling
- Deteriorating fuel economy
- Dips during acceleration
- Problems with the EGR system
Causes
- Open or short circuit in valve circuit
- Solenoid valve malfunction
- Damage to vacuum hoses
- Problems with the engine control unit
- Mechanical valve failure
How to Fix
- Check the integrity of the vacuum hoses
- Check valve electrical circuit
- Check valve resistance and operation
- Replace faulty valve
- Reset the error code and check the system