P1490 Code - Vacuum Cut Valve Bypass Valve
Quick Answer
The vacuum cut valve and vacuum cut valve bypass valve are installed in parallel on the EVAP purge line between the fuel tank and the EVAP canister. Common causes include Faulty Vacuum Cut Valve Bypass Valve, Clogged vacuum hoses to the Vacuum Cut Valve Bypass Valve, Vacuum cut valve bypass valve harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1490 indicates Vacuum Cut Valve Bypass Valve.
- Common causes
- Common causes include Faulty Vacuum Cut Valve Bypass Valve, Clogged vacuum hoses to the Vacuum Cut Valve Bypass Valve, Vacuum cut valve bypass valve harness is open or shorted.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1490 Description
The vacuum cut valve prevents the intake manifold vacuum from being applied to the fuel tank. The vacuum cut valve bypass valve is a solenoid type valve and generally remains closed. It opens only for on board diagnosis.
The vacuum cut valve bypass valve responds to signals from the Engine Control Module (ECM). When the ECM sends an ON (ground) signal, the valve is opened. The vacuum cut valve is then bypassed to apply intake manifold vacuum to the fuel tank.
What are the Possible Causes of the DTC P1490?
- Faulty Vacuum Cut Valve Bypass Valve
- Clogged vacuum hoses to the Vacuum Cut Valve Bypass Valve
- Vacuum cut valve bypass valve harness is open or shorted
- Vacuum cut valve bypass valve electrical circuit poor connection
How to Fix the DTC P1490?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1490 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Information for Specific Makes
- P1490 Audi — EVAP Canister Purge Regulator Valve 2 Short To Ground
- P1490 Buick — EVAP Purge Pump Voltage Sensor Performance
- P1490 Cadillac — EVAP Purge Pump Voltage Sensor Performance
- P1490 Chevrolet — EVAP Purge Pump Voltage Sensor Performance
- P1490 Chrysler — Low Speed Radiator Fan Control Relay Condition
- P1490 Dodge — Low Speed Radiator Fan Control Relay Condition
- P1490 GMC — EVAP Purge Pump Voltage Sensor Performance
- P1490 Infiniti — Vacuum Cut Valve Bypass Valve
- P1490 Jeep — Low Speed Radiator Fan Control Relay Condition
- P1490 Mercedes-Benz — Evaporative Emission Canister Purge Valve Defective
- P1490 Mitsubishi — Low Speed Radiator Fan Control Relay Condition
- P1490 Nissan — Vacuum Cut Valve Bypass Valve
- P1490 Subaru — Thermostat Malfunction
- P1490 Volkswagen — EVAP Canister Purge Regulator Valve 2 Short To Ground
Frequently Asked Questions about P1490 Code
No Frequently Asked Questions about P1490 Code found.
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