P1799 Buick Hold Switch Circuit Malfunction

P1800 Buick Transmission Clutch Interlock Safety Switch Circuit Failure

Possible causes
  • Harness or connectors (The solenoid valve circuit is open or shorted.)
  • VIAS control solenoid valve
    • What about the obd code?
  • An excessively low or high voltage signal is sent to ECM through the valve
    • Symptoms
    – Engine Light ON (or Service Engine Soon Warning Light)
    P1800 Buick Description

    The VIAS control solenoid valve cuts the intake manifold vacuum signal for power valve control. It responds to ON/OFF signals from the ECM. When the solenoid is off, the vacuum signal from the intake manifold is cut. When the ECM sends an ON signal the coil pulls the plunger downward and feeds the vacuum signal to the power valve actuator.

    Buick Vehicle:Buick Regal – ?Buick Riviera – ?Buick LaCrosse – ?David Dunbar Buick – Buick Century – Buick LaCrosse – Buick LeSabre – Buick Lucerne – Buick Park Avenue – Buick Regal – Buick Verano – Buick Enclave – Buick Encore – Buick Rainier – Buick Rendezvous – Buick Terraza – Buick Riviera