P1804 Buick Transmission 4-Wheel Drive High Indicator Circuit Failure

P1805 Buick Transmission 4-Wheel Drive High Indicator Open Circuit

What about the obd code?
  • A brake switch signal is not sent to ECM for an extremely long time while the vehicle is driving.
    • Symptoms
    – Engine Light ON (or Service Engine Soon Warning Light)
    P1805 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