P2420 Buick Evaporative Emission (EVAP) System Switching Valve Control Circuit High

P2421 Buick Evaporative Emission (EVAP) System Vent Valve Stuck Open

OBD Code:
System:
Subsystem:

P2421 Buick – (ASE)
Powertrain
Auxiliary Emission Controls

Trouble Code Description: Evaporative Emission (EVAP) System Vent Valve Stuck Open

Location:
Analysis:

Possible Causes:

Stuck Open

Tech description:

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