Where is the location of pcm for 1991 Buick Riviera?

The Powertrain Control Module (PCM) for the 1991 Buick Riviera is typically located in the engine compartment, mounted on the firewall, near the passenger side. It may be covered by a protective panel or insulation material. For precise access, it's advisable to consult the vehicle's service manual or a repair guide specific to that model.