Renault laguna ii?

IN SOME CASES THE renault laguna ii "auto" warning light orange indicator light on the dashboard will turn on, butthe car keeps on driving smoothly without any problems. I had a diagnostic check and it came up with pressure regulator valve problem, code 177. Please advise further actions and the way forward.

Manufacturer:RENAULT
Model:LAGUNA HATCHBACK - 2.0 16V Dynamique 5dr Auto
Year:2004

Transmission:Automatic
Engine Size:2000
First Registered:30/04/2004