Turbo Boost gauge pegged

[jwm4007]

Just returned from a short trip (300 miles round trip). On the way home I noticed the turbo boost gauge was pegged at 35 lbs. Did not notice any loss of power running 60 MPH but was on all flat roads. Changed air filter when I got back and did not fix the problem. Is there anything else I should check before scheduling an appointment in the shop? The gauge appears to be working fine as it cycles from 0 to 35 then back to 0 when I turn on the key. It immediately goes to 35 when the engine starts and is idling. Thanks, JIm

[Skip426]

Going to need a bunch of info on your coach, chassis and engine .
Even if the turbo's waste gate was frozen, you would not have 35 lbs of boost at idle , I suspect a bad " boost pressure sensor " but without info on the engine and gauge type; manual or electronic ; that's an out and out guess.

[wb7auk]

I agree with Skip either a bad pressure sensor or a bad gauge as at idle it is impossible to get 35 psi boost.