Question about Hummer H3
P0455 is for a evap system large leak detected, and P0422 is main catalyst efficiency below threshold.
Get the cat checked out, this could be the cause of both codes. Failing that a smoke test is your best bet to determine exactly where the evap system is leaking from.
Posted on Oct 21, 2013
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Posted on Jan 02, 2017
A good start would be to go you the Diagnostic Trouble Codes list at http://www.bentleypublishers.com/tech/vw/vw.dtc.table.htm
The DTC's, also known as fault codes, may have other meanings but the list above should point you in the right direction.
Hope this helps - if so a rating would be really appreciated. If is doesn't then "add a comment" instead and I will try to help you further.
Posted on Jul 04, 2008
have a 1999 3.0td trooper. Diesel fuel in coolant and overheating. Suspected problem with head so replaced with new head and gasket set. Timing appears correct.Fuel appears to be flowing. Engine will not start..turns over..no nasty noises...appears to have compression...any ideas please??
Posted on Sep 10, 2009
There is a malfunciton of the Shift Solenoid Valve #1 in your transmission. You need to have the valve removed, tested and possibly replaced.
Posted on Oct 09, 2009
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