yes, and what codes are you asking about "check engine" or anti lock radio codes?
Check fuse and/or relay.
Check Owners Manual
Check the fuse
The best place to find a Chevy Tahoe LTZ would be a Chevy dealership. Or, one could check out a site such as AutoTrader, which would list vehicles for purchase.
Check your fuses.
Check out this site http://www.tommygate.com/
An emission or performance problem will cause the Check Engine Light to illuminate. You can take your vehicle to Auto Zone and have the computer scanned for trouble codes. There is no charge.
A 2005 Chevy Tahoe will take a maximum of 5. 5 quarts of oil. As always, it is best to check the level on the dipstick when changing oil.
Because the coolant is low.
check your owners book
Did you check the fan?
1999 Chevy table oil pressure gauge low and check gauges flickering