Trouble Code search

[Bill Jones]

I am at a loss trying to find out code B0159 It keeps showing on my 2002 YukonXL 1500 along with another P0440 ; I found a loose hose on that going to Evap Can but it comes back also ..
I cannot find that B0159 anywhere on any list !!!

 

[iamdub]

B0159 is for the outside air temperature sensor circuit. Could be a broken wire, loose plug on the temp sensor or a failed temp sensor.

The P0440 is an EVAP code as you have already found. Make sure your gas cap seal is in good condition and the cap is tight, check all hoses, check operation of the purge valve, etc.