20 Most Recent 2007 GMC Yukon - Page 5 Questions & Answers

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engine lights came on and the codes are po449 and po449p on a 2007 chevy avalanche

if you do not have the code then your only option is thru the dealer

co327 is a code for your transfer case encoder motor and the U codes are communication codes. Most likely cause is the encoder motor needs replacement

Probably light blue, tan, and purple.

You need to check the air pressure in all your tires.

Any interruption in voltage will confuse the computer.