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Dr.Automotive, Auto Mechanic
Category: Chevy
Satisfied Customers: 3803
Experience:  Automotive Degree Dealer Experienced
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Chevrolet Trailblazer LT: 08 trailblazer dtc codes CO161,CO131,CO455

Customer Question

08 trailblazer dtc codes CO161,CO131,CO455 traction lights stays on and a wrench light comes and goes the dealer replaced a stop lamp switch problem still there after 178.05
Submitted: 5 years ago.
Category: Chevy
Expert:  Dr.Automotive replied 5 years ago.
Hello and welcome to Justanswer. My name is Danny I am a Automotive Mechanic here to help you with your problem.

Most likely you have a bad connection at C101 you need to remove clean it with a wire brush both the connection and body than reconnect this should clear it up.

Open the harness under the vehicle near the Air Injection Reaction pump relay and inspect for cuts and corrosion. Inspect for loose and backed out terminal in connector C101 along the underhood fuse block. It has 38 terminals if all that doesnt do the trick you will need to Install the latest Electronic Brake Control Module calibration.

Here is a image of C101 number 27 on chassis

Customer: replied 5 years ago.
that was dtc--- co161 co455 co131
Expert:  Dr.Automotive replied 5 years ago.
Thats 100% correct!!