I have a 2008 chevy trailblazer and in the morning i get 2 lights go on my traction light and my service traction light , the dealer says to replace my steering positioning sensor but i dont have faith in that the code is dtc c0455 , when i shut off the ignition then back on it doesnt come back on

SOURCE: service vehicle soon light

hi,
olds aleros and pontiacs have qwerks like those, I had a 97 grand prix that was quite qwerky. We went through the mill to get the service light out, it was the spark plug wires, plugs and dirty injectors to get that light out, its the exhaust mixture sensor sensing an incomplete burn that turns that light on, may be others but that one for sure. probably have a sensor loose, dirty, busted or grounded at one of the wheels for the abs, fix that and the trac button will probably start working again. hang onto the olds if you can , it will be worth money someday.

good luck

J

SOURCE: code c1277 (steering angle sensor)

this vehicle uses a steering control module and the antilock control module. Both modules get a signal from the steering angle sensor. We found that the steering module didnot show a steering sensor code but the ABS module did show the code.
after checking that the wiring was intact and with good continuity, it was determined that the fault lies in the ABS module.
A new ABS module and configuration confirmed the diagnosis. It's fixed!

SOURCE: 2002 Chevy Trailblazer Engine Codes

This is actually an easy swap out. Remove the electrical connection, remove the retaining bolt and pull out old one. I believe the sensor is located in the front passenger side of the engine on this particular model.

SOURCE: 2002 chevy trailblazer has rough idle

it could be an o2 sensor. it could also just need a tune up

SOURCE: The "engine power is reduced" light comes on

po455 is Probable Cause[s]

1. Defective, loose or missing fuel cap
2. EVAP canister broke, hose cracked or not connected
3. Purge or vent solenoid defective
4 . Vacuum leak at engine po121 code po121 means Throttle Position Sensor/Switch A Circuit Range/Performance Problem . it is usually indicative of a faulty throttle position sensor or faulty wiring harness in the engine bay.