2004 Chevy Trailblazer 4.L inline 6 cyl Codes p0455.
What should i be looking for when code p0455 comes up....evaporative emission control  system leak detected (gross leak)
Answer:
Code
p0455 is a large EVAP leak.
A common cause for this is a loose or faulty gas cap. Or if the truck was running when you were filling it with gas, this can also cause this code.

Another common cause is a faulty / sticking EVAP vent solenoid / valve. If the vent  valve does not operate, the system will not seal when it needs to, thus causing a large leak. A simple test with a test light and a scanner that can turn the vent solenoid on and off would need to be done to test the valve.
Problem with my 2002 Chevy Trailblazer
New times put on within 2,000 miles. Car inspected December.
Question: DRIVING AT 45 MPH AND ABOVE I HEAR A HIGH PITCH HUM FROM REAR PASSENGER WHEEL. THERE ARE NO VIBRATIONS WHATSOEVER. VEHICLE RECENTLY PASSED INSPECTION 12/09.
Answer:
Answer: Try popping it into neutral as the noise is occurring. Be sure to let off the gas.
This will tell you if it is related to vehicle speed, or engine speed. If the noise continues the same, you may have a noisy bearing in the rear differential. If the sound changes, then it is an engine frequency noise. Possibly exhaust heat shield, exhaust hitting frame, rear end housing or suspension component.


The evaporative emission (EVAP) control system limits the fuel vapors from escaping into the atmosphere. The EVAP transfers the fuel vapors from the sealed fuel tank to an activated carbon storage device, the EVAP canister. The EVAP canister stores the vapors until the engine is able to use the extra fuel vapor. When the engine is able to use the extra fuel vapor, the intake air flow purges the fuel vapor from the carbon element and then the normal combustion process consumes the fuel vapor. The system is required in order to detect the evaporative fuel system leaks as small as 0.040 inch between the fuel filler cap and the EVAP canister purge valve
2002  Chevy Trailblazer.
Question: My 2002 trailblazer is having electrical issues. The hatch and window is locked closed, the remote doesn't work and the radio doesn't stay on after the car is turned off.
Answer: There is a computer located in the tailgate, called the Liftgate Module. These are known to go bad and cause the issues you describe. If the tailgate is locked and you can't open it, you will have to try to remove the trim panel from the inside and then manually unlatch the tailgate lock. You should have the vehicle checked for any trouble codes and if there is communication with the Liftgate Module. If it is needed to be replace, it will have to be programmed at a dealership to be fully functional. Be sure to check all fuses, including the fuse box underneath the left rear seat. Your remotes will have to be reprogrammed as well. You may also want to try disconnecting the battery for about 10 minutes and see if that helps too.
2004 Chevy Trailblazer P0455- EVAP Large Leak

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