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For a 2005 trailblazer to reset the oil change light you will need to make sure all doors are closed then turn key on and slowly push gas pedal to floor three times within five seconds, this must be done within 5 sec, from the time you turn key on, the key must be on so all dash light are on its right before the engine start postion, after you push gas pedal to floor three times the light will flash a few times then go out. the system is now reset, if it doesnt reset then repeat steps starting with turning the ignition on, take note engine must be off, not running, have a nice day and i hope this is helpful.
Turn the ignition key to the RUN position.
Fully push and release the accelerator pedal 3 times within 5 seconds. If the
CHANGE OIL SOON light flashes 2 times, the system is reset. However, if the
light comes on and stays on for 5 seconds, the system did not reset. Repeat the
procedure if the system does not reset. This is for a 2001, I couldn't find info for a 2005, also said that a phone call to the dealer should answer it over the fone.
If the service light is on in your TrailBlazer, open the door, turn the key to ignition position and push the accelerator pedal 5 times, the service light will flash. flash your high beams and you're done.
HOW TO RESET THE ENGINE OIL LIFE
SYSTEM The Engine Oil Life System calculates when to change your engine
oil and filter based on vehicle use. Anytime your oil is changed, reset the
system so it can calculate when the next oil change is required. If a situation
occurs where you change your oil prior to a "CHANGE ENGINE OIL" message being
turned on, reset the system.
With the ignition key in "RUN" but the engine off, repeatedly push the
trip/reset button until "OIL" is displayed on the Driver Information Center
Once "OIL" is displayed, push and hold the trip/reset button for five
seconds. The number will disappear and be replaced by 100 (indicating 100% oil
Turn the key to "OFF". If the "CHANGE ENGINE OIL" message comes back on when
you start your vehicle, the engine oil life system has not reset. Repeat the
If this does not work you may have a problem with your instrument cluster.
TURN IGNITION KEY TO ON POSITION THEN BACK TO OFF 3 TIMES 3RD TIME
LEAVE IT IN ON POSITON THEN DEPRESS GAS PETAL TO FLOOR 3 TIMES. TURN
KEY OFF SHOULD BE RESET
On my 2005 impala you turn the ignition on and turn the radio
off. Push down the tune nob until settings is displayed on the radio.
Push the seek button until you see oil life. Push the next button on
the radio until you see the word reset then push the tune nob again.
this will reset the oil timer on the car and change oil light should