Question about 1998 GMC Envoy

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Code P0452 keeps coming up and the check engin light is on

Also when I push the 4hi or 4 lo it blinks and then nothing

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P0452 is related to the Evaporative Emissions Control system and has nothing to do with the 4WD system.
The P0452 may be something as simple as a loose or bad gas cap.
The 4WD system is somewhat complicated and requires more diagnostics.

Posted on May 10, 2014


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SOURCE: obdII code P0452 Evaporative Emission constro system pressure low

It is not connected to the code. The tranny has a temp sensor for overdrive not to work when tranny is cold

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SOURCE: 2000 gmc yukon xl 4x4 wont engage

see my posting re this at my name: rlf107. $115 in parts and labor solved for me, on a 2000 Yukon XL

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$115 inparts and lobor fixed for me...see my solution posting by clicking on my name.

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SOURCE: have codes p0452 & p0453 tank pressure lo

This sounds like the fuel tank pressure sensor is malfunctioning.It is located on top of the tank by the fuel pump.It looks like a black square that is about 3/4"x3/4".The tank may have to be lowered down to see this.

Posted on Sep 11, 2010

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SOURCE: i have a 2002 gmc sierra 2500 hd and the 4 wheel

It is the buttons. It is about a $50 part new on ebay. Easy to replace. Just pull gently on the dash bezel. I believe there are two screws/bolts. Pull it out and disconnect the wire harness. Then just plug it in and put it back together.

Posted on Jan 20, 2011

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