Where is the shift lock overide reease button on

Page 95 (Section 2-26) refers. It is hidden!

Shift Lock Release This vehicle is equipped with a shift lock release system. If your vehicle has a dead battery and you need to have your vehicle towed, there is a shift lock release lever that will allow you to move the shift lever out of PARK (P). To access the shift lock release lever, do the following:
1. Press on the sides of the boot around the shift lever to release the boot.
2. Lift up the boot on the shift lever and you will see an orange lever.
3. Press the orange lever down and move the shift lever out of PARK (P).
4. Snap the shift lever boot back in place.

https://my.gm.com/content/dam/gmownercenter/gmna/dynamic/manuals/2002/gmc/envoy/2002_gmc_envoy_owners.pdf

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nuetral safety switch has issues or the button is not depressed at the brake lever--if u go under and look it can be seen and felt--press it in to start car

2002 envoy shift relase override locastion

if parking brake is released
ther would be a build up of rust between shoes and internal drum edged
try to back up internal shoes and chip away rusted edged then they should come off

there should be a shift lock overide button on the shifter look in owners manuel. just push button in and shift
make sure brake lights work most cars wont shift out of park unless brake is on. they use the brake light switch for this though some have a seperate switch on the brake pedal
check ALL fuses under dash and under hood replace any that are bad

Your shift inter-lock servo is bad (Dealer only)

there is a shift solenoid connected to the brake pedal circuit to release the shifter.it is the click you hear when stepping on the brake.otherwise it stays in park.
the manual overide will let you put it in gear.

IF IT IS A REAR BRAKE LOCKING UP WHEN BRAKES ARE COLD IT COULD BE A LEAKING REAR SEAL. MY 98 SAVANA 3500 HAS HAD 3 REAR SEALS REPLACED AND BRAKES BECAUSE THEY GET CONTAMINATED AND STICK WHEN COLD. I WAS TOLD THAT GMC'S OF THIS TIME PERIOD ARE FAMOUS FOR THE PROBLEM......

the shift interlock solenoid is probably bad

you probably got no brake light in the back if no brake light that mean no power to brake switch that why you have to use the overide button check the fuses to make sure you put it at the right place or burn fuses also at the brake light switch broken wire hope this help fixya our post thanks pierre