Power lift gate stuck in open position

In link below of owners manual starting page 223 fuse box diagram I see two fuses for lift gate, one for module and the other is for logic.
https://cdn.dealereprocess.net/cdn/servicemanuals/chevrolet/2016-equinox.pdf
The link below problem found was switch in side vehicle was turned to off position.
https://chevroletforum.com/forum/tahoe-suburban-25/power-liftgate-stopped-working-36262/

https://www.youtube.com/watch?v=caThwc07PyU

https://www.youtube.com/watch?v=SdQuQyG78SI

https://www.youtube.com/watch?v=KbSAcgAzIZM
On video below it talk about adjustment of latch. If not opening right move latch around and attempt to open liftgate..
You might try closing latch with door open and push button to see latch open up. If it opens fine it could be binding when door is actually closed and latch needs adjusting.
https://www.youtube.com/watch?v=AmPIx4GuEkc

https://www.youtube.com/watch?v=nno-epcZxQc
https://www.youtube.com/watch?v=pBievVsXBLE

I have a 17 Terrain which does not have power lift gate. Something I notice in the video was if you have power lift gates it says to step back when opening and closing because there are sensors to prevent someone from being hit with the door.

Door ajar switch possibly . The lift gate not working is a different matter . Could be any number of thing's .
Power Liftgate System Components
• Liftgate motor assembly
• Liftgate latch
• Liftgate module (LGM)
• Liftgate side upper sensor - left
• Liftgate side upper sensor - right
• Liftgate handle switch
• Liftgate close switch
• GMLAN serial data link
• PWR LIFT GATE 30 amp fuse
• PLG 10 amp mini-fuse

Your best bet take it to a qualified repair shop that has the diagnostic tool that can communicate with the lift gate control module , too check for DTC'S - diagnostic trouble code's .
Liftgate Module
The liftgate module controls the liftgate motor, liftgate clutch, and liftgate latch based on various inputs. The liftgate module also performs diagnostics on these inputs and outputs and will disable liftgate functionality and set DTCs should a fault be detected. The liftgate module is secured to the motor assembly at the left rear of the vehicle. The module requires a liftgate position learn procedure be performed when replacing. This allows the module to learn the full open and full closed positions of the liftgate.

DTC B153A 00: Liftgate Latch Switch Signal Circuit
DTC B153A 08: Liftgate Latch Switch Signal Circuit Signal Invalid
DTC B153B 02: Liftgate Open Switch Signal Circuit Short to Ground
DTC B153B 05: Liftgate Open Switch Signal Circuit Open
DTC B153E 02: Liftgate Position Sensor Signal Circuit Short to Ground
DTC B153E 05: Liftgate Position Sensor Signal Circuit Short to Battery or Open
DTC B153E 08: Liftgate Position Sensor Signal Circuit Signal Invalid

This is not a job for a diy'er or vehicle owner .

liftgate ajar switch , possibly . Without testing that would be just a guess . Do you know how to test automotive electrical circuit's ? Using a wiring diagram an a DVOM -digital volt ohm meter ? Looking at a factory service repair manual to find location of the ajar switch . Also checking for DTC- diagnostic trouble codes ,first !
B2703 Open/Close Switch Stuck Active Power Liftgate Module B2721 Gate Ajar Output Short to Ground or Open Power Liftgate Module REFER to Section 501-03 . B2722 Open/Close Switch Active During Self-Test Power Liftgate Module REFER to Section 501-03 .
B2718 Gate Ajar Output Short to Battery Power Liftgate Module REFER to Section 501-03 .

• The interior lights remain on and the instrument cluster message center indicates liftgate ajar

• Liftgate latch is not in primary position.

• Manually PULL on the liftgate. If liftgate moves, OPEN and CLOSE the liftgate to the primary latch position. Manually PULL on liftgate glass. If liftgate glass moves, OPEN and CLOSE the liftgate glass. If the liftgate ajar condition still exists, Go To Pinpoint Test B .

PINPOINT TEST B: THE POWER LIFTGATE DOES NOT OPERATE/DOES NOT OPERATE CORRECTLY Test Step Result / Action to Take B1 RETRIEVE THE DTCs FROM POWER LIFTGATE MODULE

• Use the recorded power liftgate module DTCs from the continuous and power liftgate module self-tests.
• Are any power liftgate module DTCs recorded?

Yes
If DTC B2552 or B2698, GO to B54 .

If DTC B2699 or B2701, GO to B40 .

If DTC B2700 or B2702, GO to B41 .

If DTC B2703 or 2722, GO to B4 .

If DTC B2704, B2705 or B2706, GO to B31 .

If DTC B2709, B2710, B2711, B2712, B2819, or B2820, GO to B23 .

If DTC B2713, GO to B19 .

If DTC B2714, B2715, B2821 or B2822, GO to B15 .

If DTC B2718 or B2721, GO to B46 .

If DTC B2723, GO to B50 .

If DTC B2724 or B2725, GO to B10 .

If DTC B2726, GO to B35 .

If DTC B2825, GO to Symptom Chart and verify symptom the power liftgate reverses during power close operation (mid-travel). If sent here from the symptom chart, GO to B23 .

If the liftgate unexpectedly reverses direction when ambient temperatures are greater than 32°C (90°F), GO to B23 .

No
GO to B2 .

Power Liftgate
The power liftgate feature will allow the customer to automatically OPEN or CLOSE the liftgate by activating the interior open/close switch, the remote keyless entry transmitter or by manually initiating liftgate movement. The power liftgate uses a power cinch system to latch the liftgate.
The power liftgate system consists of the following:

• Power liftgate control switch (located in the overhead console)
• Power liftgate motors (located in the rear headliner area)
• Optical sensor and power liftgate encoder wheel (located in the left power liftgate motor assembly)
• Pinch strip switches (located on the body by the liftgate)
• Home position switch (located on the cinch actuator)
• Forkbolt switch (located on the cinching latch assembly)
• Detent switch (located on the cinching latch assembly)
• Liftgate close chime module (located in a unit external from the power liftgate module)
• There are a lot of electrical switches an motors
• Visual Inspection Chart Mechanical Electrical
  • Power liftgate motors
  • Power cinching latch and linkage
  • Power liftgate pinch strip switches
  • Liftgate and liftgate hinges
  • Liftgate assist cylinders
  • Liftgate strikers
  • Exterior release handle and linkage
  • Liftgate weatherstrip
  • Liftgate alignment to body and striker
  • Central junction box (CJB) fuse:
    • 5 (7.5A)
    • 105 (30A)
  • Power liftgate control switch
  • Wiring harness
  • Connectors
  Are you willing to take the back hatch apart to test this ,to find a fix . But first have it check for DTC'S - diagnostic troulbe codes '
• Power Liftgate Module Diagnostic Trouble Code (DTC) Index
  Power Liftgate Module Diagnostic Trouble Code (DTC) Index DTC Description Source Action B1342 ECU Is Defective Power Liftgate Module INSTALL a new power liftgate module. REFER to Power Liftgate Module in this section. B2477 Module Configuration Failure Power Liftgate Module REFER to Section 418-01 . B2522 Vbatt1 Circuit Failure Power Liftgate Module Go To Pinpoint Test B . B2552 Vbatt2 Circuit Open Power Liftgate Module Go To Pinpoint Test B . B2698 Vbatt2 Circuit Failure Power Liftgate Module Go To Pinpoint Test B . B2699 Left Pinch Strip Open or Short to Battery Power Liftgate Module Go To Pinpoint Test B . B2700 Right Pinch Strip Open or Short to Battery Power Liftgate Module Go To Pinpoint Test B . B2701 Left Pinch Strip Stuck Active Power Liftgate Module Go To Pinpoint Test B . B2702 Right Pinch Strip Stuck Active Power Liftgate Module Go To Pinpoint Test B . B2703 Open/Close Switch Stuck Active Power Liftgate Module Go To Pinpoint Test B . B2704 Optical Sensor Power Short to Ground Power Liftgate Module Go To Pinpoint Test B . B2705 Optical Sensor 1 Input Not Active During Powered Gate Movement Power Liftgate Module Go To Pinpoint Test B . B2706 Optical Sensor 2 Input Not Active During Powered Gate Movement Power Liftgate Module Go To Pinpoint Test B . B2709 Gate Open Output Short to Battery Power Liftgate Module Go To Pinpoint Test B . B2710 Gate Close Output Short to Battery Power Liftgate Module Go To Pinpoint Test B . B2711 Gate Open Output Short to Ground or Open Power Liftgate Module Go To Pinpoint Test B . B2712 Gate Close Output Short to Ground or Open Power Liftgate Module Go To Pinpoint Test B . B2713 Unlatch Output Short to Ground or Open Power Liftgate Module Go To Pinpoint Test B . B2714 Uncinch Output Short to Ground or Open Power Liftgate Module Go To Pinpoint Test B . B2715 Cinch Output Short to Ground or Open Power Liftgate Module Go To Pinpoint Test B . B2718 Gate Ajar Output Short to Battery Power Liftgate Module Go To Pinpoint Test B . B2721 Gate Ajar Output Short to Ground or Open Power Liftgate Module Go To Pinpoint Test B . B2722 Open/Close Switch Active During Self-Test Power Liftgate Module Go To Pinpoint Test B . B2723 Glass Position Switch Active During Self-Test Power Liftgate Module Go To Pinpoint Test B . B2724 Forkbolt Switch Invalid During Self-Test Power Liftgate Module Go To Pinpoint Test B . B2725 Detent Switch Invalid During Self-Test Power Liftgate Module Go To Pinpoint Test B . B2726 Home Switch Invalid During Self-Test Power Liftgate Module Go To Pinpoint Test B . B2819 Gate Motor Circuit Short to Battery Power Liftgate Module Go To Pinpoint Test B . B2820 Gate Motor Circuit Short to Ground or Open Power Liftgate Module Go To Pinpoint Test B . B2821 Cincher Motor/Unlatch Actuator Short to Ground or Open Power Liftgate Module Go To Pinpoint Test B . B2822 Cincher Motor/Unlatch Actuator Short to Battery Power Liftgate Module Go To Pinpoint Test B . B2825 Movement Ceased Due to Excess Speed Deviation Power Liftgate Module Go To Pinpoint Test B . B2903 Chime Output Circuit Short to Battery Power Liftgate Module/ Liftgate Chime Module Go To Pinpoint Test C . C1935 Chime Circuit Failure Power Liftgate Module/ Liftgate Chime Module Go To Pinpoint Test C . U1950 UBP Communication BUS Fault UBP Communi- cation REFER to Section 418-00 . U2338 Invalid ACM Message Data Power Liftgate Module REFER to Section 418-00 . U2242 Invalid 4WAS Message Data 4WAS Module REFER to Section 308-07A . U2403 Invalid CSM Message Data Vehicle Security Module REFER to Section 418-00 . U2406 Invalid IC Message Data Instrument Cluster Module REFER to Section 413-01 . U2469 Power Liftgate Disabled By Customer Interface Instrument Cluster Module Turn power liftgate on at message center. U2470 Unexpected Keyfob/Keypad Button Press Power Liftgate Module Go To Pinpoint Test A . U2471 Unexpected PRNDL State Power Liftgate Module REFER to Section 419-10 . U2472 Unexpected IGN State Power Liftgate Module REFER to Section 418-00 . U2473 Unexpected Vehicle Speed Instrument Cluster Module/ Powertrain Control Module REFER to Section 413-01 . U2528 PRNDL Data Mismatch Power Liftgate Module/ Instrument Cluster Module Go To Pinpoint Test D .

Maybe your key fob needs a new battery !
Power Liftgate Initialization

NOTE:If the power liftgate system is turned OFF in the message center, the system cannot be activated with any switches or with the liftgate handle. The system will need to be turned ON for any power operation to occur.

NOTE:The power liftgate may not operate under the following conditions:

• a low voltage or dead battery.
• a disconnected battery
• a power liftgate that has been left open for more than six hours.
• a power liftgate that has been manually closed and left ajar.

If any of these conditions has occurred, the power liftgate must be reset.

1. Manually close and fully latch the power liftgate.

1. NOTE:If the power liftgate does not open during this step, refer to the symptom chart to diagnose the power liftgate for no operation.
   Power open the power liftgate by using the keyfob or overhead console switch.

1. Once the power liftgate is fully open, close the power liftgate by using the keyfob or overhead console switch.
   This system can also set DTC'S
2. POWER LIFTGATE MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX (BODY CLOSURES) 501-03 Body Closures 2004 Expedition/Navigator DIAGNOSIS AND TESTING Procedure revision date: 08/23/2004

   Power Liftgate Module Diagnostic Trouble Code (DTC) Index
   

   Power Liftgate Module Diagnostic Trouble Code (DTC) Index
   
   DTC Description Source Action B1342 ECU Is Defective Power Liftgate Module INSTALL a new power liftgate module. REFER to Power Liftgate Modulein this section. B2477 Module Configuration Failure Power Liftgate Module REFER to Section 418-01. B2522 Vbatt1 Circuit Failure Power Liftgate Module GO to Pinpoint Test B. B2552 Vbatt2 Circuit Open Power Liftgate Module GO to Pinpoint Test B. B2698 Vbatt2 Circuit Failure Power Liftgate Module GO to Pinpoint Test B. B2699 Left Pinch Strip Open Or Short To Battery Power Liftgate Module GO to Pinpoint Test B. B2700 Right Pinch Strip Open Or Short To Battery Power Liftgate Module GO to Pinpoint Test B. B2701 Left Pinch Strip Stuck Active Power Liftgate Module GO to Pinpoint Test B. B2702 Right Pinch Strip Stuck Active Power Liftgate Module GO to Pinpoint Test B. B2703 Open/Close Switch Stuck Active Power Liftgate Module GO to Pinpoint Test B. B2704 Optical Sensor Power Short To Ground Power Liftgate Module GO to Pinpoint Test B. B2705 Optical Sensor 1 Input Not Active During Powered Gate Movement Power Liftgate Module GO to Pinpoint Test B. B2706 Optical Sensor 2 Input Not Active During Powered Gate Movement Power Liftgate Module GO to Pinpoint Test B. B2709 Gate Open Output Short To Battery Power Liftgate Module GO to Pinpoint Test B. B2710 Gate Close Output Short To Battery Power Liftgate Module GO to Pinpoint Test B. B2711 Gate Open Output Short To Ground Or Open Power Liftgate Module GO to Pinpoint Test B. B2712 Gate Close Output Short To Ground Or Open Power Liftgate Module GO to Pinpoint Test B. B2713 Unlatch Output Short To Ground Or Open Power Liftgate Module GO to Pinpoint Test B. B2714 Uncinch Output Short To Ground Or Open Power Liftgate Module GO to Pinpoint Test B. B2715 Cinch Output Short To Ground Or Open Power Liftgate Module GO to Pinpoint Test B. B2718 Gate Ajar Output Short To Battery Power Liftgate Module GO to Pinpoint Test B. B2721 Gate Ajar Output Short To Ground Or Open Power Liftgate Module GO to Pinpoint Test B. B2722 Open/Close Switch Active During Self-Test Power Liftgate Module GO to Pinpoint Test B. B2723 Glass Position Switch Active During Self-Test Power Liftgate Module GO to Pinpoint Test B. B2724 Forkbolt Switch Invalid During Self-Test Power Liftgate Module GO to Pinpoint Test B. B2725 Detent Switch Invalid During Self-Test Power Liftgate Module GO to Pinpoint Test B. B2726 Home Switch Invalid During Self-Test Power Liftgate Module GO to Pinpoint Test B. B2819 Gate Motor Circuit Short To Battery Power Liftgate Module GO to Pinpoint Test B. B2820 Gate Motor Circuit Short To Ground Or Open Power Liftgate Module GO to Pinpoint Test B. B2821 Cincher Motor/Unlatch Actuator Short To Ground Or Open Power Liftgate Module GO to Pinpoint Test B. B2822 Cincher Motor/Unlatch Actuator Short To Battery Power Liftgate Module GO to Pinpoint Test B. B2825 Movement Ceased Due To Excess Speed Deviation Power Liftgate Module GO to Pinpoint Test B. B2903 Chime Output Circuit Short To Battery Power Liftgate Module/ Liftgate Chime Module GO to Pinpoint Test C. C1935 Chime Circuit Failure Power Liftgate Module/ Liftgate Chime Module GO to Pinpoint Test C. U1950 UBP Communication BUS Fault UBP Communi cation REFER to Section 418-00. U2338 Invalid ACM Message Data Power Liftgate Module
   

I have a 2008 Suburban with the power liftgate disabled. I have had the power latch stop working, and the BCM report that the rear access open when it is closed (both gate and glass). Somehow the liftgate module thinks the gate is open, so I cannot open the gate at all, and the latch and rear wiper will not work. To reset the control module I pulled the liftgate fuse (#20) in the instrument panel fuse box, turned the car on, off, reinstalled fuse, turned car on, unlocked doors using drivers side switch, and the power latch will function again - at least for a while.

It can be faulty switch or its issue with lift gate latch.Its got stuck up hard or cracked inside.It has to be inspected.-----------
There are few help links with proper solutions for these problem.I suggest you to refer the links.
Click the link below:----
2007 Mercury Mountaineer: Liftgate will not Unlock or Open? http://whoisbyme.blogspot.in/2012/06/2007-mercury-mountaineer-liftgate-will.html
------------
Adjust Hydraulic Lifters? http://schematicsdiagram.blogspot.in/2012/04/adjust-hydraulic-lifters.html
-----------
How to open rear lift gate? http://repairhelpcenter.blogspot.com/2011/12/how-to-open-rear-lift-gate.html

--------- Power Liftgate Shuts Down http://whoisbyme.blogspot.in/2012/07/power-liftgate-shuts-down.html
------------ Power Lift Gate Will Not Remain Open http://whoisbyme.blogspot.in/2012/07/power-lift-gate-will-not-remain-open.html
----------- Power Lift-gate will not Operate http://whoisbyme.blogspot.in/2012/07/power-lift-gate-will-not-operate.html
------------- Liftgate will Not Stay Up Open? http://whoisbyme.blogspot.in/2012/07/liftgate-will-not-stay-up-open.html

---------------- Rear Door will not open http://whoisbyme.blogspot.in/2012/07/rear-door-will-not-open.html
------------ 2000 Toyota Corolla: Rear Door wont open from outside or inside? http://whatisbyme.blogspot.in/2012/05/2000-toyota-corolla-rear-door-wont-open.html

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These details will help.
Thanks.

{: ) Your liftgate struts (shocks) could have gone weak. If it's a power liftgate, press the off button to disable the power liftgate function, so that you can open the liftgate manually. With a little help from you, extend the liftgate at full open position and check if it will hold itself up there as it normally should. If it starts to fall off as you catch it, that means the liftgate struts don't have enough pressure anymore to push and sustain the weight of the liftgate. Check for signs of leak on the struts, or better if you can replace it both.

Check all the fuses under the hood and under the dash. Then try having someone wiggle the liftgate while you "tap" the down button repeatedly. Do not apply too much force to the liftgate.