What to do since my service tire monitor has come on in my 2005 chevy suburban z71

36mm

2002 Chevrolet Suburban 1500 - Spindle And Axle Nuts

O'Reilly Auto Parts https://www.oreillyauto.com > cv--driveshaft---axle
Thread Size: M24-2.0 ; Hex Size (mm): 36mm.

Torque

https://www.google.com/search?q=2002+Chevy+Suburban+Z71.+axle+nut+torque

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All the torque specs can be found using Google. Just change the words in the search query and press Enter.

Wheel hub

https://www.google.com/search?q=2003+Chevy+Suburban+Z71+wheel+hub+torque+specs

Or get a copy of the Repair Manual for $16

https://www.google.com/search?q=2003+chevy+suburban+z71+repair+manual

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http://engine-codes.com/p1125_chevrolet.html
According to that website above, its your Accelerator Position Pedal Sensor. If you have already replaced it check your wiring harness.
Here is a website that for your wiring diagram for your 2005 Chevy Suburban.

could be electronic soleniod for 2-3 shift. have trans shop hook up scanner to check

two knock sensors.under phlemm assy. replace cover gasket, two sensors and wire harness.

same thing happens to my 1996 chevy z71.. it just happens because of the age...newer cars use censors so spashing doesnt cause the bobber in the tank to move up and down..

UNDER DASH ON PASSENGER SIDE YOU WILL FIND YOUR BLOWER RESISTOR MODULE IT IS MOST LIKELY BAD I SEE ALOT OF THIS PROBLEM IM MY SHOP MAJORITY ENDS UP BEING THIS

how do i remove back brake shoes on a 2005 chevy z71

Depends on how long he was trying to program the TPMS. With the engine not running and the ignition keys on, the day time running lights are on and the head lights are draining the battery. Next time your going to have the ignition keys on for a long period of time with out the engine running, set your parking brakes. Setting your parking brakes will keep your Day time running lights from coming on.

Fuel filter plugged.