Error p0121 Throtle pedal sensor.

[lsv_palana]

Dear friends. I have p0121 error. Who knows what i have to change to eliminate it ?

 

[amrg]

P0121 - throttle position sensor?

Its the sensor in the throttle body (the part the intake pipe goes into).
You need to remove the throttle body and disassemble the sensor and replace it. Easy job.
Will need to do a throttle body relearn afterwards which will need an OBD-2 device (if you don't do that you may have big driveability issues)

This is the part I replaced when I had the problem.

http://www.rockauto.com/en/moreinfo.php?pk=3944205&cc=1442832&jnid=422&jpid=0

 

[lsv_palana]

Thank you dear friend. I have this new black box.
Also i have obd2 adapter that connected to my phone via bluetooth..or you mean tech2 or something else ?

 

[amrg]

Thank you dear friend. I have this new black box.
Also i have obd2 adapter that connected to my phone via bluetooth..or you mean tech2 or something else ?

Yes Tech 2.
I have Hp tuners software and it does it. So its not limited to just Tech 2

 

[lsv_palana]

My friend have Tech2 but hi not skilled much in it. Can you give step by step instruction how to do this.. we have no hummer dealers here...

 

[lsv_palana]

Also i need to buy my own thing that can work like tech2. Can you give me clue where i can buy all i need for that ?

 

[amrg]

I don't no how to use a Tech2 so I can't help on that.
The software I used was Hptuners. Its main thing is to let you program the engine/trans for whatever you want (more power/fuel economy, etc). I used it to let a tuning company tune my car (I download truck settings, send them by email, they tweak them and send them back).

http://www.hptuners.com/order.php

But you don't need all of this...

 

[lsv_palana]

thank you so much. Is there a way to relearn throttle sensor witout obd2 ?

 

[amrg]

With the South African Hummer H3 Alpha only using obd2.

If you don't do a relearn, the pcm will not know how much the throttle blade is open/closed.
In my case the truck was idling at 3000 rpm which was horrible when you want to stop.

 

[lsv_palana]

I have v8 5.3 lh8 ... seems to be alpha...

 

[lsv_palana]

Here is it: