After cleaning the throttle body, RPMs jump to 3,000 after driving for 30 seconds?

FRESH8686

MEMBER
2012 CHEVROLET SILVERADO
5.3L
V8
2WD
AUTOMATIC
241,000 MILES

While still connected, the throttle body was cleaned, and the butterfly was opened manually. After reassembled the RPMs immediately go up to 2,500 and cannot get truck to move. If put in gear it does not engage at all. I included a video. It did go down in the video buy if I drive it after 30 seconds or so the RPMs jumps to 3,000 and the vehicle will not continue to drive, it's like it's in neutral.

Sunday, February 23rd, 2025 AT 2:54 PM

4 Replies

KEN L

MASTER CERTIFIED MECHANIC
54,137 POSTS

Yep, they don't like to be opened manually, we just leave them shut and clean around the bore the best we can or reprogram the throttle body. The truck won't drive because it is in limp mode.

This guide can tell you more:

https://www.2carpros.com/articles/reduced-power-limp-mode

Here are the instructions on how to do the job correctly. Clear the codes before you begin. Check out the images (below). Please let us know what happens.

Images (Click to make bigger)

Was this

answer

helpful?

Yes

No

Monday, February 24th, 2025 AT 1:48 PM

FRESH8686

MEMBER
3 POSTS

So the codes I'm getting for solenoid c in the transmission is because of the limp mode, correct?

Was this

answer

helpful?

Yes

No

Monday, February 24th, 2025 AT 6:45 PM

FRESH8686

MEMBER
3 POSTS

My truck will not go more than a few yards before it completely becomes unresponsive (meaning it feels like I'm in neutral) and doesn't respond to me pushing the gas. I thought you could still drive in limp mode.

Was this

answer

helpful?

Yes

No

Monday, February 24th, 2025 AT 6:47 PM

KEN L