Code P0128, how do I fix it?

BOBBYB69

MEMBER
2004 CHEVROLET VENTURE
3.4L
V6
2WD
AUTOMATIC
182,000 MILES

Okay, Y'all, pray all are well. Saturday morning drove it to parts store and back. All good. She takes it to the store and the dang thing starts hesitating on complete stop take off. It is not the stuttering the transmission does, we have that too. I'm going to check vacuum lines and obvious stuff but it threw 4 codes. Attached are them. Which one if any would cause da problem if any?
As always, we appreciate Y'all, BobbyB

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4 Replies

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

Hi Bobby,

One only handle one problem per thread so you will need to make new question of the other four problems, we will handle the p0128 code on this thread which means you need to change the engine cooling thermostat out for a new unit. this guide can help walk you through the job and I have included instructions in the images below for your car.

https://www.2carpros.com/articles/replace-thermostat

Check out the images (below). Please let us know if you need anything else to get the problem fixed.

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Tuesday, May 23rd, 2023 AT 10:05 AM

BOBBYB69

MEMBER
37 POSTS

Okay, cool beans and thanks. Hey Ken L after replacing the fuel injection fuel regulator and clearing the codes. I did a test drive. Still acting up but only one code now. P0300. I am replacing the plugs and wires tomorrow. Will replace the 3 coil packs last if it doesn't get better. Will update you soon. Many Thank X my friend, BobbyB

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Tuesday, May 23rd, 2023 AT 10:33 AM

BOBBYB69

MEMBER
37 POSTS

Hey y'all, sorry for not replying. I still cannot believe it. The ultimate problem was the vacuum hose was broke off of the fuel module (I'm guessing) it goes from there to the fuel regulator. All is working great. Thanks so much.

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Wednesday, June 21st, 2023 AT 12:55 PM

KEN L