Pontiac G6 P0128 code


ThxOne

AudioFreak
Jun 8, 2018
2,340
423
Saint Marys, GA
P0128 Coolant temperature below threshold. 3.5L 2008 G6 GT. Automatic Trans. (ECT) Engine Coolant Temp sensor. Located below the throttle body in the head. 3/4" box wrench/short handle works best. Simple replacement. Clear the code manually. If the code comes back, change the thermostat. Remove passenger headlight to gain easier access. 10mm bolts on thermostat housing. Clear code manually. DONE!

Pontiac, Chevy, GM in general. On the Pontiac the most often culprit is the thermostat for the P0128 code.
 
OP
ThxOne

ThxOne

AudioFreak
Jun 8, 2018
2,340
423
Saint Marys, GA
The above post indeed ended up being the thermostat. No more coolant codes.

I just ordered brake rotors and pads for the front of the G6. Cross drilled and slotted with carbon ceramic pads.
 

Popwarhomie

10+ year member
Jan 22, 2010
7,945
1,118
FL
Cross drilled and slotted rotors on a daily driver is pointless. They are more prone to cracking and have less surface area. Only time you need them is when racing and experiencing brake fade from too much heat.
 
OP
ThxOne

ThxOne

AudioFreak
Jun 8, 2018
2,340
423
Saint Marys, GA
Cross drilled and slotted rotors on a daily driver is pointless. They are more prone to cracking and have less surface area. Only time you need them is when racing and experiencing brake fade from too much heat.
I drive hard and fast and I late brake. Nobody delivers pizza like me!!
 
OP
ThxOne

ThxOne

AudioFreak
Jun 8, 2018
2,340
423
Saint Marys, GA
I did my brakes. Cleaned the slides with a wire brush and brake clean then lubricated all the sliding bits. Cleaned off the rotors with the brake parts cleaner, each rotor, both sides twice. Checked all my suspension parts and everything looks great for the mileage. Took the car out and broke in the brakes per manufacturer recommendations then tested braking from 80mph to 50mph to simulate taking an off ramp and no more shaking of the steering wheel. This means my suspicions of a warped rotor were correct.




 

dragon.breath

Senior VIP Member
10+ year member
Nov 22, 2007
613
53
Al
For some people the slotted rotors are the way to go. One of my family members warps rotors on her car in 10k or less. The slotted ones off the net are at 17k with no problems.
 
OP
ThxOne

ThxOne

AudioFreak
Jun 8, 2018
2,340
423
Saint Marys, GA
It rains a lot where I deliver and from previous cars that I have put cross drilled rotors on, I have seen better braking in the rain. I have never got them without slots though.
 

Popwarhomie

10+ year member
Jan 22, 2010
7,945
1,118
FL
Not torquing your lug nuts can cause rotors to warp believe it or not. Looks like you are missing a lug nut.


Dude has some good videos.

 
OP
ThxOne

ThxOne

AudioFreak
Jun 8, 2018
2,340
423
Saint Marys, GA
Not torquing your lug nuts can cause rotors to warp believe it or not. Looks like you are missing a lug nut.


Dude has some good videos.

The stink of it is, I have the stud right in front of me... right now. No clue why I forgot to install it. I am off tomorrow. Might do it then.
 

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