2012 chevy traverse 3.6 p0090 and p00c8 codes

Well guys i need some help on this 1.. first i dont have a electric driagram for this 1..
And the description codes said
P0090. Fuel pressure regulator control circuit..
P00c8. Fuel pressure regulator solenoide positive voltage control circuit....
It has a new pressure regulator sensor. And goes on top of the fuel rail.. . I check the wiring. And looks ok
. I got 3 wires.
First is white . Next. Blue next black..
On the white. I got 5v and the blue good ground. On the black is the signal wire .. what should be the signal on and off? The scanner shows 57 fuel pressure .. and manual gauge shows from 55 to 65. Because the niddle is shaking too much.. thank you ..

do you have the sensor unplugged? in the picture it shows fault for an open circuit. you can try using a fused jumper wire and jump the 5 volt ref to the signal wire and check for a change on the scanner showing a different pressure reading. then try jumping the ground and signal wire looking for another change. if you dont see any change id say the signal wire is open since you know the 5 volt and ground are good or a pcm that isnt seeing the chjange

Just going off the code description, I'd say you're looking at a high pressure pump regulating solenoid issue, not a rail pressure sensor issue. The rail pressure sensor reads the same as the low side because the high pressure pump solenoid isn't getting energized. These are rational readings, IMO.

Any complaints of low power? That'd back up a high pressure pump problem.

I couldn't find a diagram for a 2012, but I found one for a 2011. Very likely to be close enough to get the job done:



It's a power side switched driver, so I'd start with some voltage readings at the high pressure pump with the engine idling.

U right tyler.. i went back to the scanner again and the frp is sending signal to the ecm.. so now i will check the high pressure pump and let u know guys thanks.

Guys im back. U know what happen. . The people at the shop unplug the high pressure pump . To make money .. what a people this days.. thank for all the help. Cheryl. And tyler.

Glad to hear it was an easy fix! :silly: Someone unplugged it while they were doing other service/testing?

No they said the pump needs to be replaced . . So the lady was not convence .. and call me so we get the truck out of the shop.. and what it was they unplug the pump .. they want to make easy money 400 for parts and 250 labor ..