P2635, P018B, P018C.. 2016 Limited LS 2.5

vman · Mar 2, 2023

P2635, P018B, P018C
I have these codes in my 2016 Malibu Limited 2.5 with 75000 miles on it.
The car appears to be running fine.
I see in a previous post that a fuel rail pressure sensor was the issue. I believe there are two fuel pressure sensors?
Part numbers.... 13516496 and 12627092. Can someone say which sensor was the issue and where it is located?
I also see this video describing trouble-shooting these codes in a 2014LS2.5. Tech finds a broken wire at about 44 minutes in. Tech worked diligently to snoop out the wire!

Thanks for any input.

Previous thread discussing P2635....

Turboleg said:
Update: it's fixed

Condensed view of Symptoms: P2635, rough/unstable idle, occasional hesitation coming off idle, auto start/stop fails to stay in the stop mode (goes directly to off at operating temp), poor fuel economy, although the engine has not overheated the engine seems to heat up ridiculously fast (this is certainly subjective but compared to others I've worked on this was noticeable to me), plugs 1 and 3 showed signs of ash while 2 and 4 appeared "normal", fuel pump pressure running around 90+ psi at idle while DI rail pressure ran 450ish at low idle.

The final fix: replace Fuel Rail Pressure Sensor, clear DTCs, and reset fuel trims

Owner feels the car picked up considerable torque and we'll be looking for an improvement in fuel economy now that she's being fueled properly.

Thanks everyone for the help.

vman · Mar 27, 2023

Fault was as described in the youtube video. A slight pinch on the harness by the parking brake cable broke a wire inside the wrap.
It would have been very hard to find without the help of the video. The pinch point is hard to see. Mud shield and parking brake cable
need to be bent a bit to see it.
Glad the technician took the time to post his excellent trouble shooting.
.

P2635, P018B, P018C.. 2016 Limited LS 2.5

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