car randomly stalls for no reason?

2010 VOLKSWAGEN GOLF

135,685 MILES • 2.0L • 4 CYL • 2WD • MANUAL

CHRIST CHEN

MEMBER
36 POSTS
FOLLOW

I own a the vehicle listed above Canadian city manufactured in Brazil in August 2009.
My problem is that the car randomly stalls for no reason.
when it does, all these codes come on at once...
p0031, h02s heater control circuit low(b1,s1).
p0037, h02s heater control circuit low(b1,s2).
p1541, fuel pump relay(j17) open circuit.
p1435, secondary air pump relay(j299) short to ground.
p2401, evap detection circuit low.
p0261, p0264, p0267, p027), cylinder injector circuit low.
p0102 mass air flow circuit low input.
p0103 mass air flow circuit high input.
What could cause this?????
There are no loose, corroded, or broken wire(s).
Can it be water in my gas tank???

Thank you,
Christian

Feb 2, 2024 at 10:21 AM

STRAILER

CERTIFIED EXPERT
53,854 POSTS

You have many codes which can be caused by the root problem, the code that sticks out for me is the:

p1541, fuel pump relay(j17) open circuit.

This is telling us the fuel pump and/or relay is going bad. I would clear the codes and replace the relay and fuel pump here is how the job is done for the fuel pump and the location of the FP relay.

This guide can help as well:

https://www.2carpros.com/articles/engine-stalls

Check out the images (below). Please upload pictures or videos in your response to the problem so we can see what's going on.

Images (Click to enlarge)

Feb 2, 2024 at 11:15 AM

CHRIST CHEN

MEMBER
36 POSTS

When i pinch/push on the fuel pump relay the car stall, it seems to come from inside the relay power/connector block. i will disassemble it and look inside, I'll let you know my findings.

Video (Click to enlarge)

Feb 7, 2024 at 10:42 AM

STRAILER

CERTIFIED EXPERT
53,854 POSTS

Good find, the wiggle test helps find electrical problems. thanks for the video. I have seen the fuse panel and with all of those codes is likely there is a problem. Check out the images (below). Please upload pictures or videos in your response to the problem so we can see what's going on.

Images (Click to enlarge)

Feb 8, 2024 at 9:36 AM

CHRIST CHEN

MEMBER
36 POSTS

Good day Ken,

Your pics don't really help since my car is a 2l engine and Canadian market car only.
And for that, all set up as wiring, fuses box and relay carrier are very different.
That said, I already disassembled the relay carrier and opened it, all i found is a few loose connections, pinched them close and put it back together but it still stalls when i push on the fuel pump relay.
I will have to find a new one and try the test again and see.
Christ

Feb 8, 2024 at 10:08 AM

STRAILER

CERTIFIED EXPERT
53,854 POSTS

Yep, that sounds like the problem.

Feb 9, 2024 at 9:08 AM

CHRIST CHEN

MEMBER
36 POSTS

Hopefully problem solved. i found a relay at the wreck yard, no stalling when i pinch the relay. so, we'll see in a few km how it goes. Thanks Ken.

Video (Click to enlarge)

Feb 11, 2024 at 6:19 AM

STRAILER

CERTIFIED EXPERT
53,854 POSTS

Thanks for the video, I'm glad you could get it fixed, thanks for letting us know. Please use 2CarPros anytime we are here to help.

Feb 11, 2024 at 11:15 AM

CHRIST CHEN

MEMBER
36 POSTS

Hi Ken,

Another question for you.
As i checked a few things, I noticed that there is oil,ice and a gas smell in my PCV, which is electric tube and valve (2010 Golf City, 2.0l).
What would cause this?

Christian

Image (Click to enlarge)

Feb 18, 2024 at 10:16 AM

CHRIST CHEN

MEMBER
36 POSTS

From what i could read on the internet, it is called "heated PCV valve" and it is permanent on the intake tube, on the valve there is a small vacuum tube connected to the throttle body to close the valve at idle and open it as the RPMs rise. The thing is that i don't know how to check if the heater works or even has power to it and if the vacuum hose closes and opens the valve to let crankcase vapor in the intake.
Any leads to guide me on the right way to do it?

Image (Click to enlarge)

Feb 18, 2024 at 6:58 PM

STRAILER

CERTIFIED EXPERT
53,854 POSTS

Sorry, we only handle one problem per thread, please post your new question here, you must be logged in.

https://www.2carpros.com/questions/new

Cheers, Ken

Feb 19, 2024 at 8:44 AM