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Old 05-21-2019, 09:46 PM   #1
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Join Date: May 2019
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Default EPC Light - any guidence

Hello - I am new here (first post) and am looking for some guidance.

About a month ago when driving home from work in my 2014 Jetta (42,000 miles approx) my EPC light came on. I'd owned the car for about 24 months at that point (bought it used with 25,000 miles on it) and had almost no issues.

Got home and googled EPC light and saw that it was likely an issue with my throttle system and to bring it to a dealership immediately.

I brought it to a dealer the next morning as soon as they opened at 6a. They ran a battery of tests and told me they saw no issue with my throttle system or anything similar that the EPC light would be tied to.

Since that day about a month ago - by EPC light continues to come on sporadically. I basically drive to work (about 18 miles, all on interstate) and back home and not much else. Took it on one road trip about 200 miles each way one weekend and saw no issues. A couple weekends later, about 250 miles each way and the EPC light came on both days.

I do seem to notice that the performance of the vehicle is worse when the light is illuminated, but it's also possible i'm imagining it because the light is on.

When it comes on, it stays on until I finish driving the car for a considerable amount of time. Simply turning the car off and turning it back on doesn't do the trick. Or, for instance, half an hour in the grocery store - it'll still be on when I get back.

But overnight or during the work day, it won't be on when I get back.

Does anyone have any thoughts or suggestions about what my next move should be?

Best,
Plinko
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Old 05-22-2019, 07:28 PM   #2
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Join Date: Jun 2016
Posts: 160
Default

The dealer should be able to hook up their diagnotstic tool to see what
caused it (VCDS,VAG-COM). They're stupid of they can't tell you why it
came on, they have the tools to diagnose the system.


If the plugs are worn, and the timing can't advance, the EPC light would
come on. It's not limited to the drive-by-wire system.


If the brake switch is bad, the EPC light will come on.



If the transmission can't handle the engine's torque output, or there is a
problem with shifting under load, the EPC light can come on.



If you had paddle shifters, and they malfunctioned, the EPC light would
come on.




It also indicates any faults with the traction control, throttle pedal, cruise
control, and throttle body.




I had a boost module, with the factory gap, and the EPC light would come
on if I went floored it. Once I regaped the spark plugs, that went away.
Then if Iused 87 octane fule and floored it, it would also come on. It
always reset whenI turned the car off and on again.


Wow, this editor sucks. No matter how I format it, it is over spaced,
double spaced... This is the only forum this is happening... I have
to preview my post THREE times to get the spacing right...


See how this is over spaced? Does not look that that while editing.
I single spaced between each paragraph, and it ends up double or
triple spaced on the preview and submission..
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