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
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..