shaking at Idle

[corbin.21]

Its a 2014 jetta Manual with 146k miles on it. Regular oil changes at most 10k miles apart. Clutch was replaced at 143k. I do have a check engine light on. I don't know the code but I'm told its for a bad thermostat sensor.

It will shake while at idle randomly. For instance there was no shake at any point today. Yesterday, however, at every stoplight it would shake uncontrollably. The only way to stop it is to turn the car off and back on again. There is no shake or grind under load at any point. I don't think its clutch related but I don't know jack squat.

Any insight on this?

Thank all!

 

[super1]

Its a 2014 jetta Manual with 146k miles on it. Regular oil changes at most 10k miles apart. Clutch was replaced at 143k. I do have a check engine light on. I don't know the code but I'm told its for a bad thermostat sensor.

It will shake while at idle randomly. For instance there was no shake at any point today. Yesterday, however, at every stoplight it would shake uncontrollably. The only way to stop it is to turn the car off and back on again. There is no shake or grind under load at any point. I don't think its clutch related but I don't know jack squat.

Any insight on this?

Thank all!

How long ago did you get that code scanned ? Might need to get it rescanned to see if any new ones showed up
Any other symptoms? Low power or anything?

 

[corbin.21]

How long ago did you get that code scanned ? Might need to get it rescanned to see if any new ones showed up
Any other symptoms? Low power or anything?

That was scanned in early February. I have no power loss or any other symptoms. I'll scan it again tomorrow and see if there's anything new.

 

[super1]

That was scanned in early February. I have no power loss or any other symptoms. I'll scan it again tomorrow and see if there's anything new.

VCDS is best

 

[KERMA]

possibly related to regen
The ecu adjusts each individual cylinder torque and timing according to the cylinder pressure sensors signal. During the regen operating modes, the adjustment tolerance is less forgiving at certain rpm/load ranges (can't compensate as much, or switched off). So you could be looking at a failing cylinder pressure sensor, or possibly a sketchy injector or two.
This is similar to what causes the so-called "DMF" shudder in some tuned cars.

You can watch this in VCDS at MVB 104, watch the state bit change from bit 0 (non regen) to other bits, indicating some aftertreatment mode. Or if you have Polar FIS, it's "DPF st" changing from "1" to "2" or "4" or "10" or "20"

 

[oilhammer]

OBD works, I'd start there. Usually the cylinder pressure sensors data will flag a DTC pretty quickly if something is off like that. But you'd not know if your MIL is already on (and.... why not fix that if you already knew about something possibly thermostat-related?)