Audi A3 glow plug light flashing and losing power

Hi All! Hoping you can give me some advice. I have a 2011 A3 with 85k on her. This morning the check coolant warning came on but shut off before leaving my driveway and it drove fine to work. On lunch I went to start it up and it started hard then flashed the glow plug light which stayed on. Turned it off and called my husband haha he drove it home and it lost power, cruise control didn't work, brake lights did and still had the warning light on. He ran the codes and it came up with misfires on all four cylinders and the P0651. Any ideas? I read that the break light switch can sometimes cause these symptoms.

Have the battery tested or replace it if it is the original one.

A P0651 will pop up anytime a reference 5V shorts to ground. Reference 5V's are used in any number of sensors in the car, it'd be pretty tough finding the wire that's triggering the code.

I would suggest looking at the wiring around the turbo's boost actuator and DPF as they tend to be subject to more heat stress.

May be the fuse or something...