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VCFRONT_a192: Car will not drive (also with UMC_a012 and CP_a057)

designrs

Member
Jun 24, 2020
218
214
Jacksonville, FL
Had the car for one year and appx 7,200 miles. No problems.

Car was charging in the garage overnight. In the morning car would not shift into drive.

Primary error code: VCFRONT_a192 (power reduced)
Secondary error codes UMC_a012 (charging equipment) and CP_a05 (charging equipment)

Power Cycled the car: Controls > Safety & Security > Power Off
Also did the Touch Screen Reset with the two scroll buttons on the steering wheel.
Neither had any positive effect.

Tesla Roadside assistance arrived. Hooked up jumper battery.
No change whatsoever.

Towed to Tesla Service. Loaner car provided.

Will update report as known. (Memorial Day Weekend)
 

designrs

Member
Jun 24, 2020
218
214
Jacksonville, FL
Update: Car was in service 12 days including the Memorial Day holiday weekend. Free tow. Free loaner car (Model 3).

The service staff kept talking about a blown fuse (a large one) that had to be ordered. Then communications with Tesla engineers as “alerts related to vehicle shutdown are still present”. AC unit ordered.

Final invoice says: replaced the 12V battery, power conversion ASY, heater PTC, AC PTC service.

(Vehicle Stats: 2020 Model 3 SR+, appx. one year from delivery, 7,400 miles. Florida car. AC use, garaged. Mostly all home charging on Level 1 with some Level 2. Supercharged only about 12 times.)
 
Last edited:

cali8484

Member
Jul 8, 2018
237
139
California
Update: Car was in service 12 days including the Memorial Day holiday weekend. Free tow. Free loaner car (Model 3).

The service staff kept talking about a blown fuse (a large one) that had to be ordered. Then communications with Tesla engineers as “alerts related to vehicle shutdown are still present”. AC unit ordered.

Final invoice says: replaced the 12V battery, power conversion ASY, heater PTC, AC PTC service.

(Vehicle Stats: 2020 Model 3 SR+, appx. one year from delivery, 7,400 miles. Florida car. AC use, garaged. Mostly all home charging on Level 1 with some Level 2. Supercharged only about 12 times.)

It's probably the pyro fuse. A bit surprised they had to replace more than the fuse especially the heater.
 

designrs

Member
Jun 24, 2020
218
214
Jacksonville, FL
UPDATE: Upon driving on the highway, just minutes after picking the car up from Tesla, I got DIR_a126 “Power Reduced”

Returned to Tesla: They said it was the coolant that needed to be purged after installing the new battery heater equipment, and sevived.

Took the Car Home: It refused AC charging PCS_a_078 “Vehicle Systems Over Vehicle Limit”. Got it to take DC Supercharging though.

Driving Back to to Tesla: DIR_a126 “Power Reduced”… again.

Service loaner provided (older Model S)

Getting concerned. 🙄
 

designrs

Member
Jun 24, 2020
218
214
Jacksonville, FL
It sees like the coolant system was not properly setup after replacing parts.

My primary concern (besides fixing the car) is being sure that the battery was not over temperature reducing useful life. Does anyone know if the “reduced power warning“ and not accepting AC charge due to “vehicle systems over temperature“ adequately protect the car and useful life?
 

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