Tesla Charge Port Power Conversion Failure
The Battery Management System has lost its high-voltage connection to the vehicle's onboard Power Conversion System (PCS). This safety-critical hardware error prevents the vehicle from accepting any AC home charging or managing DC fast-charging sessions safely.
High-voltage system — do not open battery enclosure.
Estimated Cost
$1,850
Repair Time
3-4 hours
Difficulty
Dealer Only
Can I Fix This Myself?
Professional Service Recommended
This repair involves high-voltage components or specialized equipment.
What professionals will use:
Use the diagnostic wizard below to gather information for your mechanic, then find a local EV specialist using the ad below.
Step-by-Step Fix Instructions
- 1
Scroll-wheel reset on steering wheel to check for software lock.
- 2
Check logic harness pins under rear seat for moisture or looseness.
- 3
Schedule service for factory-level HVC diagnostics.
- 4
Isolate HV battery pack and remove ancillary bay cover plates with insulated tooling.
- 5
Drain PCS coolant loop and disconnect AC/DC bus bar junctions.
- 6
Replace Power Conversion System (PCS) assembly and perform vacuum leak test before refilling coolant.
Check Your Warranty Before Paying
Federal law requires EV battery warranty coverage for 8 years / 100,000 miles minimum. Many manufacturers offer 10-year coverage. An authorized dealership can confirm coverage for your VIN at no charge.
Step-by-Step Diagnostic Wizard
Answer each question to narrow down the root cause of your BMS_a063 fault.
Check Touchscreen Warning
Step 1 of ~6
Open the Tesla app or look at the instrument panel. Note any battery-related warnings (yellow or red).
Is a battery warning or reduced-range notification visible on the touchscreen?
Need hands-on help?
Find a verified EV mechanic or dealership near you.