Ford High Voltage System Emergency Shutdown
The primary control module triggered an emergency isolation of the high-voltage electrical network to minimize arc risks. This hard fault typically stems from a breakdown or bad safety contactors inside the main battery distribution hardware.
DO NOT DRIVE with active isolation fault — tow to dealer.
Estimated Cost
$950
Repair Time
Dealer visit required
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
Park safely and pull the low-voltage emergency service disconnect loop under the front hood.
- 2
Inspect disconnect pins for damage and reseat firmly.
- 3
Connect scan tool to read powertrain sub-modules and clear stored codes.
- 4
Tow to a qualified service center with high-voltage platform hoists.
- 5
Lower the main HV battery casing from chassis mounts.
- 6
Replace faulty High-Voltage Battery Junction Box (HVBJB) relays and electrical bus bars.
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 P1A10 fault.
Check Vehicle Operability
Step 1 of ~7
Attempt to power on the vehicle. Note whether it enters Ready mode and if any High Voltage warnings are displayed.
Does the vehicle power on and enter Ready mode (no HV warnings)?
Need hands-on help?
Find a verified EV mechanic or dealership near you.