Traction Battery Fault — Isolation Loss
The Battery Energy Control Module (BECM) detected a loss of electrical isolation between the high-voltage traction battery and vehicle chassis, which may indicate insulation degradation or coolant intrusion.
DO NOT DRIVE with active isolation fault — tow to dealer.
Estimated Cost
$0 – $3,000
Repair Time
2–8 hours (dealer)
DIY Difficulty
Professional Recommended
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.
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.
Authorized Dealerships Near You
Denver Ford & EV Center
Ford Authorized — Mach-E & Lightning Warranty
Denver, CO
More local specialists
Capitol EV Dealership
San Jose, CA · 4.5★
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.