Drive Motor Control Module Lost Communication
The main network hub lost all communication with the drive motor inverter across the CAN bus line. Without vital speed and power management data, the vehicle enters a disabled or non-operational state.
Estimated Cost
$650
Repair Time
2-4 hours
Difficulty
Shop Recommended
Can I Fix This Myself?
DIY-Friendly Repair
Many owners resolve this with basic tools at home.
Tools you'll need:
Follow the step-by-step wizard below. If the issue persists after working through all steps, it's time to schedule a professional service appointment.
Step-by-Step Fix Instructions
- 1
Test the 12V accessory battery voltage with a multimeter.
- 2
Clean corrosion from 12V terminals and tighten grounding strap bolts.
- 3
Disconnect 12V battery for 15 minutes to force a hard reset across all controllers.
- 4
Trace main wiring looms for rubbed or chewed wires.
- 5
Test CAN high and CAN low signal voltages with a digital oscilloscope.
- 6
Replace or re-flash firmware on the malfunctioning drive motor control module.
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.
VoltVitals Recommended Specialists in Your Area
Queen City EV Repair
Tesla Model 3/Y, Hyundai IONIQ 5, Kia EV6, Multi-Brand EV Service
Cincinnati, OH
More local specialists
Cincinnati EV Specialists
West Chester, OH · 4.7★
Step-by-Step Diagnostic Wizard
Answer each question to narrow down the root cause of your U0100 fault.
Check 12V Auxiliary Battery
Step 1 of ~7
Measure the 12V auxiliary battery voltage with a multimeter. The 12V battery is in the front compartment on the Bolt EV. A weak 12V battery is the most common cause of U0100 in EVs.
Is the 12V battery voltage above 12.4 V (engine off)?
Need hands-on help?
Find a verified EV mechanic or dealership near you.