OBD Guide
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P1B11

Drive Motor Control Module Hybrid/EV AC Voltage System Isolation Lost

P1B11 is an OBD-II diagnostic trouble code meaning: Drive Motor Control Module Hybrid/EV AC Voltage System Isolation Lost. Common causes: damage to high voltage cables, motor fault. Estimated repair cost: $167–556.

Severity
🚨 Critical
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$167–556 (est.)

Symptoms

  • Check Engine light comes on
  • The car may go into emergency mode
  • Reduced power or engine failure
  • Possible problems with battery charging
  • High voltage warning on dashboard

Causes

  • Damage to high voltage cables
  • Motor fault
  • Inverter problems
  • Damage to component insulation
  • Corrosion or moisture in the high voltage system

How to Fix

  1. Check the integrity of high-voltage cables
  2. Diagnose the condition of the electric motor
  3. Check the inverter for faults
  4. Test the insulation of high voltage components
  5. Contact a Hybrid/Electric Specialist

Related codes

P1B12P1B13P0AA6

FAQ

What does the P1B11 code mean?

P1B11 is an OBD-II diagnostic trouble code that indicates: Drive Motor Control Module Hybrid/EV AC Voltage System Isolation Lost

What causes a P1B11 error code?

The most common causes of P1B11 include: Damage to high voltage cables; Motor fault; Inverter problems; Damage to component insulation.

How do I fix a P1B11 diagnostic trouble code?

To fix P1B11: Check the integrity of high-voltage cables. Diagnose the condition of the electric motor. Check the inverter for faults. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1B11?

Do not drive — repair immediately

How much does it cost to fix P1B11?

The estimated repair cost for P1B11 is $167–556. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat