OBD Guide
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P1B05

Drive Motor 1 Control Module High Voltage System Interlock Circuit

P1B05 is an OBD-II diagnostic trouble code meaning: Drive Motor 1 Control Module High Voltage System Interlock Circuit. Common causes: open or short circuit in the interlock circuit, high voltage lockout relay malfunction. Estimated repair cost: $17–89.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • Check Engine light comes on
  • Reduced engine power
  • Limitation of hybrid system operation
  • Possible problems with starting
  • Error message on the dashboard

Causes

  • Open or short circuit in the interlock circuit
  • High voltage lockout relay malfunction
  • Problems with the engine control module
  • Corrosion of contacts in connectors
  • Wiring harness damage

How to Fix

  1. Check the integrity of the locking circuit
  2. Inspect and clean connector contacts
  3. Test the locking relay
  4. Check engine control module
  5. Repair only from an authorized dealer

Related codes

P1B00P1B04P1B06

FAQ

What does the P1B05 code mean?

P1B05 is an OBD-II diagnostic trouble code that indicates: Drive Motor 1 Control Module High Voltage System Interlock Circuit

What causes a P1B05 error code?

The most common causes of P1B05 include: Open or short circuit in the interlock circuit; High voltage lockout relay malfunction; Problems with the engine control module; Corrosion of contacts in connectors.

How do I fix a P1B05 diagnostic trouble code?

To fix P1B05: Check the integrity of the locking circuit. Inspect and clean connector contacts. Test the locking relay. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1B05?

Limited driving only, diagnose soon

How much does it cost to fix P1B05?

The estimated repair cost for P1B05 is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat