OBD Guide
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P1B99

Hybrid/Electric Vehicle Battery 61 Circuit Performance

P1B99 is an OBD-II diagnostic trouble code meaning: Hybrid/Electric Vehicle Battery 61 Circuit Performance. Common causes: poor contact in battery circuit 61, wiring harness damage. Estimated repair cost: $56–278.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–278 (est.)

Symptoms

  • Check Engine light comes on
  • Hybrid system power reduction
  • Deteriorating fuel economy
  • Problems with charging a high-voltage battery
  • Error message on display

Causes

  • Poor contact in battery circuit 61
  • Wiring harness damage
  • Battery voltage sensor fault
  • Battery module problems 61
  • Malfunction of the hybrid power plant control system

How to Fix

  1. Check connections and contacts in battery circuit 61
  2. Inspect the wiring harness for damage
  3. Check voltage and circuit resistance
  4. Test battery voltage sensors
  5. Diagnose battery module 61
  6. Repair only from an authorized dealer (for high-voltage systems)

Related codes

P1B98P1B9AP0A7F

FAQ

What does the P1B99 code mean?

P1B99 is an OBD-II diagnostic trouble code that indicates: Hybrid/Electric Vehicle Battery 61 Circuit Performance

What causes a P1B99 error code?

The most common causes of P1B99 include: Poor contact in battery circuit 61; Wiring harness damage; Battery voltage sensor fault; Battery module problems 61.

How do I fix a P1B99 diagnostic trouble code?

To fix P1B99: Check connections and contacts in battery circuit 61. Inspect the wiring harness for damage. Check voltage and circuit resistance. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1B99?

Limited driving only, diagnose soon

How much does it cost to fix P1B99?

The estimated repair cost for P1B99 is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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