OBD Guide
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P1B79

Hybrid/Electric Vehicle Battery 50 Circuit Low Voltage

P1B79 is an OBD-II diagnostic trouble code meaning: Hybrid/Electric Vehicle Battery 50 Circuit Low Voltage. Common causes: hybrid vehicle battery malfunction, problems with the charging system. Estimated repair cost: $167–556.

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

Symptoms

  • Reduced vehicle power
  • Warning messages on the dashboard
  • Problems starting the engine
  • Reduced hybrid system efficiency
  • The car goes into emergency mode

Causes

  • Hybrid vehicle battery malfunction
  • Problems with the charging system
  • Open or damaged electrical circuit
  • Battery controller malfunction
  • Corrosion of contacts or connectors

How to Fix

  1. Check hybrid vehicle battery voltage
  2. Inspect the electrical circuit for damage
  3. Check charging system
  4. Diagnose the battery controller
  5. Replace the battery if necessary

Related codes

P1B78P1B80P0AA6

FAQ

What does the P1B79 code mean?

P1B79 is an OBD-II diagnostic trouble code that indicates: Hybrid/Electric Vehicle Battery 50 Circuit Low Voltage

What causes a P1B79 error code?

The most common causes of P1B79 include: Hybrid vehicle battery malfunction; Problems with the charging system; Open or damaged electrical circuit; Battery controller malfunction.

How do I fix a P1B79 diagnostic trouble code?

To fix P1B79: Check hybrid vehicle battery voltage. Inspect the electrical circuit for damage. Check charging system. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1B79?

Do not drive — repair immediately

How much does it cost to fix P1B79?

The estimated repair cost for P1B79 is $167–556. Actual cost depends on your vehicle, location, and labor rates.

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