OBD Guide
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P1B73

Hybrid/Electric Vehicle Battery 48 Circuit Low Voltage

P1B73 is an OBD-II diagnostic trouble code meaning: Hybrid/Electric Vehicle Battery 48 Circuit Low Voltage. Common causes: low voltage battery, charger problems. Estimated repair cost: $167–556.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$167–556 (est.)

Symptoms

  • Reduced vehicle power
  • Check Engine Light Illuminates
  • Limitation of hybrid system operation
  • Battery charging problems
  • The car goes into emergency mode

Causes

  • Low voltage battery
  • Charger problems
  • Power transmission circuit malfunction
  • Damage to high voltage cables
  • Battery control unit malfunction

How to Fix

  1. Check the charge level of the high-voltage battery
  2. Diagnose the charger
  3. Check the integrity of high-voltage cables
  4. Check the operation of the battery control unit
  5. Replace faulty components

Related codes

P1B74P1B75P0AA6

FAQ

What does the P1B73 code mean?

P1B73 is an OBD-II diagnostic trouble code that indicates: Hybrid/Electric Vehicle Battery 48 Circuit Low Voltage

What causes a P1B73 error code?

The most common causes of P1B73 include: Low voltage battery; Charger problems; Power transmission circuit malfunction; Damage to high voltage cables.

How do I fix a P1B73 diagnostic trouble code?

To fix P1B73: Check the charge level of the high-voltage battery. Diagnose the charger. Check the integrity of high-voltage cables. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1B73?

Limited driving only, diagnose soon

How much does it cost to fix P1B73?

The estimated repair cost for P1B73 is $167–556. Actual cost depends on your vehicle, location, and labor rates.

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