OBD Guide
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P1B91

Hybrid/Electric Vehicle Battery 58 Circuit Low Voltage

P1B91 is an OBD-II diagnostic trouble code meaning: Hybrid/Electric Vehicle Battery 58 Circuit Low Voltage. Common causes: low voltage battery, problems with battery connections. Estimated repair cost: $167–1111.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$167–1111 (est.)

Symptoms

  • Check Engine light comes on
  • Reduced vehicle power
  • The car goes into emergency mode
  • Reducing electric range
  • Battery charging problems

Causes

  • Low voltage battery
  • Problems with battery connections
  • Battery management system (BMS) malfunction
  • Damage to high voltage cables
  • Battery cell degradation

How to Fix

  1. Check the charge level of the high-voltage battery
  2. Inspect the battery connections and connectors
  3. Check the condition of high-voltage cables
  4. Scan the battery management system (BMS) for errors
  5. Conduct battery cell diagnostics
  6. Repair only from an authorized dealer

Related codes

P1B90P1B92P0AA6

FAQ

What does the P1B91 code mean?

P1B91 is an OBD-II diagnostic trouble code that indicates: Hybrid/Electric Vehicle Battery 58 Circuit Low Voltage

What causes a P1B91 error code?

The most common causes of P1B91 include: Low voltage battery; Problems with battery connections; Battery management system (BMS) malfunction; Damage to high voltage cables.

How do I fix a P1B91 diagnostic trouble code?

To fix P1B91: Check the charge level of the high-voltage battery. Inspect the battery connections and connectors. Check the condition of high-voltage cables. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1B91?

Limited driving only, diagnose soon

How much does it cost to fix P1B91?

The estimated repair cost for P1B91 is $167–1111. Actual cost depends on your vehicle, location, and labor rates.

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