OBD Guide
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P1B29

Hybrid/Electric Vehicle Battery 28 Circuit

P1B29 is an OBD-II diagnostic trouble code meaning: Hybrid/Electric Vehicle Battery 28 Circuit. Common causes: poor contact in cell 28 connector, damage to the wiring harness to the cell. 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 Is On
  • Hybrid system power reduction
  • Reducing electric range
  • The car goes into emergency mode
  • Increased fuel consumption

Causes

  • Poor contact in cell 28 connector
  • Damage to the wiring harness to the cell
  • Battery cell degradation or malfunction
  • Problems with the Battery Monitoring Module (BMS)
  • Corrosion of contacts in the battery circuit

How to Fix

  1. Carry out diagnostics of the high-voltage battery
  2. Check continuity of circuit to cell 28
  3. Inspect connectors and contacts for corrosion
  4. Replace the faulty cell if necessary
  5. Update BMS software if necessary

Related codes

P1B28P1B30P0A80

FAQ

What does the P1B29 code mean?

P1B29 is an OBD-II diagnostic trouble code that indicates: Hybrid/Electric Vehicle Battery 28 Circuit

What causes a P1B29 error code?

The most common causes of P1B29 include: Poor contact in cell 28 connector; Damage to the wiring harness to the cell; Battery cell degradation or malfunction; Problems with the Battery Monitoring Module (BMS).

How do I fix a P1B29 diagnostic trouble code?

To fix P1B29: Carry out diagnostics of the high-voltage battery. Check continuity of circuit to cell 28. Inspect connectors and contacts for corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1B29?

Limited driving only, diagnose soon

How much does it cost to fix P1B29?

The estimated repair cost for P1B29 is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat