OBD Guide
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P3240

Hybrid/EV Battery Interface Control Module 1 Cell Overvoltage

P3240 is an OBD-II diagnostic trouble code meaning: Hybrid/EV Battery Interface Control Module 1 Cell Overvoltage. Common causes: imbalance of cells in the battery pack, battery cooling system malfunction. Estimated repair cost: $167–889.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$167–889 (est.)

Symptoms

  • Hybrid system power reduction
  • Malfunction warning on the instrument panel
  • The car goes into emergency mode
  • Extended charging time
  • Reduced electric range

Causes

  • Imbalance of cells in the battery pack
  • Battery cooling system malfunction
  • Charger problems
  • Battery cell degradation
  • Errors in the operation of the BMS control module

How to Fix

  1. Diagnosis of high-voltage battery condition
  2. Checking the battery cooling system
  3. Balancing Battery Cells
  4. Replacing faulty battery cells
  5. BMS module software update
  6. Repair only from an authorized dealer

Related codes

P3241P3242P0A80

FAQ

What does the P3240 code mean?

P3240 is an OBD-II diagnostic trouble code that indicates: Hybrid/EV Battery Interface Control Module 1 Cell Overvoltage

What causes a P3240 error code?

The most common causes of P3240 include: Imbalance of cells in the battery pack; Battery cooling system malfunction; Charger problems; Battery cell degradation.

How do I fix a P3240 diagnostic trouble code?

To fix P3240: Diagnosis of high-voltage battery condition. Checking the battery cooling system. Balancing Battery Cells. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P3240?

Do not drive — repair immediately

How much does it cost to fix P3240?

The estimated repair cost for P3240 is $167–889. Actual cost depends on your vehicle, location, and labor rates.

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