OBD Guide
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P3020

Battery Block 10 Becomes Weak

P3020 is an OBD-II diagnostic trouble code meaning: Battery Block 10 Becomes Weak. Common causes: natural wear and tear on the battery pack, cell imbalance. Estimated repair cost: $167–556.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$167–556 (est.)

Symptoms

  • Reduced electric range
  • Increased charging time
  • Unstable operation of the hybrid system
  • Warning messages on the dashboard

Causes

  • Natural wear and tear on the battery pack
  • Cell imbalance
  • Problems with the battery management system
  • Damage to battery cells
  • Problems with battery temperature

How to Fix

  1. Diagnosis of battery pack condition
  2. Checking the Battery Management System
  3. Balancing Battery Cells
  4. Replacing a faulty battery pack
  5. Control system software update

Related codes

P3010P3030P3040

FAQ

What does the P3020 code mean?

P3020 is an OBD-II diagnostic trouble code that indicates: Battery Block 10 Becomes Weak

What causes a P3020 error code?

The most common causes of P3020 include: Natural wear and tear on the battery pack; Cell imbalance; Problems with the battery management system; Damage to battery cells.

How do I fix a P3020 diagnostic trouble code?

To fix P3020: Diagnosis of battery pack condition. Checking the Battery Management System. Balancing Battery Cells. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P3020?

Yes, but get it checked soon

How much does it cost to fix P3020?

The estimated repair cost for P3020 is $167–556. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat