OBD Guide
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P1A04

Battery Energy Control Module Programming Read Only Memory

P1A04 is an OBD-II diagnostic trouble code meaning: Battery Energy Control Module Programming Read Only Memory. Common causes: control module software failure, damage to module rom. Estimated repair cost: $167–556.

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

Symptoms

  • Check Engine light comes on
  • Reduced performance of the hybrid system
  • The car goes into emergency mode
  • Battery charging problems
  • Reduced engine power

Causes

  • Control module software failure
  • Damage to module ROM
  • Problems with module power supply
  • Corroded or damaged connectors
  • Physical damage to the module

How to Fix

  1. Check connections and module wiring harness
  2. Check power supply and grounding of the module
  3. Try to reflash the module
  4. Replace battery energy management module if necessary
  5. Repair only from an authorized dealer

Related codes

P1A00P1A01P1A02

FAQ

What does the P1A04 code mean?

P1A04 is an OBD-II diagnostic trouble code that indicates: Battery Energy Control Module Programming Read Only Memory

What causes a P1A04 error code?

The most common causes of P1A04 include: Control module software failure; Damage to module ROM; Problems with module power supply; Corroded or damaged connectors.

How do I fix a P1A04 diagnostic trouble code?

To fix P1A04: Check connections and module wiring harness. Check power supply and grounding of the module. Try to reflash the module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1A04?

Limited driving only, diagnose soon

How much does it cost to fix P1A04?

The estimated repair cost for P1A04 is $167–556. Actual cost depends on your vehicle, location, and labor rates.

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