OBD Guide
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C1864

Battery Module Fault

C1864 is an OBD-II diagnostic trouble code meaning: Battery Module Fault. Common causes: battery control module malfunction, damage to module wiring harness. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Problems starting the engine
  • Check Engine Light Flashing or Turning On
  • Reduced voltage in the on-board network
  • Unstable operation of electronic systems

Causes

  • Battery control module malfunction
  • Damage to module wiring harness
  • Poor contact in module connectors
  • Problems with the battery itself

How to Fix

  1. Checking the battery condition
  2. Battery Control Module Diagnostics
  3. Checking the integrity of the wiring harness and connectors
  4. Replacing the control module if necessary
  5. Resetting the error and re-diagnosis

Related codes

P0562P0563P0620

FAQ

What does the C1864 code mean?

C1864 is an OBD-II diagnostic trouble code that indicates: Battery Module Fault

What causes a C1864 error code?

The most common causes of C1864 include: Battery control module malfunction; Damage to module wiring harness; Poor contact in module connectors; Problems with the battery itself.

How do I fix a C1864 diagnostic trouble code?

To fix C1864: Checking the battery condition. Battery Control Module Diagnostics. Checking the integrity of the wiring harness and connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1864?

Limited driving only, diagnose soon

How much does it cost to fix C1864?

The estimated repair cost for C1864 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat