OBD Guide
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P305F

Dual Battery Control Module Performance

P305F is an OBD-II diagnostic trouble code meaning: Dual Battery Control Module Performance. Common causes: dual battery control module malfunction, problems with wiring or connections. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Problems starting the engine
  • Flashing or dim dashboard lights
  • Warning messages on display
  • Unstable operation of the start-stop system
  • Low battery

Causes

  • Dual Battery Control Module Malfunction
  • Problems with wiring or connections
  • Additional battery malfunction
  • Short circuit in the system
  • Problems with the main battery

How to Fix

  1. Check the condition of both batteries
  2. Check connections and wiring integrity
  3. Test dual battery control module
  4. Replace the faulty module if necessary
  5. Update module software

Related codes

P305EP3060P305D

FAQ

What does the P305F code mean?

P305F is an OBD-II diagnostic trouble code that indicates: Dual Battery Control Module Performance

What causes a P305F error code?

The most common causes of P305F include: Dual Battery Control Module Malfunction; Problems with wiring or connections; Additional battery malfunction; Short circuit in the system.

How do I fix a P305F diagnostic trouble code?

To fix P305F: Check the condition of both batteries. Check connections and wiring integrity. Test dual battery control module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P305F?

Yes, but get it checked soon

How much does it cost to fix P305F?

The estimated repair cost for P305F is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat