OBD Guide
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P305C

DC/DC Converter Ignition On/Start Switch Circuit Low Voltage

P305C is an OBD-II diagnostic trouble code meaning: DC/DC Converter Ignition On/Start Switch Circuit Low Voltage. Common causes: open or short circuit in the ignition switch circuit, ignition switch malfunction. Estimated repair cost: $17–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • Difficulty starting the engine
  • Unstable engine operation
  • Flashing indicators on the dashboard
  • Reduced power of electrical equipment

Causes

  • Open or short circuit in the ignition switch circuit
  • Ignition switch malfunction
  • Problems with DC/DC converter
  • Poor contact in connectors
  • Wiring harness damage

How to Fix

  1. Check the continuity of the ignition switch circuit
  2. Check the condition of the ignition switch
  3. Check the operation of the DC/DC converter
  4. Inspect and clean the contacts in the connectors
  5. Check wiring harness for damage

Related codes

P305DP305B

FAQ

What does the P305C code mean?

P305C is an OBD-II diagnostic trouble code that indicates: DC/DC Converter Ignition On/Start Switch Circuit Low Voltage

What causes a P305C error code?

The most common causes of P305C include: Open or short circuit in the ignition switch circuit; Ignition switch malfunction; Problems with DC/DC converter; Poor contact in connectors.

How do I fix a P305C diagnostic trouble code?

To fix P305C: Check the continuity of the ignition switch circuit. Check the condition of the ignition switch. Check the operation of the DC/DC converter. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P305C?

Yes, but get it checked soon

How much does it cost to fix P305C?

The estimated repair cost for P305C is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat