P305B
DC/DC Converter Ignition On/Start Switch Circuit High Voltage
P305B is an OBD-II diagnostic trouble code meaning: DC/DC Converter Ignition On/Start Switch Circuit High Voltage. Common causes: dc/dc converter malfunction, problems with wiring or harness. Estimated repair cost: $56–167.
Symptoms
- The car won't start
- Dashboard flashing or turning off
- Problems with car electronic systems
- Warning messages on display
- Reduced hybrid system performance (if applicable)
Causes
- DC/DC converter malfunction
- Problems with wiring or harness
- Short circuit in the circuit
- Ignition switch malfunction
- Problems with the control unit
How to Fix
- Check the voltage in the ignition switch circuit
- Inspect the wiring harness for damage
- Check the operation of the DC/DC converter
- Test the ignition switch
- If necessary, replace faulty components
Related codes
FAQ
What does the P305B code mean?
P305B is an OBD-II diagnostic trouble code that indicates: DC/DC Converter Ignition On/Start Switch Circuit High Voltage
What causes a P305B error code?
The most common causes of P305B include: DC/DC converter malfunction; Problems with wiring or harness; Short circuit in the circuit; Ignition switch malfunction.
How do I fix a P305B diagnostic trouble code?
To fix P305B: Check the voltage in the ignition switch circuit. Inspect the wiring harness for damage. Check the operation of the DC/DC converter. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P305B?
Do not drive — repair immediately
How much does it cost to fix P305B?
The estimated repair cost for P305B is $56–167. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat