OBD Guide

P25B7

Auxiliary Ignition Switch On/Start Position Circuit

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$6–33 (est.)

Symptoms

  • Problems starting the engine
  • Auxiliary systems do not work when the ignition is turned on
  • Check Engine Light Is On
  • Intermittent operation of auxiliary devices

Causes

  • Open or short circuit in the circuit
  • Malfunction of the auxiliary ignition switch
  • Bad contacts in connectors
  • Relay or fuse problems
  • Control unit malfunction

How to Fix

  1. Check the integrity of the circuit and contacts
  2. Inspect connectors and wiring for damage
  3. Check the condition of fuses and relays
  4. Test the operation of the auxiliary ignition switch
  5. If necessary, replace faulty components

Related codes

Error P25B7 by Vehicle Brand