Auxiliary Ignition Switch On/Start Position Circuit Low

Where it lives

For P25B8, the switch sits on the circuit this code reports. The description of P25B8 reports a fault at the switch.

Check these first

• An open in the auxiliary ignition switch on/start signal wire
• A worn ignition switch contact for the on/start position
• A loose or corroded connector on the auxiliary ignition circuit
• A short to ground pulling the on/start signal low

What to do next

1. Read the auxiliary ignition switch on/start input on a scan tool
2. Test the on/start signal wire for an open
3. Check the ignition switch contact for wear
4. Inspect the auxiliary ignition circuit connectors for corrosion
5. Replace the auxiliary ignition switch if the wiring tests good
6. Clear the code and retest

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