Fuel Mode Select Switch Circuit Intermittent/Erratic

Where it lives

For P25A8, the circuit described runs through the switch. The description of P25A8 reports a fault at the switch.

Check these first

• A worn fuel mode select switch with intermittent contacts
• A loose or corroded connector at the fuel mode select switch
• A chafed signal wire grounding against the chassis
• An intermittent open in the fuel mode select switch circuit

What to do next

1. Read the fuel mode select switch input on a scan tool while moving the switch
2. Wiggle-test the switch connector and harness for dropouts
3. Test the switch circuit for intermittent opens and shorts
4. Inspect the switch for worn detents or contamination
5. Replace the fuel mode select switch if the circuit tests good
6. Clear the code and retest

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