Upshift Switch Circuit

Where it lives

For P0815, the circuit described runs through the switch. The description of P0815 reports a fault at the switch.

Check these first

• An open or short in the upshift switch circuit
• A faulty upshift switch
• Corrosion at the upshift switch connector
• A PCM or TCM fault on the upshift input
• A voltage spike on the upshift switch circuit

What to do next

1. Read the upshift switch state on a scan tool
2. Test the upshift switch circuit for an open or short
3. Check the switch and connector
4. Check the PCM and TCM for updates
5. Replace the switch if the circuit tests good
6. Clear the code and retest

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