Downshift Switch Circuit Range/Performance

Where it lives

For P2779, start at the switch the description names.

Check these first

• A downshift switch reading outside its expected range
• High resistance in the downshift switch circuit
• A failed downshift switch
• A corroded downshift switch connector

What to do next

1. Read the downshift switch status on a scan tool
2. Press the downshift switch and watch the data change
3. Test the downshift switch circuit for added resistance
4. Check the downshift switch connector pins
5. Replace the downshift switch if the reading stays wrong
6. Clear the code and retest

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