OBD
P0959
Auto Shift Manual Mode Circuit Intermittent
What it means
P0959 means Auto Shift Manual Mode Circuit Intermittent.
Check these first
- A mode switch connector losing contact
- Chafed mode switch wiring
- A mode switch failing when hot
- A loose mode switch mounting
What to do next
- Road test and watch auto shift manual mode data
- Wiggle test the mode switch connector and harness
- Cycle the mode switch and watch for dropouts
- Check the mode switch mounting
- Replace the mode switch if the signal drops
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.