OBD
P0858
Traction Control Input Signal Low
What it means
P0858 means Traction Control Input Signal Low.
Check these first
- A short to ground in the traction control input wire
- A traction control switch stuck closed
- A low battery voltage
- A poor traction control switch ground
What to do next
- Read traction control input voltage
- Test the input wire for a short to ground
- Check the battery voltage
- Check the switch ground
- Replace the switch if the signal stays low
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.