Code result
P0859
Traction Control Input Signal High
High severity
What it means
The traction control input signal to the ECM reports a input signal high condition. Engine torque reduction during wheel slip cannot be commanded reliably.
Is it safe to drive?
No — stop driving
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly.
Most likely causes
Signal wire shorted to B+
highOne of the most commonly reported causes for this code — check this first.
TCS module output high
mediumA plausible cause — test and verify before replacing parts.
Related help
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