Code result
P2858
Clutch B Pressure Engagement Performance/Too Low
High severity
What it means
Clutch B engagement pressure is below the calibrated minimum. Slip during launch and torque transfer reduced.
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
Hydraulic pump output pressure low
highOne of the most commonly reported causes for this code — check this first.
Pressure regulator characteristic drift
mediumA plausible cause — test and verify before replacing parts.
Related help
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