P2858
Clutch B Pressure Engagement Performance/Too Low
Clutch B engagement pressure is below the calibrated minimum. Slip during launch and torque transfer reduced.
Clutch B engagement pressure is below the calibrated minimum. Slip during launch and torque transfer reduced.
Common causes
- high
Hydraulic pump output pressure low
One of the most commonly reported causes for this code — check this first.
Typical part cost: $550-3300
- medium
Pressure regulator characteristic drift
A plausible cause — test and verify before replacing parts.
Typical part cost: $550-3300
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First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
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Related codes
See related trouble codes
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Frequently asked questions
What does P2858 mean?
P2858 means "Clutch B Pressure Engagement Performance/Too Low". It is a generic OBD-II code that points to a fault in the auxiliary emission controls.
What are the most common causes of P2858?
hydraulic pump output pressure low; pressure regulator characteristic drift — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly. Use the Wrenchify app for a full diagnosis specific to your vehicle.
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