Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC P1890: Problem in CVT Speed Control System: General Description
The shift control system controls each gear position using a map stored in the powertrain control module (PCM) memory. The shift control system controls the CVT drive pulley pressure control solenoid valve and the CVT driven pulley pressure control solenoid valve according to the vehicle speed and the throttle position so the drive pulley speed becomes equal to the target value, i.e., it varies the hydraulic pressure applied to the drive and driven pulley and provides feedback on the difference between the target drive pulley speed and the actual drive pulley speed when driving. It supplies high hydraulic pressure to the driven pulley and enlarges the driven pulley belt diameter when shifting to a lower ratio. It supplies high hydraulic pressure to the drive pulley and enlarges the drive pulley belt diameter when shifting to a higher ratio. If the difference between the target drive pulley speed and the actual drive pulley speed is specified value when in D, S, L, or R, the PCM detects a malfunction in the CVT shift function and stores a DTC.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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