P1890
Shift Control System
Severity
🔴 HighCan you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–167 (est.)
Symptoms
- The car goes into emergency automatic transmission mode
- Difficult or harsh gear shifting
- Inability to shift into certain gears
- Check Engine light comes on
- Reduced acceleration dynamics
Causes
- Shift solenoids malfunction
- Problems with control system wiring or connectors
- Low or contaminated transmission fluid
- Mechanical damage inside the gearbox
- Transmission control module (TCM) malfunctions
How to Fix
- Check the level and condition of the transmission fluid
- Diagnose electrical circuits and connectors of the control system
- Check the operation of the switching solenoids
- Scan the transmission control unit for errors
- If necessary, replace faulty control system components