P1818
Transmission Fluid Pressure Valve Position Switch-Drive Without Drive Ratio
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)
Symptoms
- Incorrect gear shifting
- Gear slip
- Hard gear shifting
- Check Engine light comes on
- Reduced transmission efficiency
Causes
- Pressure valve position sensor malfunction
- Open or short circuit in the sensor circuit
- Problems with the transmission control unit
- Low transmission fluid level
- Transmission fluid contamination
How to Fix
- Check the level and condition of the transmission fluid
- Check the integrity of the sensor circuit
- Check the operation of the pressure valve position sensor
- Check the transmission control unit for errors
- If necessary, replace the sensor or transmission fluid