P1841
Automatic Transmission Fluid Pressure Switch 1
Severity
⚠️ MediumCan you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–56 (est.)
Symptoms
- Incorrect gear shifting
- Hard gear shifts
- Automatic transmission goes into emergency mode
- Check Engine Light Illuminates
- Decreased fuel efficiency
Causes
- Transmission fluid pressure sensor malfunction
- Open or short circuit in the sensor circuit
- Poor contact in the sensor connector
- Low or contaminated transmission fluid
- Transmission control module (TCM) problems
How to Fix
- Check the level and condition of the transmission fluid
- Visually inspect the sensor wiring and connectors
- Check sensor resistance and reference voltage
- If necessary, replace the pressure sensor
- Check the operation of the automatic transmission after repair