P1816
Transmission Fluid Pressure Valve Position Switch-Park/Neutral With Drive Ratio
Severity
⚠️ MediumCan you drive?
Limited driving only, diagnose soon
Approx. repair cost
$28–89 (est.)
Symptoms
- Incorrect automatic transmission gear shifting
- Slipping when shifting gears
- Hard or abrupt shifts
- Check Engine Light Is On
- The gearbox goes into emergency mode
Causes
- Pressure valve position sensor malfunction
- Pressure valve stuck or worn
- Low transmission fluid level
- Contaminated or old transmission fluid
- Problems in the sensor electrical circuit
How to Fix
- Check the level and condition of the transmission fluid
- Scan the transmission for additional error codes
- Check electrical connections and sensor circuit
- Replace pressure valve position sensor if necessary
- Flush the system and replace transmission fluid