P1728high severityPowertrain
Transmission Slip Error
on 2018 Ford Flex 3.5L V6 EcoBoost · AWD
What this code means
The PCM/TCM has detected excessive transmission slip. The actual gear ratio does not match the expected ratio, indicating the transmission is slipping during operation.
Symptoms
- Check Engine Light
- Transmission slipping during acceleration
- RPM flare between shifts
- Harsh shifting
- Reduced fuel economy
- Transmission overheating
Common causes
- Low transmission fluid
- Worn clutch packs
- Faulty shift solenoids
- Valve body issue
- Torque converter failure
- Contaminated transmission fluid
Diagnostic steps
- Check transmission fluid level and condition (color, smell)
- Monitor transmission slip with scan tool
- Check line pressure
- Inspect shift solenoid operation
- Perform transmission fluid and filter service
Repair notes
Check fluid level first. Perform fluid and filter service. If slip persists, internal transmission repair or rebuild likely needed.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1