Transmission Slip Error
2009-2012 Ford Flex 3.5L V6
Description
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.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1728 on Other Vehicles
Common Questions
What does code P1728 mean on a 2009-2012 Ford Flex?
P1728 stands for "Transmission Slip Error". 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.
What are the symptoms of P1728 on a Ford Flex?
Common symptoms of P1728 include: Check Engine Light, Transmission slipping during acceleration, RPM flare between shifts, Harsh shifting, Reduced fuel economy, Transmission overheating.
What causes P1728 on a 2009-2012 Ford Flex?
Common causes of P1728 include: Low transmission fluid, Worn clutch packs, Faulty shift solenoids, Valve body issue, Torque converter failure, Contaminated transmission fluid.