What does P1728 mean on a Ford?

P1728. Transmission Slip Error. Applies to F-150, Super Duty, Explorer towing or with high mileage.

What causes P1728 on a Ford?

Worn clutch packs slipping as the transmission loads up Low line pressure from a weak pump or a leaking apply circuit Low or burnt transmission fluid Torque converter that fails to transfer drive Input or output speed sensor misreporting a slip that is not there

How do I fix P1728 on a Ford?

Check the fluid level and smell. Burnt fluid points to internal damage Compare input and output speed data with a scan tool to confirm the slip Test line pressure against Ford spec Stop towing while the transmission slips to limit clutch damage Confirm the speed sensors read correctly before any teardown Clear the code and retest to see whether the slip returns

Code

P1728

Transmission Slip Error

Category: Powertrain - Transmission
Severity: Check Engine Light
Applies to: F-150, Super Duty, Explorer towing or with high mileage
Related: P0730 Incorrect Gear Ratio on OBD Codes List

Findings, check these first

Worn clutch packs slipping as the transmission loads up
Low line pressure from a weak pump or a leaking apply circuit
Low or burnt transmission fluid
Torque converter that fails to transfer drive
Input or output speed sensor misreporting a slip that is not there

Standard procedure

Check the fluid level and smell. Burnt fluid points to internal damage
Compare input and output speed data with a scan tool to confirm the slip
Test line pressure against Ford spec
Stop towing while the transmission slips to limit clutch damage
Confirm the speed sensors read correctly before any teardown
Clear the code and retest to see whether the slip returns

Code lookup

Type a code above, or start from a symptom or a common code.

Press / to jump to the box. Ford-enhanced powertrain, body, chassis and network codes. Generic P0xxx codes live on OBD Codes List.

Sources and review

Review: checked against the recorded source material.

OBDII.pro: P1728 Ford definition
live reference page (obdii.pro)
Supports: Ford-family meaning for P1728: Transmission Slip Error
Fetched directly. obdii.pro is a publisher independent of the engine-codes family.
P1728 FORD Code: Meaning, Causes, and Symptoms | OBD2 Codes
live reference page (obd2-codes.co)
Supports: Ford meaning for P1728: Transmission Slip Error
Fetched directly. obd2-codes.co phrasing matches the engine-codes family, so it counts as one publisher.

Last updated 2026-10-10.

Report a correction for P1728. Include your vehicle, the issue and a source if you have one.