What does P1783 mean on a Ford?

P1783. Transmission Over-Temperature Condition. Applies to F-150, Super Duty, Expedition, E-Series used for towing.

What causes P1783 on a Ford?

Heavy towing or hauling that pushes heat past the transmission cooler capacity Low or degraded transmission fluid Restricted transmission cooler or cooler lines Torque converter clutch that fails to lock up and creates slip heat Transmission fluid temperature (TFT) sensor reporting a false over-temperature

How do I fix P1783 on a Ford?

Stop and let the transmission cool before continuing to tow Check the fluid level and condition. Burnt fluid needs a full service Inspect the transmission cooler and lines for restriction or damage Verify torque converter clutch lockup with a scan tool at highway speed Test the TFT sensor accuracy before condemning the transmission Clear the code and retest under load to confirm the temperature stays in range

Code

P1783

Transmission Over-Temperature Condition

Category: Powertrain - Transmission
Severity: Check Engine Light
Applies to: F-150, Super Duty, Expedition, E-Series used for towing
Related: P0218 Transmission Fluid Temperature Sensor A Over Temperature Condition on OBD Codes List

Findings, check these first

Heavy towing or hauling that pushes heat past the transmission cooler capacity
Low or degraded transmission fluid
Restricted transmission cooler or cooler lines
Torque converter clutch that fails to lock up and creates slip heat
Transmission fluid temperature (TFT) sensor reporting a false over-temperature

Standard procedure

Stop and let the transmission cool before continuing to tow
Check the fluid level and condition. Burnt fluid needs a full service
Inspect the transmission cooler and lines for restriction or damage
Verify torque converter clutch lockup with a scan tool at highway speed
Test the TFT sensor accuracy before condemning the transmission
Clear the code and retest under load to confirm the temperature stays in range

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: P1783 Ford definition
live reference page (obdii.pro)
Supports: Ford-family meaning for P1783: Transmission Overtemperature Condition
Fetched directly. obdii.pro is a publisher independent of the engine-codes family.
P1783 FORD Code: Meaning, Causes, and Symptoms | OBD2 Codes
live reference page (obd2-codes.co)
Supports: Ford meaning for P1783: Transmission Over-Temperature Condition
Fetched directly. obd2-codes.co phrasing matches the engine-codes family, so it counts as one publisher.

Last updated 2026-10-10.

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