P1783 Transmission Over-Temperature Condition

What does P1783 mean on a Ford?

P1783 — Transmission Over-Temperature Condition. This Ford-enhanced code applies to F-150, Super Duty, Expedition, E-Series used for towing.

Common causes of P1783

• Heavy towing or hauling beyond cooler capacity
• Low or degraded transmission fluid
• Restricted transmission cooler or lines
• Torque converter clutch failing to lock up
• Faulty TFT sensor falsely reporting over-temperature

How to fix P1783

1. Stop and let the transmission cool before continuing
2. Check fluid level and condition — burnt fluid needs a full service
3. Inspect the transmission cooler and lines for restriction or damage
4. Verify torque converter lockup with a scan tool on the highway
5. Confirm TFT accuracy before condemning the transmission