P1780 Ford Code: Tackling Transmission Concerns Head-On

Welcome to our guide, where we embark on a journey to decode the P1780 Ford code. As a fellow car enthusiast, I understand the frustration it can spark. But fret not! In this article, we’re stepping into the intricate world of automotive diagnostics, unraveling the puzzle of the P1780 code in your Ford.

With a blend of technical know-how and practical advice, you’ll be equipped to tackle this challenge head-on.

So, let’s dive into the P1780 Ford code and tackle it together, armed with knowledge and determination!

P1780 Ford Code: A Quick Overview

Check the overview of the P1780 Ford code below!

  • Definition: Transmission Control Switch Circuit Out of Self Test Range
  • Severity: Medium
  • DIY Skill Level: Intermediate
  • Continue To Drive?: Yes
  • Estimated Repair Cost: $20 – $150

What Does The P1780 Code Mean On Ford?

The P1780 code signifies a Transmission Control Switch Out of Self-Test Range error in Ford vehicles. It points to a potential fault in the transmission control switch (TCS). This code is triggered when the transmission control switch fails to change states as expected. 

P1780 Ford codes appears on the scanner.
P1780 only appears on some Ford models equipped with automatic transmission.
(Credit: f150forum.com)

The TCS is primarily situated on the shift plate or shift knob, enabling drivers to select different gears while on the move. Commonly denoted as “OD off” or “OD cancel,” or occasionally as “Tow/Haul” in certain trucks, this button serves a specific purpose. Primarily, it prevents the transmission from engaging in overdrive mode. When the P1780 code is set, it means that the TCS is experiencing a malfunction, a situation that can adversely affect the normal functioning of the transmission.

The P1780 code can manifest across various Ford models equipped with automatic transmissions. While not an exhaustive list, some of the Ford models that may encounter this issue include F-150, Explorer, Ranger, Mustang, etc.

Read more: P1464 Ford Code: A Guide To Handling AC System Issues

How Severe Is The Ford Code P1780? 

The P1780 code indicating a TCS fault in Ford vehicles carries a moderate severity level. While it doesn’t pose an immediate safety risk, it can lead to transmission-related issues. It’s possible to drive with this code unaddressed. However, it could result in erratic gear changes, reduced fuel efficiency, and potential transmission overheating. 

It’s advisable not to ignore this code and to have the TCS inspected and repaired by a qualified technician. Continued driving with a malfunctioning TCS might exacerbate transmission problems, potentially leading to costly repairs. Addressing the issue promptly ensures consistent transmission performance and prevents further complications down the road.

What Are The Symptoms Of The P1780 Codes On Ford Vehicles?

Experiencing the P1780 code in a Ford vehicle may be accompanied by the following symptoms:

What Causes Of The P1780 Ford Code? 

The P1780 code in Ford vehicles can arise from various underlying causes, including:

  • Faulty TCS
  • Wiring or connector issues related to the TCS
  • ECM issues

How To Diagnose And Fix The P1780 Ford Code?

Confronting the P1780 code within your Ford vehicle demands a methodical strategy for effective resolution. So, here’s a breakdown of the essential tools and parts, followed by a step-by-step guide for the procedure.

Essential Tools And Parts

To successfully diagnose and repair the P1780 code, you’ll need the following tools and parts:

Step-by-Step Procedure

Step 1: Fuse inspection

  • Turn off the key
  • Measure fuse resistance with a value of less than 5 ohms
  • If resistance is below 5 ohms, replace the fuse

Step 2: Short to ground check

  • Disconnect the ECM
  • Measure resistance between PIN 41 and ground
  • Resistance should exceed 10,000 ohms
  • If it’s less, repair the circuit

Step 3: Voltage test for TCS circuit

  • Disconnect the ECM
  • Turn the key to the on position
  • Measure the voltage between Pin 41 and the ground while cycling the TCS switch
  • If voltage cycles, the ECM requires replacement

Step 4: Open circuit examination

  • Turn off the key
  • Disconnect the central junction box and transmission control switch
  • Measure resistance between CJB fuse 2.13 Pin 10 and power side of TCS Pin 2
  • Measure resistance between CJB fuse 2.13 Pin 10 and power side of TCS Pin 1
  • Both resistances should match. If not, repair the circuit

Step 5: Short to power check

  • Measure resistance between Pin 41 and Pin 1
  • Resistance should surpass 10,000 ohms
  • If not, repair the circuit

If these steps fail to identify the issue, consider replacing the transmission control switch. In case of uncertainty during testing, follow the steps sequentially and retest accordingly. This thorough approach ensures accurate diagnosis and effective resolution.

The TCS is positioned at various locations on Ford models, commonly integrated into the shift knob or shift plate. Replacing the attached assembly is typically required, as the switch is generally affixed and cannot be individually replaced.

Step 6: Clear code(s) and test drive

Clear the codes with the OBD-II scanner and test drive the vehicle to ensure proper shifting.


  • Double-check the wiring connections before replacing the TCS.
  • Be cautious while working around the transmission components.

Read more: P1132 Ford Code: Ignition Issues Explored

DIY Repair Level And Estimated Costs

If you’re confident in your automotive skills, you might consider tackling the issue. Nevertheless, if uncertainties arise, seeking a mechanic’s expertise is advisable.

For those seeking professional repair assistance, costs can vary depending on the specific problem and your location. However, here’s a basic idea of how much you might need to pay for the main repair tasks:

Repair TaskEstimated Cost Range
Shift knob or shift plate replacement$50 – $200
Check and Repair Wiring$50 – $150
ECM Replacement (rarely)$200- $1000

P1780 Ford Summarize Infographic

P1780 Ford
Check this infographic for the summarized information about this P1780 code on Ford vehicles.

Final Thoughts

Armed with insights into the P1780 Ford’s meaning, symptoms, and possible causes, you’re now poised to tackle this challenge head-on. Whether you’re a hands-on enthusiast or prefer professional intervention, addressing the issue is paramount. 

Join the conversation – share your experiences or questions in the comments below. Additionally, if this guide proves invaluable, spread the know-how and invite others to explore. Keep the wheels turning smoothly and the road ahead clear. Drive confidently!

Reference Sources

  1. JustAnswer, P1780 Ford Code Diagnosis
  2. Yourmechanic, Is It Safe to Drive With the Overdrive Light On?
  3. Bluespringsfordparts, DTC Decoded: P1780 – Transmission Control Switch Circuit

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