Over drive light blinking

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Apr 8, 2022 | 10:17 PM

Kaleb924

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New User

Joined: Oct 2021

Posts: 13

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Over drive light blinking

Over drive light started blinking today when I started towing a small load, truck shifted perfectly, fluid was normal, any reason for it to start blinking randomly?

Apr 8, 2022 | 10:23 PM

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

Posts: 24,739

Likes: 2,669

From: SE Florida

Yes, there is a reason. Something is wrong with the transmission system. If you'd like to find out what's wrong, read the codes. You can get Forscan at www.forscan.org, or take it to a good independent shop, or a Ford dealer. The auto parts stores that read codes free CANNOT read the codes that flash the OD light.

Apr 8, 2022 | 10:51 PM

Kaleb924

Thread Starter

New User

Joined: Oct 2021

Posts: 13

Likes: 1

Quote:

Originally Posted by Mark Kovalsky

sorry for my lack of knowledge but to use forscan I need a Bluetooth obd scanner and an android device correct?

Apr 9, 2022 | 04:33 AM

FinnishStroker

Cargo Master

Joined: Mar 2019

Posts: 2,907

Likes: 788

From: Kinnula,Finland

Yes, and BAFX or OBDLINK for the win.

Apr 9, 2022 | 09:10 AM

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

Posts: 24,739

Likes: 2,669

From: SE Florida

Quote:

Originally Posted by Kaleb924

sorry for my lack of knowledge but to use forscan I need a Bluetooth obd scanner and an android device correct?

I use an OBDII - USB cable adapter and a laptop.

Apr 9, 2022 | 10:30 AM

White95PSD

Tuned

Joined: Jan 2020

Posts: 338

Likes: 112

From: Southern California

Quote:

Originally Posted by Mark Kovalsky

Awhile back I had this same OD light blinking and used Marks recommendation for FORScan. Got my code P1728, then took it to a highly rated transmission shop near by. They wanted to do a full rebuild. Previous owner had the tranny rebuilt 2 years prior. I didn’t have the funds at the time so I came back on this forum and talked to Mark with more detailed info on symptoms I was experiencing. I reset the code. The one symptom that caught my attention was while I was cruising in OD around 60mph up a hill, after I reset the code, I felt a light thump, then OD light started blinking again. Mark advised my that it seemed like the TC. I saved up for one and kept resetting this code as it caused limp mode. It was progressively getting worse as the time between resetting the code to it coming back on starting happening frequently. So I pulled out the tranny and replaced the TC, installed a John Wood VB. Over a year and half later it’s been going good! Problem fixed! Thanks Mark.