Turn signal indicator blinking fast

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Jan 6, 2025 | 01:05 PM

#31

Phillbo

More Turbo

Joined: Mar 2024

Posts: 546

Likes: 461

Someone has to go there...... Maybe your blinker fluid is low :

Feb 2, 2025 | 08:59 AM

#32

MacjjMac

4th Gear

Joined: Jun 2022

Posts: 4

Likes: 1

I started having the same issues. Where did you find the “As-Built” codes using the VIN - on Forscan?

Feb 2, 2025 | 09:03 AM

#33

copper1977

Thread Starter

Cross-Country

Joined: May 2018

Posts: 87

Likes: 3

From: Prairieville, LA

https://www.motorcraftservice.com/AsBuilt

Feb 2, 2025 | 11:40 AM

#34

MacjjMac

4th Gear

Joined: Jun 2022

Posts: 4

Likes: 1

Thanks

Feb 3, 2025 | 08:47 AM

#35

PURSUIT ELECTRONICS

Cross-Country

Joined: Nov 2024

Posts: 69

Likes: 13

Quote:

Originally Posted by Poncho450

Yup. Check the plug in the harness in the spare tire area. Pop it apart, clean and pack with dielectric grease. I had all kinds of weird stuff happening with my 2017 last year due to that plug.

that plug is going to make me run face first into a cactus! Causes BLIS warning, Cross Traffic Warning…luckily, no other issues like others have noted. I just get tired of clearing the dash every time I start the truck,

Feb 9, 2025 | 10:56 AM

#36

MacjjMac

4th Gear

Joined: Jun 2022

Posts: 4

Likes: 1

Uploaded the factory As Built and voila all is good. No more double blink. Thanks

May 31, 2025 | 04:19 PM

#37

Dan Blair

2nd Gear

Joined: May 2025

Posts: 2

Likes: 0

Hyper flashing dash signals

Quote:

Originally Posted by copper1977

My turn signal indicator in the instrument cluster started flashing fast today for no apparent reason. All turn signals are flashing at the correct speed but the indicator is flashing fast. To make it even stranger, it will correct itself if the truck is turned off but acc mode is on but as soon as the vehicle is started, it starts flashing fast again.

Anyone ever experienced this or have any ideas as to what is wrong?

Truck is a 2017 F250 Platinum (all LED) with stock lighting.

My turn signals were hyper flashing on the dash and I tried some remedies on this thread to no avail. Then I started getting messages on my truck for low battery power. One morning it was completely dead. I replaced my battery a lo and behold my dash indicators were flashing a normal rate along with the front and taillights. Could be that your battery needs replacing. It worked for me.

May 31, 2025 | 04:47 PM

#38

Sport45

Cargo Master

Joined: Apr 2003

Posts: 2,058

Likes: 424

From: Too close to Houston

The OP solved his issue with a Forscan change 5 years ago. But checking batteries is never a bad idea when chasing electronic gremlins

May 31, 2025 | 08:46 PM

#39

jghaviland

Cross-Country

Joined: Jan 2005

Posts: 85

Likes: 38

From: Socialist State of WA

same issue on my 2022, started on our vacation to Grand Canyon, about 2.000 miles into the 2,900 mile trip. All bulps are working fine, left turn signal only.

Jun 4, 2025 | 03:06 PM

#40

jghaviland

Cross-Country

Joined: Jan 2005

Posts: 85

Likes: 38

From: Socialist State of WA

I did as others have done, disconnected the + side of the battery, applied dielectric grease and tightened it back up and behold things are good!

Jun 5, 2025 | 07:23 PM

#41

jghaviland

Cross-Country

Joined: Jan 2005

Posts: 85

Likes: 38

From: Socialist State of WA

Quote:

Originally Posted by jghaviland

I did as others have done, disconnected the + side of the battery, applied dielectric grease and tightened it back up and behold things are good!

Things were good for about 10 minutes, back to fast blinking.

Jun 8, 2025 | 10:48 AM

#42

Dan Blair

2nd Gear

Joined: May 2025

Posts: 2

Likes: 0

Check for mouse

Mine were doing the same thing and I finally gave up and took it to Ford. They found chewed wires and a mouse nest with baby mice. $500.

Jun 8, 2025 | 02:41 PM

#43

jghaviland

Cross-Country

Joined: Jan 2005

Posts: 85

Likes: 38

From: Socialist State of WA

OK, this is crazy. Earlier I disconnected the positive side of the battery and that did not correct the blinker indicator. Just now, after cleaning a bunch of the connectors with no impact, I disconnected the negative side of the battery and guess what? It is not corrected!

What possible difference can it make between the positive side and the negative side? Obviously, some difference because now it is working.

Oct 17, 2025 | 10:59 PM

#44

21_F35O

1st Gear

Joined: Oct 2025

Posts: 1

Likes: 0

From: WA

Same Issue

Quote:

Originally Posted by Brian Hawley

Well my 2020 SD did the same thing on the left turn signal. Took the dealer a month. Replaced lighting control module, replaced all bulbs, replaced several sections of wire harness, did a few overlays around the wiring harnesss and reprogrammed a control module. Finally fixed it. Now at 35k and the right blinker now doing same thing! QUOTE=copper1977;19171169]My turn signal indicator in the instrument cluster started flashing fast today for no apparent reason. All turn signals are flashing at the correct speed but the indicator is flashing fast. To make it even stranger, it will correct itself if the truck is turned off but acc mode is on but as soon as the vehicle is started, it starts flashing fast again.

Anyone ever experienced this or have any ideas as to what is wrong?

Truck is a 2017 F250 Platinum (all LED) with stock lighting.

[/QUOTE]

I have the same exact thing happening with my right now. It's a '21 F350 Plat.
Out of the blue, indicator started flashing fast, all signals and lights are working and when truck is turned off and acc mode is on, it flashes normally. I've had it twice where the indicator was flashing normally for a day, and then went back to flashing fast.
Anyone have a solution??