Blinking OFF light on gear shift handle

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Jan 15, 2025 | 06:04 PM

Texas99F250SuperDuty

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3rd Gear

Joined: Jan 2025

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From: Hondo

Blinking OFF light on gear shift handle

Hello Ford People. I have a 1999 F250 Super Duty 7.3. When I hit the fuel throttle a little hard or climbing a steep hill my transmission drops out of overdrive and the off light on the shift lever comes on and blinks. The truck will not go back into overdrive. What I have to do is place it in neutral, turn the truck off and back on. This clears what ever is happening and the truck will then go back into overdrive. Mechanic replaced the shift solenoid and some wiring from the transmission to ??. Truck is still doing the same thing and mechanic is now saying he thinks its the PCM. Have any of you fine folks experienced this and what was your fix? Thank You for any advise and help.

Last edited by Texas99F250SuperDuty; Jan 15, 2025 at 06:05 PM.

Jan 15, 2025 | 06:22 PM

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

Posts: 24,722

Likes: 2,648

From: SE Florida

The ONLY way to know what to fix is to read the codes. When the OFF light flashes it means code(s) are stored in the PCM. Just randomly replacing parts is going to cost a lot of money before you happen to find the problem.

You can download Forscan free at www.forscan.org. Their page shows how to select on adapter to plug into the OBDII port. This is the best way to read the codes. Do not take it to an auto parts store to read the codes, they cannot read Ford transmission codes.

Jan 16, 2025 | 08:22 PM

Texas99F250SuperDuty

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3rd Gear

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From: Hondo

Blinking OFF light

Thank You Mark

Jan 19, 2025 | 04:01 PM

Toreador_Diesel

FTE Leadership Emeritus

Joined: Sep 2003

Posts: 12,246

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From: Houston, Texas

Did your find out what it was ?

Jan 20, 2025 | 08:39 PM

Texas99F250SuperDuty

Thread Starter

3rd Gear

Joined: Jan 2025

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From: Hondo

Not yet. Taking it to a transmission shop tomorrow. Hopefully they can test the pressure, as the only code that came up was that it could not connect to the computer.