Overdrive light flashes when I go up a steep grade

Tiny
JPZANDK8
  • MEMBER
  • 1997 FORD EXPEDITION
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 162,000 MILES
The code reader says it's the transfer case but I have a 2wd and I don't think my truck comes with one and it confuses me on what is broken. I have also noticed she is a tad more sluggish than usual. Does it sound like my transmission blew up?
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Thursday, March 11th, 2021 AT 11:00 AM

6 Replies

Tiny
KASEKENNY1
  • EXPERT
Normally the flashing OD light when pulling a grade is telling you that the torque converter is slipping and not able to lock like it is supposed too.

When you checked codes was your scan tool able to pull transmission codes? Unfortunately they are different so we need to make sure it is able to do that as I suspect you have a code like a P0733 which is for the torque converter clutch solenoid. Basically this is monitoring the input and output speed of the transmission so that it can tell if the converter is slipping.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Let's stop by a parts store and see if they can pull other codes that will point us in this direction.

If not, we are going to need to use a scan tool that will tell us what the input and output speed sensors are reading. Basically the input speed is engine speed but we need to see what the output speed is when the torque converter is locked up.

Let's start with this and go from there. Thanks
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Friday, March 12th, 2021 AT 2:13 PM
Tiny
KASEKENNY1
  • EXPERT
Sorry. I forgot to mention. Have you checked the fluid condition? If the fluid is burned then we need to change it but this also points to a clutch slipping as that is what causes the fluid to deteriorate. Heat from a slipping clutch burns the fluid and makes these issues worse.

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

Thanks
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Friday, March 12th, 2021 AT 2:21 PM
Tiny
JPZANDK8
  • MEMBER
The fluid is still good and bright pink like it should be.
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Friday, March 12th, 2021 AT 2:23 PM
Tiny
KASEKENNY1
  • EXPERT
Okay. Then we need to double check codes with a scan tool that we know can read transmission codes. This flashing light is like a check engine light for the transmission only. It could be a sensor, circuit, or solenoid issue.

Again, I am betting a torque converter issue.
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Friday, March 12th, 2021 AT 5:16 PM
Tiny
JPZANDK8
  • MEMBER
Well, now it makes a clunk when I switch it from reverse to drive or first, but it when I'm in gear and switch it to neutral it doesn't make any noise and it sounds like I need a new transmission or rebuild it. I'm doubting it is the torque converter.
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Friday, March 19th, 2021 AT 12:36 PM
Tiny
KASEKENNY1
  • EXPERT
Can you get a video of what it is doing? You may be correct with this because seeing it/hearing it is different then just reading about it. Let us know what turns out with this if you can't get the video. Thanks
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Friday, March 19th, 2021 AT 7:54 PM

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