Transmission not shifting properly and overdrive light is flashing

Tiny
CHASE1041
  • MEMBER
  • 1998 MAZDA B4000
  • 4.0L
  • V6
  • 4WD
  • AUTOMATIC
  • 217,000 MILES
Okay, I have a new problem. I switched my truck into 4x4 Low and when I turned it off now the overdrive light is flashing. It did this once and it finally jerked out and started to work. But it is not wanting to go past 3rd gear when that light is flashing.
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Sunday, August 1st, 2021 AT 3:26 AM

3 Replies

Tiny
KASEKENNY
  • EXPERT
A flashing overdrive light means we have a sensor, shifter, or internal electrical transmission issue.

We need to start with checking for codes which will tell us what general area the issue is in.

Here is a guide that will help with this:

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

This could just be a simple sensor issue or more complicated so we need to start at the basics. Let's check the fluid and make sure it is the proper level and color.

It is unlikely that the fluid will fix this issue but the last thing we want is to fix this issue and just have another because of the fluid. Plus the fluid is also a sign of greater issues so we need to start with this and codes.

I attached the info below on how to change the fluid. Please let us know what you find.

Thanks
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Sunday, August 1st, 2021 AT 7:46 AM
Tiny
CHASE1041
  • MEMBER
I have replaced my transmission filter and the internal magnet was full with normal debris so all good there. I did turn off my four-wheel-drive and the overdrive like quit blinking and now it shifts. I m not going to use four-wheel-drive again every time. I use it it causes that overdrive light to come on.
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Sunday, August 1st, 2021 AT 8:07 AM
Tiny
KASEKENNY
  • EXPERT
Okay. When the light is flashing, let's check for codes. More than likely this is a shift motor or other part of the system causing this to flash, but we need to find out what codes are there and see what direction it points us in.

As you can see from other vehicles these types of issues are common. Granted this other one does not have the overdrive light flashing but they are still similar issues.
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Sunday, August 1st, 2021 AT 11:10 AM

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