Question about Pontiac Grand Prix
Overdrive light starts blinking at red light in drive, will not start flashing in neutral or when ambient temperature is above 60 F. Diagnostic code is P0720, speed sensor is bad. V.S.S. was replaced but problem continues. Thank you
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Posted on Jan 02, 2017
The blinking overdrive button is telling u that a serious fault has occurred in the electronic controls or a mechanical fault such as excess slippage is occurring.
Posted on Nov 06, 2008
SOURCE: overdrive light started flashing
the OD light is flashing to let u know a fault has occurred in the transmission electronic controls or that it is slipping plus other issues, go to Kragen or Autozone and ask them to run a trouble code test, it is free, post the code back here for me to look at.
Posted on Jan 14, 2009
The overdrive light blinking means that a fault code has been stored in the computer, this can be for many different reasons. The car isn't actually turning overdrive on and off, it is just a way to alert you of a problem. Getting the computer scanned will provide a fault code eg. P(XXXX) if you can get this code I can help you further. -Jared
Posted on Nov 14, 2008
I have that exact same truck and transmission and My Transmission did the exact same thing about a year ago and there was some kind of snap ring inside the transmission that broke. I originally thought it had to be an electirical problem because the truck shifted fine until OD or if i turned OD off. The 4r70w is a light transmission and i would suggest you have a shift kit put in and they make a heavier kit to beef it up.. Sorry its probably not the new you were looking for.
Posted on Apr 15, 2009
It means the transmission has seen a fault and there will be a code set for
the fault. Get the trouble codes read at an auto parts store such as AutoZone where they usually do it free and post the code if you can. It can reset its self
every time you turn the vehicle off but it will not fix the problem. Could be a minor or a major problem so you don't know till the codes are read.
Posted on Apr 26, 2009
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