why is my overdrive coming on

Asked by Jun 20, 2014 at 12:07 PM about the 1999 Mercury Grand Marquis 4 Dr LS Sedan

Question type: General

when i drive the car for about 10 min the overdrive comes on flashing but if i stop and cut
the car off and back on it goes away but it comes back on after 5 or 10 min

2 Answers

223,655

If you look in your owners manual a flashing O/D off light means the computer has detected a fault with the transmission. Have the car scanned for the code or codes and have the car properly diagnosed to see what the issue is. Could be a sensor to a transmission rebuild.

4 out of 4 people think this is helpful.

Your overdrive button/switch needs to be replaced.

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