How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Timnoll Your Own Question
Timnoll, Mercury Technician
Category: Mercury
Satisfied Customers: 1044
Experience:  23 years Dealership experience, Ford Senior Master Technician since 2000, ASE Master since 1985
Type Your Mercury Question Here...
Timnoll is online now
A new question is answered every 9 seconds

My overdrive light is flashing & car O/D not kicking in .

This answer was rated:

My overdrive light is flashing & car O/D not "kicking in". What can I do before taking it to a shop?


What year of Ford?

What model of Ford?

Does it ever shift into overdrive?

Did this start all of a sudden with no other symptoms?


I will help you with a little more information.




Customer: replied 8 years ago.

2003 Mercury Mountaineer


Usually shifts fine


Started without any other problems occuring.





You most likely have an issue with a mechanical concern in the transmission. On this model this could mean a servol bore worn out, a band broken or a possibly a valve body issue. The flashing light means there is a code stored in the system related to the transmission. There really is not much that you could do. You could have the codes pulled by a parts store, but this won't tell us much. This transmission had an issue with the servo bore wearing out in the case. There is a repair available to fix this without replacing the case. It will have to be diagnosed by a good tech to know for sure what is wrong. I wish I had better news for you. If you would like to get the codes retrieved (auto parts stores such as Autozone will do this for free) I will be happy to explain the codes and what they may mean. I hope this helps you. If you need anything else, just reply back and I will be happy to assist you more.




Timnoll and other Mercury Specialists are ready to help you