2003 Ford F250 overdrive off light

2003 FORD F-250
155,000 MILES • V8 • 2WD • AUTOMATIC
Avatar
TONY43
  • MEMBER
  • 11 POSTS
some times, not all the time when I turn the key on the overdrive off light is on. at these times the engine will not start. I turn the key off and on until the light doesn't come on then the engine starts and runs normally. why is this and what can I do about it Thanks for any advice
Jan 23, 2010 at 10:45 AM
Advertisement
Avatar
TONY43
  • MEMBER
  • 11 POSTS
I haven't got an answer yet. why not?
Jan 24, 2010 at 4:37 PM
Avatar
TONY43
  • MEMBER
  • 11 POSTS
that is not an answer
Jan 24, 2010 at 4:40 PM
Advertisement
Avatar
2CARPRO JACK
  • CERTIFIED EXPERT
  • 11,533 POSTS
Sounds as though it may be an ignition switch or main power relay not working properly.Usually the trans wont keep a vehicle from starting.Need to check for fuel pressure, spark and injector pulse when it wont start to see which system isnt working, it may even be all of them
Jan 25, 2010 at 8:21 AM
Avatar
TONY43
  • MEMBER
  • 11 POSTS
Anything else
Jan 25, 2010 at 6:16 PM
Avatar
2CARPRO JACK
  • CERTIFIED EXPERT
  • 11,533 POSTS
Sure, when it wont start use atest light to be sure the fuse panel has powerat all fuses, this can be an indicator of a bad ign switch as well
Jan 26, 2010 at 7:38 AM
Avatar
TONY43
  • MEMBER
  • 11 POSTS
It is getting power to all the fuses. What I don't get is that it is a hit and miss thing, it starts sometimes ( only when the o/d light is not on). When it is on it never starts. When it is running I can jiggle the key switch and the shifter and it won't shut off, it runs fine until the next time I shut it off, then it may start right up or I may have to keep turning it on and off till that light goes out, then it will start again. could it still be the key switch.
Thanks for your help
Jan 26, 2010 at 1:24 PM
Avatar
2CARPRO JACK
  • CERTIFIED EXPERT
  • 11,533 POSTS
what is the security light doing when it wont start? flashing, steady or not on?
Jan 26, 2010 at 3:42 PM
Avatar
TONY43
  • MEMBER
  • 11 POSTS
It doesn't have any security or power locks or windows. It is just the basic model.
Thanks for any help you can give.
Jan 27, 2010 at 7:13 AM
Avatar
2CARPRO JACK
  • CERTIFIED EXPERT
  • 11,533 POSTS
Sounds like it may be a problem with a relay or the GEM module.What engine doest it have so I can look up some wiring?
Jan 27, 2010 at 7:32 AM
Avatar
TONY43
  • MEMBER
  • 11 POSTS
It's a 5.4 liter gas engine, 351 Thanks again.
Jan 27, 2010 at 8:08 AM
Avatar
TONY43
  • MEMBER
  • 11 POSTS
it has a 351 5.4 liter gas engine. Thanks again
Jan 27, 2010 at 1:17 PM
Avatar
2CARPRO JACK
  • CERTIFIED EXPERT
  • 11,533 POSTS
In the fuse/relay box (left side of dash) is the relay for thePCM (Powertrain ControlModule). This may be sticking or not receiving signal from the ign switch when you turn thekey on.Odd thing is that it wont start with OD light on. Try swapping this relay for another one to see if it makes the light stay off when key is cycled on.It is relay #C2160 (see pic)


https://www.2carpros.com/forum/automotive_pictures/1639_ford_6.jpg

Jan 28, 2010 at 7:55 AM
Avatar
TONY43
  • MEMBER
  • 11 POSTS
Thanks I'll try it now
Jan 28, 2010 at 12:58 PM
Avatar
TONY43
  • MEMBER
  • 11 POSTS
That did it. I replaced the PCM relay about an hour ago and started the truck about 20 times without a miss. I think that was the problem. I keep going out to start it again and again just to see and it starts every time. I appreciate your help very much and think the service you provide is priceless. Thanks again
Tony
Jan 28, 2010 at 2:49 PM
Avatar
2CARPRO JACK
  • CERTIFIED EXPERT
  • 11,533 POSTS
Whew!! Im glad that was it. Those trucks have alot of different electrical issues related to the GEM....
Jan 28, 2010 at 3:55 PM