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  #1  
Old 05-23-2019, 12:13 PM
Razzmatazz Razzmatazz is offline
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Join Date: May 2019
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Default Check engine light on & O/D light flashing

2003 Ranger 6 cyl 3.0 Flex auto trans

So my check engine light came on the other day, and I've noticed my O/D light flashing every once in a while. Usually when it's in park and idling. It'll flash a few times then stop. Not noticing any rough shifting or slipping. Any ideas? Could these be related?
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Old 05-24-2019, 01:21 AM
Dirtman Dirtman is offline
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Default Re: Check engine light on & O/D light flashing

Yes. The od off light flashing means there is a transmission related trouble code, when it happens long enough it turns the check engine light on. Have the truck scanned and find out what the code is.
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Old 05-24-2019, 11:16 AM
Razzmatazz Razzmatazz is offline
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Default Re: Check engine light on & O/D light flashing

Scanned it yesterdy, came up with a code P0708. And according to enginrecodes.com...

P0708 FORD - Transmission Range Sensor Circuit High Input

Possible causes
Faulty Park/neutral position switch
Misadjusted park/neutral position switch
Park/neutral position switch harness is open or shorted
Park/neutral position switch circuit poor electrical connection


Not really sure how big of a deal that is, or how difficult it would be to fix.
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Old 05-24-2019, 04:36 PM
Dirtman Dirtman is offline
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Default Re: Check engine light on & O/D light flashing

A bad digital range sensor can start causing other issues including shifting issues or getting stuck in limp mode so definitely get it fixed. It's bolted onto the side of the transmission where the shift linkage is. They are cheap enough that I would just replace it. They do need to be properly adjusted when re-installing. Ford makes a special tool to do this but it can be done without it fairly easily. Then there is a specific procedure for re-attaching the shifter cable. But its not a difficult job at all.
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Last edited by Dirtman; 05-24-2019 at 04:41 PM.
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  #5  
Old 05-24-2019, 05:45 PM
zpn_by zpn_by is offline
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Default Re: Check engine light on & O/D light flashing

Had a similar problem with my 4R70W in my 94 Cougar. I was doing 50+ mph and it suddenly downshifted to second gear - it certainly got my attention. Turns out the transmission ECU thought it had been shifted to 2 and complied . Best bet, get it fixed quick. That downshift could have made my rear end skid out if it happened when I was taking a corner or if the road was wet. If Id been going faster it could have blown the transmission or engine.
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  #6  
Old 05-30-2019, 12:24 PM
Razzmatazz Razzmatazz is offline
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Default Re: Check engine light on & O/D light flashing

Does this look like the right part? Not a very detailed description, but it looks like the part I found at auto zone.

https://www.fordpartsgiant.com/parts...-7f293-aa.html


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Old 05-30-2019, 01:48 PM
Dirtman Dirtman is offline
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Default Re: Check engine light on & O/D light flashing

Thats it. But its about 20 bucks cheaper on amazon.

https://www.amazon.com/Standard-Moto...09+Ford+Ranger
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