Rad-in-Cal
Member
My 2005 XLS is having transmission problems. There is major slipping going on in low gear and starting out. I changed the filter and that didn't improve the situation. Now the "O/D Off" light is flashing.
O/D Off light flashing
- Thread starter Rad-in-Cal
- Start date
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Ssimmons
Member
Is your check engine light on?
OP
OP
Rad-in-Cal
Member
No, and the O/D light flashes intermittently.
Ssimmons
Member
Are you sure it's slipping? I ask because i had the same problem with my motorhome and what it was doing was actually pulling off in second gear instead of first. Try pulling codes on it and see what you get. If the O/D light is flashing there is a code in the ecm. mine was showing a code P0720 and this was the fix for it
http://www.thedieselstop.com/faq/9497faq/tsb/tsb/files/021103.pdf
stamp11127
Full Access Members
If you can get the trans codes read that will give you an idea of what the trans trouble is. I would expect a trans rebuild/replacement if the mileage is high.
AbelNavyvet
Full Access Members
There is 2 sensors on the Tyranny's drivers side, this has happened to me before if I'm not mistaken its the Speed sensor (VSS)
AbelNavyvet
Full Access Members
IF its not the sensors its the converter. don't drive it if it makes your tranny over heat.
DarrinBC
Full Access Members
That's not good. What's going on is that the computer is seeing the output shaft turn at a speed that isn't correct for the commanded gear. Could be from excessive slippage, an electronic or sensor issue, or it could be from the transmission starting out in the wrong gear.
The 2 sensors on the side of the transmission are the TSS (turbine shaft sensor) in the front and the OSS (output shaft sensor) in the rear. The computer takes the input from those sensors and compares that to the engine speed and expected torque converter slippage to determine if everything is working properly.
Obviously in your case it is not working properly. So what you need to find out is if the engine rpms are too high or too low for the commanded gear. Both can feel like slippage unless you are very familiar with what you are dealing with.
Too high an rpm for the commanded gear is bad.
D
I would say too high an RPM -- the revs will spike when the trans attempts to shift, like a delayed shift or going into neutral, and there is little acceleration. The truck accelerates slowly. Once it shifts into 3rd, it seems fine.
I'm assuming the sensors are ok or I'd expect something like an out of range code. Should I expect any telltale signs if I drop the pan?
I'm assuming the sensors are ok or I'd expect something like an out of range code. Should I expect any telltale signs if I drop the pan?
Last edited:
DarrinBC
Full Access Members
I think you will be able to tell a lot from dropping the pan. Post up your results.
D
D
AbelNavyvet
Full Access Members
you need to change the sensors if not the converter.. That recently happened to me. the sensors are throwing off your speed and this is going to result in a very expensive overhaul.
DarrinBC
Full Access Members
Sensors won't cause it to slip though. If he's truly seeing higher rpm in gear, meaning slippage, then he's got bigger issues.
Cheapest and most straightforward path is to drop the pan and check out the fluid. It likely could use a fluid change anyway. But even if the fluid is new, you can still catch it in a pan and re-use it. I do it all the time installing modified valve body kits. Hardly lose a drop.
D
Cheapest and most straightforward path is to drop the pan and check out the fluid. It likely could use a fluid change anyway. But even if the fluid is new, you can still catch it in a pan and re-use it. I do it all the time installing modified valve body kits. Hardly lose a drop.
D
I bit the bullet and decided to take it in as I would have expected some kind of electrical-oriented code if it was a bad sensor or solenoid (which I didn't get) and I have limited code reading with my scanner.
Sounds like the tech got a code for the forward clutch piston so he dropped the pan and everything looks clean. So I'm likely heading towards an overhaul on it.
Sounds like the tech got a code for the forward clutch piston so he dropped the pan and everything looks clean. So I'm likely heading towards an overhaul on it.
AbelNavyvet
Full Access Members
OVERHAUL it, I would suggest installing a Sure Cure Kit from Sonnax and a HUGE cooler. if you want to go even further install a huge oil pan as well if you can of course!
Thanks for the feedback guys. I ended up taking the truck to a private shop after vomiting at the dealer prices.
The Forward drum was cracked -- apparently a common problem, but not surprising given it cracked where there's a pressed notch among each spline. Cracked circumferentially at the notches. Reverse band was starting to wear, OD band was worn.
Replaced converter, seals/rings, filter, bushings, OD and reverse bands, EPC solenoid (just in case), and clutches.
Runs good now.
The Forward drum was cracked -- apparently a common problem, but not surprising given it cracked where there's a pressed notch among each spline. Cracked circumferentially at the notches. Reverse band was starting to wear, OD band was worn.
Replaced converter, seals/rings, filter, bushings, OD and reverse bands, EPC solenoid (just in case), and clutches.
Runs good now.
DarrinBC
Full Access Members
Ionizer12
Member
Having a similar problem in my 06. OD light flashing and it is sluggish accelerating in first gear, beyond that it's fine. Took it to get the codes run and it's. Showing the first gear ratio code I think the p0731. Replaced the rear speed sensor but didn't change anything. The aamco I went to to get codes run said the their was low pressure? It's not having any hard shifts just that problem engaging first. Scared of the price of the rebuild and hoping someone here might have had a similar issue and possibly a cheaper repair route but gut feeling is I need an overhaul. Any thoughts?
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