1994 SLS throwing P039

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1994 SLS throwing P039

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Cadillac >> General Technical Section >> Transmission Tech >> Automatic Transmissions >> 1994 SLS throwing P039

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1994 SLS throwing P039 - 11/11/2007 10:53:40 PM

khanawalt

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I did a quick search and didn't find pertinent information on this. The TCC is not locking up, and sets the check engine light and P039. Is this likely to be a simple solenoid or will it likely need to be pulled to fix it? It's got 165K.

I just bought the car with a bad rack & pinion, so I couldn't drive it until I replaced the rack yesterday so I don't know if the code was preexisting. I did notice it didn't lock up on the drive home before I fixed it.

Thanks.

< Message edited by khanawalt -- 11/11/2007 11:05:09 PM >

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''''99 STS, ''''94 SLS

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RE: 1994 SLS throwing P039 - 11/12/2007 7:15:44 PM

slowroll

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You can hope soleniod will fix it but you will likely need torque converter also. You could have other worn parts causing internal leakage.

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RE: 1994 SLS throwing P039 - 11/12/2007 8:21:49 PM

khanawalt

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It's shifting fine, running well, I suppose I can just drive it this way until it starts acting up, right?

_____________________________

''''99 STS, ''''94 SLS

Life is hard. It''''s harder if you''''re stupid.

(in reply to slowroll)

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RE: 1994 SLS throwing P039 - 11/12/2007 8:26:49 PM

slowroll

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Yes, code will normally set when trans is hot, 1 hour or more of driving.

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RE: 1994 SLS throwing P039 - 11/12/2007 8:31:47 PM

khanawalt

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quote:

ORIGINAL: slowroll

code will normally set when trans is hot, 1 hour or more of driving.

Code will set, or reset? If driving around town it won't set, I assume because the speeds are too slow for it to try and lock the converter. As soon as I get near highway speeds, it sets cold or hot.

I will do a transmission service soon. I read something in another thread that adding a half-quart of Type F tranny fluid will help the TCC to resist slipping, but mine doesn't even feel like it's trying to lock up. Thanks for your help.

< Message edited by khanawalt -- 11/12/2007 8:46:40 PM >

_____________________________

''''99 STS, ''''94 SLS

Life is hard. It''''s harder if you''''re stupid.

(in reply to slowroll)

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RE: 1994 SLS throwing P039 - 12/7/2007 1:15:47 AM

khanawalt

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After driving the car for a couple of weeks, I've noticed that when the service engine soon light comes on, the revs increase slightly. I guess that means that the TCC is trying to lock up, but is not solid. It doesn't feel locked up when the light is off, so maybe the clutch is just bad. I'll do a service and put in a little Type F and see if that helps any.

I suppose the PCM unlocks the clutch if it detects slipping in order to keep it from shredding itself and pouring crap into the oil.

_____________________________

''''99 STS, ''''94 SLS

Life is hard. It''''s harder if you''''re stupid.

(in reply to khanawalt)

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