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Old 02-16-2017, 09:46 PM   #1
DonnieDarko
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Default Incorrect Gear Ratio and System Voltage Low-Solenoids Good

My wife's late 90s SL2 is having trouble shifting in and out of 3rd. It's throwing the following codes:
P0733 Gear 3 Incorrect Ratio
P0562 System Voltage Low

Now, I've just pulled the valve body, and all the solenoids are testing good and close to each other (1st is 4.5 and the rest are 4.8-5). The connector to the valve body tested good, also. Would the input shaft nut cause just this only issue with the transmission? I am assuming 4th is still good, but I haven't personally tested it past that.

I thought the system voltage low was odd, as it seems to get electrical power fine; though it has been setting for a few weeks. According to the code, this could cause shifting issues.

It used to have the reverse slam, but seems to go very smoothly into reverse after a fluid change a while back.

It does have a major oil leak that I was going to track down once this transmission issue was fixed-perhaps the valve cover, but I don't actually know. There's a lot of oil on some wires.

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Old 02-16-2017, 10:09 PM   #2
OldNuc
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Default Re: Incorrect Gear Ratio and System Voltage Low-Solenoids Good

The P0562 code must be fixed before worrying about the transmission. Have battery and alternator tested. You have a major electrical problem.

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Old 02-16-2017, 11:07 PM   #3
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Default Re: Incorrect Gear Ratio and System Voltage Low-Solenoids Good

Are you losing trans fluid, having to add it often? How much, how frequently? Depending on your answers, you may want to check your diff pin to be sure it hasn't come loose too. If it has, that may be a consideration before putting time/money into anything else...

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Old 02-16-2017, 11:37 PM   #4
DonnieDarko
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Default Re: Incorrect Gear Ratio and System Voltage Low-Solenoids Good

Quote:
Originally Posted by OldNuc View Post
The P0562 code must be fixed before worrying about the transmission. Have battery and alternator tested. You have a major electrical problem.
I was afraid of that. I'll have them tested once I get the car back together.

Quote:
Are you losing trans fluid, having to add it often? How much, how frequently? Depending on your answers, you may want to check your diff pin to be sure it hasn't come loose too. If it has, that may be a consideration before putting time/money into anything else...
She said she just had to add some once fairly recently. She's had it for several years, but has probably only driven 15k miles total and a few thousand since the transmission fluid change.

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Old 02-17-2017, 09:09 AM   #5
OldNuc
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Default Re: Incorrect Gear Ratio and System Voltage Low-Solenoids Good

Diff pin failure is a catastrophic event and very rarely just a slow decrease in fluid level and a couple of gear codes. Low system voltage at values way above the 11v setpoint for a 562 code will result in trans failure to properly function. Any decent parts store can check the battery and alternator in place and provide a printout of results. To give you any valid advice the actual printout should be posted.

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Old 02-17-2017, 01:20 PM   #6
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Default Re: Incorrect Gear Ratio and System Voltage Low-Solenoids Good

I misread, sorry. I interpreted that "major oil leak" as being a trans leak.

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Old 02-17-2017, 08:18 PM   #7
OldNuc
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Default Re: Incorrect Gear Ratio and System Voltage Low-Solenoids Good

Source of oil undefined but not likely the trans.

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Old 02-17-2017, 09:10 PM   #8
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Default Re: Incorrect Gear Ratio and System Voltage Low-Solenoids Good

Quote:
Originally Posted by OldNuc View Post
Any decent parts store can check the battery and alternator in place and provide a printout of results. To give you any valid advice the actual printout should be posted.
Will do. It'll be next week before I have a chance to put it back together and head down there, though.

Quote:
Source of oil undefined but not likely the trans.
It's engine oil; it uses a lot of oil, but doesn't smoke.

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Old 02-19-2017, 10:45 PM   #9
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Default Re: Incorrect Gear Ratio and System Voltage Low-Solenoids Good

Quote:
Originally Posted by DonnieDarko View Post
It's engine oil; it uses a lot of oil, but doesn't smoke.
Get used to it. EVERY 1.9L uses a lot of oil. Every last one of them..

The oil control rings seize, and the oil literally cooks inside the cylinder. They won't start smoking until you are adding a quart, about ever 300 miles or less than 300. They will only smoke above 3,000rpm, then, too.

The areas that physically leak, are the valve covers on 1996-up. Thanks to the cheap plastic design, instead of the cast aluminum ones used on 1995-older, they warp and begin leaking(DOHC). The rear main seal can fail, as well as the timing cover to cylinder head mating surfaces.

Symptoms of a leaking valve cover are fairly easy to track: the spark plugs holes will usually have oil in them and the block is typically covered in dirt/grime.

The rear main seal may leave a drip or puddle on ground.

Pull spark plugs and check for oily plugs. If the plugs are oily, it is time to start planning the time to rebuild it.

...
1991 Pontiac Grand Am - 2.5L Iron Duke @ 137k, and making noisy rattles all day......
1995 Saturn SC2 - 1.9L DOHC 16v Twin Cam @ 167k, burning oil every step of the way.....

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Old 02-20-2017, 12:59 AM   #10
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Default Re: Incorrect Gear Ratio and System Voltage Low-Solenoids Good

Rear main only leaks when installed incorrectly. Seal carrier leaks sometimes and the pan-carrier seal leak is common.

Not every 1.9 burns oil, some are even still stock with undrilled pistons.

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