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Old 03-06-2011, 06:03 PM   #1
donrob42
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Default Would a bad PCM cause prevent transmission going in gear??

I have a 2000 Saturn SL1 with automatic transmission and I was just curious if anyone knew would a bad PCM prevent your car from shifting into any gear...including reverse??

I received some great info from several people yesterday about my tranny from another post but I failed to ask that question. I replaced the valve body with a new one and I tightened the input and output shaft nut and put new filter and fluid in but still I get nothing when I put the car in gear. I can hear what I think are the solenoids inside the valve body turning on for a second when I go from reverse to drive and back to reverse from drive. I let the car run for about 25 minutes and it seems like the fluid is circulating throughout the tranny because the transmission is warn on the bottom including the lines and the filter. One mechanic friend of mine is certain that the PCM is fried that controls the transmission but I don't know?? The car runs fine and I know the PCM also controls the engine. Just don't know if the car would run as good as it does and something is wrong with the PCM?? Help me out with some info if you can. Thanks!!

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Old 03-06-2011, 06:14 PM   #2
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Default Re: Would a bad PCM cause prevent transmission going in gear??

PCM failure is quite rare, almost unheard of. Have you checked the fuses in the fuse box, TRS-x there are 3 of them. Do you have any codes?

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Old 03-06-2011, 06:22 PM   #3
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Default Re: Would a bad PCM cause prevent transmission going in gear??

Quote:
Originally Posted by OldNuc View Post
PCM failure is quite rare, almost unheard of. Have you checked the fuses in the fuse box, TRS-x there are 3 of them. Do you have any codes?
I bought this car with the tranny problem because I got a good deal on it and I thought a new valve body would be the answer. The first thing I checked were those fuses and TRS 3/4 was burnt out. I replaced it and still nothing. so I went to plan B and put a new valve body in it. The fluid was really bad that I replaced and upon checking the old valve body that came out the tranny, 3 of the 5 solenoids were toast...one of them slightly melted on top. I don't have any codes because the battery was dead and I had to put a new one in the car. I assume the codes were erased due to the dead battery.

I have read that those PCM's are almost bullet proof but I guess anything is possible.

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Old 03-06-2011, 06:24 PM   #4
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Default Re: Would a bad PCM cause prevent transmission going in gear??

Do you have a voltmeter? If you do this will not take long....

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Old 03-06-2011, 06:30 PM   #5
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Default Re: Would a bad PCM cause prevent transmission going in gear??

This drawing of the connector on top of the trans. print it out. http://www.saturnfans.com/photos/sho...hp?photo=52370

Then with the transmission in park and the engine running check pins A, C, E, G, J one at a time to ground for 12v.

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Old 03-06-2011, 06:30 PM   #6
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Default Re: Would a bad PCM cause prevent transmission going in gear??

Quote:
Originally Posted by OldNuc View Post
Do you have a voltmeter? If you do this will not take long....
My next door neighbor says he's got a voltmeter and I could get it now if I need it....What do I need to do when I get it??

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Old 03-06-2011, 06:35 PM   #7
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Default Re: Would a bad PCM cause prevent transmission going in gear??

See the post right above yours. Need to find out if power is getting to the solenoids.

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Old 03-06-2011, 06:41 PM   #8
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Default Re: Would a bad PCM cause prevent transmission going in gear??

Quote:
Originally Posted by OldNuc View Post
See the post right above yours. Need to find out if power is getting to the solenoids.
OK...Will do. I will go get the voltmeter and perform the test and respond back. Thanks

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Old 03-06-2011, 06:44 PM   #9
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Default Re: Would a bad PCM cause prevent transmission going in gear??

OK, how black was the ATF in the transmission? Was it gritty?

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Old 03-06-2011, 07:33 PM   #10
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Default Re: Would a bad PCM cause prevent transmission going in gear??

Quote:
Originally Posted by OldNuc View Post
OK, how black was the ATF in the transmission? Was it gritty?
It was pretty dark and had that bad smell, but I didn't see any signs of grit or metal. I collected it all in a bucket and I took retractable magnet pointer and ran it through down to the bottom of the bucket. There were some fine filings stuck to the magnet but more than that.

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Old 03-06-2011, 07:36 PM   #11
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Default Re: Would a bad PCM cause prevent transmission going in gear??

Quote:
Originally Posted by donrob42 View Post
My next door neighbor says he's got a voltmeter and I could get it now if I need it....What do I need to do when I get it??
Unfortunately my neighbor counldn't find his voltmeter...the best he could do is a test light. Will that work?

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Old 03-06-2011, 07:41 PM   #12
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Default Re: Would a bad PCM cause prevent transmission going in gear??

If it is the kind that you put a clip on ground and then touch a probe to a connection and it lights up, yes. The idea is to find out if the 12v is actually available to operate the solenoids.

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Old 03-06-2011, 07:59 PM   #13
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Default Re: Would a bad PCM cause prevent transmission going in gear??

Quote:
Originally Posted by OldNuc View Post
If it is the kind that you put a clip on ground and then touch a probe to a connection and it lights up, yes. The idea is to find out if the 12v is actually available to operate the solenoids.
Yes, thats the one that he gave me...I will go do the test now.

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Old 03-06-2011, 08:31 PM   #14
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Default Re: Would a bad PCM cause prevent transmission going in gear??

Are you sure the tranny is not engaging, and it's not a broken axle shaft or CV joint? When you put it in Drive and give it gas, do you see any response on the speedometer?

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Old 03-06-2011, 08:36 PM   #15
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Default Re: Would a bad PCM cause prevent transmission going in gear??

Quote:
Originally Posted by OldNuc View Post
If it is the kind that you put a clip on ground and then touch a probe to a connection and it lights up, yes. The idea is to find out if the 12v is actually available to operate the solenoids.
I performed the test and all of the wires that I was suppose to test had voltage running to them.

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Old 03-06-2011, 08:40 PM   #16
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Default Re: Would a bad PCM cause prevent transmission going in gear??

Quote:
Originally Posted by madpogue View Post
Are you sure the tranny is not engaging, and it's not a broken axle shaft or CV joint? When you put it in Drive and give it gas, do you see any response on the speedometer?
It doesnt do anything when I put it in any gear. I can hear what I think is the solenoid turning on when I put it in drive or reverse but absolutely no movement of the car at all...My axles shafts are in place and connected as well as the CV joints.

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Old 03-06-2011, 08:41 PM   #17
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Default Re: Would a bad PCM cause prevent transmission going in gear??

That is good. Where did you get he replacement valve body and did you get a new connector plate. That sits on top of the solenoids.

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Old 03-06-2011, 08:47 PM   #18
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Default Re: Would a bad PCM cause prevent transmission going in gear??

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Originally Posted by OldNuc View Post
That is good. Where did you get he replacement valve body and did you get a new connector plate. That sits on top of the solenoids.
I got it from a place here in Atlanta called TPU. They are tops in Atlanta when it comes to anything for transmissions. The connector plate was new as well....Before I installed the valve body, I even opened the top part just to perform a power check on each solenoids to make sure they all worked. All 5 worked.

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Old 03-06-2011, 08:54 PM   #19
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Default Re: Would a bad PCM cause prevent transmission going in gear??

OK, good. Are all the various connectors by the filter in place? As madpouge asked does the speedometer indicate when you try it in drive?

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Old 03-06-2011, 09:03 PM   #20
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Default Re: Would a bad PCM cause prevent transmission going in gear??

Quote:
Originally Posted by OldNuc View Post
OK, good. Are all the various connectors by the filter in place? As madpouge asked does the speedometer indicate when you try it in drive?
I just went out to the garage and started the car and put it in gear and gave it some gas, but the speedometer reads 0 mph and does not move.

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