Mechanics

IS MY TRANNY GOING OUT OR IS IT COMPUTER PROBLEM?

2003 Saturn L300 • 103,000 miles

Bought this car about 6 months ago and everything was running fine. Then the ignition lock cylinder went out. Had it replaced now check engine light is on along with the wrench. Car shifts funny. Took it in to AAMCO to have it checked out and they pulled a lot of codes. P0604 P0716 P0717 P0742 P0751 P0752 P0756 P0757 U2105 P1815 P1816 P1817 P1818 P1834 P1842 P1847 P1860 P1887 P1795.
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Hermanj55
August 7, 2012.




Erase all codes drive see if light comes back on then recheck codes

Docfixit
Aug 7, 2012.
Already have done that and they are the same codes

Tiny
Hermanj55
Aug 7, 2012.
Well let me do some research 2.2L or 3.0L?

Docfixit
Aug 7, 2012.
Just to add to this one its a 3.0L if its a 2003 L300. Also thats a lot of codes did you check transmission wiring harness for animals chewing it acid from the battery damaging it?Also there is a couple of ground wires on the drivers side of engine below where there the intake tubes are. There not under the intake there in plain view some people leave them loose or dont hook them back up causing problems.

Saturntech9
Aug 7, 2012.
Hey saturntech9 what are your thoughts on codes P0604, U2105 and P1795?

Docfixit
Aug 7, 2012.
Mostly transmission codes. Check wiring harnesses and loose connectors.

KHLow2008
Aug 7, 2012.
The p0604 says to replace the transmission control module the diagnoses says clear the code if it comes back replace the computer. The P1795 is a commucation code as well as the U2105 that code there screams a computer went bad.I have seen bad ecms body control modules etc set that code. With all the codes and the three codes that docfixit mentioned I would replace the transmission computer and clear the codes and see which ones if any come back. With the code P0604 that means you have a bad transmission computer so there is nothing lost with replacing it.I wolud also inspect the wiring like I mentioned before. But that wont set the code P0604.

Saturntech9
Aug 7, 2012.
Thanks saturntech and KHLow thought ECM or TCM but not sure which one

Docfixit
Aug 8, 2012.
Your welcome docfixit anytime. Also its setting a code for a bad tcm and there is mostly transmission codes so I would start by replacing the tcm and inspecting the harness.
AD

Saturntech9
Aug 8, 2012.
Ok checked the wiring harness and ground wires and all are connected tightly and no chew marks. About how much does a tcm cost and where is it located at? Will it have to be reprogramed or is it plug and play.

Tiny
Hermanj55
Aug 8, 2012.

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