Hi,

This is indicating that the transmission is in safe mode... meaning electronic control of the transmission has been shut down and it is operating strictly on manual-valve operation (Park/Reverse/Neutral/3RD only).

Is the Service Engine Soon light on?
Does the "N" light flash?

Thanks

Thanks.

Before we can determine the repairs needed, we need to find out why the transmission is shutting down.
Ideally we would like to see what codes are stored in the transmission computer, however this is not always an option (most shops can not scan these... a trip to the dealer is often required).
For right now though, lets find out what is setting the Service Engine Soon light as it may be related to the transmission issue.

Do you have access to a code reader, or live near an auto parts store (Autozone, OReilly, etc) that can give you a free code scan?

Thanks... this is definitely a 2004 Galant, not a 2003 or older right?

Great, thanks.

Do you have a test light or meter, etc?

No problem.

As you probably already know this code is indicating a malfunction of the transmission control relay... this code will be set if there is no power received from the AT relay.

What we were going to do was check to see if we have two valid powers at the relay, however in the absence of a test light we can check the power supply fuses for the relay first.

Specifically, in the under hood fuse box we want to inspect fuse #15 (20A), and in the in dash fuse box we want to check fuse #22 (7.5A).

Check those two fuses to see if either are popped... if your fuse numbers don't match the amperages I gave you, let me know and I will get a fuse diagram for you (sometimes they change the numbers on the fuse box covers).

Alternately, if you would rather just have the test information to review at your leisure, let me know and I will retrieve the diagnostic information for you.

Thanks.

Have you verified if you can feel the AT relay clicking when you turn the key to on? Or instead, have you swapped the relay with an adjacent relay then cleared the code to see if it returns?

Thanks.

The code will need to be reset, it won't go out immediately.
The other area of concern is if a transmission code is set, it will need to be cleared as well, which would require a transmission compatible scan tool.... of course if this were the case we would expect to see a flashing N light (as well as additional internal problems).

In the absence of a scan tool/code reader, you can unhook the negative battery cable for 30 seconds and it should reset the light. The light should take four start-ups before it returns if the problem is still present. If the problem is internal to the transmission (requiring a transmission scan tool), you will still be stuck in safe mode.