I have a 97 GLE --SEL came on and codes are
05/04(Auto Trasmission Comtrol Unit Signal(TCU) to ECU)

01/04(Vehicle SPeed Sensor)

--Are these serious problems that need to be fixed pronto?

Any info appreciated--Thanks (Jon)

 

man i have the same problem, and no one is helping

 

holla @ kevlo 911 pm him
he should be able to help you.

 

Here is a description of the trouble code from the ECU sticky:

0504

Diagnostic Trouble Code 0504 points to a problem with the Automatic Transmission Communications line. Pulse signals are exchanged between the Engine Control Module and the Transmission Control Module to assure smooth shifting during hard acceleration or deceleration.

This malfunction is detected when the ECM continuously receives an incorrect voltage from the TCM. Possible causes include...
- Harness or connectors (The communications line circuit between the ECM and the TCM is open or shorted.)
- TCM
- Discharged or faulty battery


0104
Diagnostic Trouble Code 0104 points to a problem with the Vehicle Speed Sensor or the associated wiring.

The Vehicle Speed Sensor installed on the transaxle. The part inside the transaxle has a plastic gear which is driven by the internal parts of the transaxle. The part outside is a signal generator which produces a square wave of amplitude 5.2 volts and frequency proportional to vehicle speed.

Remove the VSS, attach a voltmeter to the electric leads, and spin the gear
by hand. If you get zero volts, it's dead.

One owner discovered his VSS was not fully seated in the transaxle. He just tapped it inward, and retightened the 10mm mounting bolt.

For more information please refer to the Chilton repair manual (page 4-22) or the Haynes repair manual (page 6-16).

I would start by testing out the VSS - possibly a bad VSS is sending a faulty signal to the TCM - which in turn is sending an invalid signal to the ECU...

If the VSS checks out ok, check the harness between the TCM and the ECU. I can't help with the exact location of the harness or the pinouts...

Kevlo - any thoughts?

 

I have the same problem and still hasn't been able to fix it.
It's been two years since I got this code for the first time. Replacing the VSS is one way to go, but in my case it didn't fix the problem. New VSS, still 0104.
I suppose you won't have to worry too much about it if your cruise control works fine and you don't see any problem with your speedometer.