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2003 DHS says it's in 3rd gear. Won't start.


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1. Dashboard says it's in 3rd gear.

2. Column shifts fine. I do not have to apply the brakes to shift out of park.

3. The car will not start.

4. I thought maybe something was disconnected between the shifting cable and the transmission, however it is shifting fine because I cannot push it without shifting into neutral. 

5. When the key is off the lights will flicker, I have to turn the key on and back off to stop

6. When I turn the key to the on position, there is a humm coming from the stereo speakers.

 

I am at a loss any ideas?

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Bad battery or connections is the first thing that comes to mind

Under the back seat. 

Everything you describe sounds like a battery issue

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The Transmission selesct switch must be out of adjustment. I would check the battery and all the cables as @rockfangd suggested also.

THERE IS ALWAYS ENOUGH TIME TO DO THE JOB RIGHT - THERE IS NEVER ENOUGH TIME TO DO THE JOB AGAIN !!!

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Have you checked codes?

I am unsure about an 03, but if you are having difficulty with the PRD21 module a code will set.   I have been slammed before for commenting on newer models where changes have taken place, so hopefully someone will pop in who is more familiar with the O3, but check for codes that might be set.

Has any engine or transmission work been done recently?

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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This is real mystery.  Maybe as OldCadTech noted there is a problem the select switch cable or linkage is a problem.

This is the PRD21 shift module, I know for sure it was used through 99, it is approximately straight down from the EGR valve and has a cable attached to it.  When you move the shifter, this switch in turn moves.   Have someone move the shift lever while you watch this, it should move.

Let us know what you find.

Do the headlights light?, does the horn blow?

DSCN1366.JPG

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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It was the magnet that held the rod for the shift module. It somehow wore itself into about 4 pieces so because gm made the rod bending up, without the magnet it of course fell right out. Don't know why it wasn't bent the other way then no magnet would have even been necessary but im not a gm engineer. Anyhow guys thanks for the help. All fixed.

Edited by Easyrider8632
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