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I GOT A 2001 DTS. I HAVE A PROBLEM WHEN IT RAIN THE TRANSMISSON WONT SHIFT OR SHIFTS HARD, I LOOSE MY SPEEDO. ONCE I PUT IT IN A HEATED GARAGE IT RUNS FINE. ANY ONE ELSE HAVE THAT PROBLEM OR NO WHERE I SHOULD START LOOKING? THANKS FOR THE HELP

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One reasonable start point is to display any Diagnostic Trouble Codes. Here's how;

http://www.caddyinfo.com/readingcodes.html

Report the codes back to this forum in this thread.

Observer (3-9 posts)

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Joined: Yesterday, 02:42 PM

Member No.: 11003

2001 DTS 4.9L OHV V8

Warn: (0%)

HI WE FOUND CODES P0502, P0621,P0719,P0741 BUT THEN WE CLEARED THEM AND RAN IT ON JACK STANDS NO CODES,BUT WON'T SHIFT AND NO SPEEDO. SPRAYED ELECTRICAL CLEANER ON ROUND CONNECTOR AND WHERE WIRES GO INTO TRANS. AND IT WORKED FOR A SECOND . WHERE DO THE WIRES GO ONCE THEY ENTER TRANS. CAN WE TAKE OFF SIDE COVER TO GET TO THEM. OR WHICH COLOR WIRES

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....WE CLEARED THEM AND RAN IT ON JACK STANDS
Please turn off your CAPS LOCK.

I'm surprised you did not report a double handfull of codes after "RAN IT ON JACK STANDS". Running the engine with the car in gear and front wheels off the ground has to the single most confusing situation for the traction control system. Traction control would be applying the brakes and the noise would be obvious.

SPRAYED ELECTRICAL CLEANER ON ROUND CONNECTOR AND WHERE WIRES GO INTO TRANS. AND IT WORKED FOR A SECOND .
Did you open the connector and spray the contact pins and sockets?

Jim

Drive your car.

Use your cell phone.

CHOOSE ONE !

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....WE CLEARED THEM AND RAN IT ON JACK STANDS
Please turn off your CAPS LOCK.

I'm surprised you did not report a double handfull of codes after "RAN IT ON JACK STANDS". Running the engine with the car in gear and front wheels off the ground has to the single most confusing situation for the traction control system. Traction control would be applying the brakes and the noise would be obvious.

SPRAYED ELECTRICAL CLEANER ON ROUND CONNECTOR AND WHERE WIRES GO INTO TRANS. AND IT WORKED FOR A SECOND .
Did you open the connector and spray the contact pins and sockets?

ya mad bad about the caps. i might be looking in the wrong spot i got no ideal. i did not spray them. do u know how far the wires go in to the tranny and if i can get to them

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....i did not spray them.
So you basically just washed the exterior shell of the connector. Get some contact cleaner on the pins and sockets; it might help.
....do u know how far the wires go in to the tranny and if i can get to them
There are many solenoids and sensors throughout the transmission. The only way to access all of the parts and pieces is with the transmission on the bench.

The codes you reported point to several different problem areas.

P0502 - Vehicle Speed Sensor (VSS) Circuit Low Input

The VSS sensor is located on top of the RH drive axle extention. Easy enough to check for a loose or dirty connector. And the sensor is not an expensive part.

P0719 - Brake Switch Circuit Low Input

This might indicate a brake pedal switch that is not operating properly or is not installed/adjusted properly. Does your cruise control work as expected?

P0741 - TCC System Stuck Off

Cleaning the pins and sockets in the transmission connector might fix this code. No guarantees on that one.

Jim

Drive your car.

Use your cell phone.

CHOOSE ONE !

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....i did not spray them.
So you basically just washed the exterior shell of the connector. Get some contact cleaner on the pins and sockets; it might help.
....do u know how far the wires go in to the tranny and if i can get to them
There are many solenoids and sensors throughout the transmission. The only way to access all of the parts and pieces is with the transmission on the bench.

The codes you reported point to several different problem areas.

P0502 - Vehicle Speed Sensor (VSS) Circuit Low Input

The VSS sensor is located on top of the RH drive axle extention. Easy enough to check for a loose or dirty connector. And the sensor is not an expensive part.

P0719 - Brake Switch Circuit Low Input

This might indicate a brake pedal switch that is not operating properly or is not installed/adjusted properly. Does your cruise control work as expected?

P0741 - TCC System Stuck Off

Cleaning the pins and sockets in the transmission connector might fix this code. No guarantees on that one.

now that i think about it when it rained and i hit a puddle on the right hand side is when it started. would the (vcc) make my speedo go crazy and not work.

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  • 1 year later...

Same problem here...

started just after installing an after market radio in a deviulle 2000, could it be rellated?

thanks

Give us more details than SAME PROBLEM HERE

What are your codes? What are you symptoms

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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code p0502, THE TRANSMISSON WONT SHIFT OR SHIFTS HARD, I LOOSE MY SPEEDO, started day after after market radio install..

P0502 - Vehicle Speed Sensor (VSS) Circuit Low Input

The VSS circuitry has been butchered.

?heard that when you take out the original radio...the electrical problems starts...??

And you have living proof.

Jim

Drive your car.

Use your cell phone.

CHOOSE ONE !

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I do not know what has been done or where, but in your words it "started day after after market radio install...". Connect the dots and the path leads right to the radio.

The VSS signal is used by many modules in the vehicle and the radio is one of those. Have them look for a damaged/cut dark green wire. Insulation damage allowing the VSS to touch a chassis ground point would kill the signal.

Jim

Drive your car.

Use your cell phone.

CHOOSE ONE !

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Ok, so my mechanic changed the sensor yesterday morning and so far so good, the car runs really smooth...

yeah! It's my first Caddy and i'm probably a little nervous and anxious... :unsure:

I'm glad it was only the VSS sensor..

Very odd that it went out at the same time the aftermarket radio was installed.

Thanks for reporting back on the fix for your problem.

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The PCM utilizes the VSS in the event that the ISS or Input Speed Sensor becomes defective. When my ISS sensor when bad, my transmission shifted rough. But the VSS is only used for your speedometer, I believe. It is not relied on for shifting or line pressure unless the ISS is out of order.

Why your transmission was shifting poorly with a bad VSS sensor is indictive to me that you MAY have an ISS speed sensor that is wacky. Do me a favor and pull your codes and look to see if you have an ISS code like P0715, P0716 or P0717 current or history.

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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ran the code meter...no code... only the EV icon flashing...yellow status.....

good?

What is the EV icon, what do you mean by that?

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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....But the VSS is only used for your speedometer, I believe.

Not so for the models in question, Mike. Cruise control and the radio and the PCM also receive the VSS signal.

If/when the PCM detects a difference between what the ISS is reporting and what the VSS is reporting (considering gear selected, engine RPM and other instantaneous variables), the PCM will put the transmission in high pressure mode for protection.

High pressure mode equals firm shifts.

Jim

Drive your car.

Use your cell phone.

CHOOSE ONE !

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Interesting, I am pretty sure that the 96 does not work that way, I have to get my manual working again, its annoying not to have it

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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