When in park car wants to roll

Hi,

Are you able to drive the vehicle? I need to know that to confirm it isn't a broken CV/axle joint. If not, it sounds like there is an issue with what is called the range selector cable and the vehicle isn't actually shifting into park. The first thing I suggest is to try and adjust the cable.

Here are the directions for adjustment. If this doesn't help, the cable may need replaced or there may be an issue with the range sensor itself.

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2003 Buick Regal V6-3.8L SC VIN 1
Range Selector Cable Adjustment
Vehicle Transmission and Drivetrain Automatic Transmission/Transaxle Shift Linkage Shift Cable Adjustments Range Selector Cable Adjustment
RANGE SELECTOR CABLE ADJUSTMENT
Automatic Transmission Range Selector Cable Adjustment

Caution: The automatic transaxle range selector cable is made out of two cable sections. After initial connection never separate the two metal couplings from one another. Integrity of the connection of the two metal couplings will be lost if separation of the two metal couplings occurs. When servicing the transaxle remove the cable at the automatic transaxle range selector lever and at the automatic transaxle range selector cable bracket. If either section of the cable needs to be replaced, replace both of the cable sections. Loss of connection integrity of the two metal couplings can cause loss of transaxle shift control which could result in personal injury.

Notice: Adjust the automatic transaxle range selector cable while the transaxle and while the gear selector are in the Neutral position only. Failure to do so may cause mix-adjustment.

Pic 1

1. Set the parking brake.
2. Block the wheels.
3. Disconnect the shift cables at both ends with the system in Neutral.

Notice: Do NOT attempt to separate the metal couplings. Replace both cable pieces if the metal couplings are separated. Both of the cable section will be damaged if the two metal couplings are disconnected.

4. Push up to the adjustment position to release the adjuster until the cable housings separate.
5. Depress the adjuster clip once. This mobilizes the adjuster housing toward the transaxle end fitting.
6. Line up the end fittings so they slide together until you feel the parts cam together and lock.
7. Depress the adjuster clip completely. This locks the cable into its adjusted service position.
8. Pull the conduit in the opposite direction to assure full system adjustment of the shift cable.

Important: The horseshoe clip with the tab is flush when fully engaged.

Pic 2

9. Ensure the conduit is fully engaged.

Pic 3

10. The horseshoe clip with the tab is not flush when not fully engaged.
11. Install the shift cable retainer and the wiring harness clip or wiring harness strap.

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Let me know if this helps and I need to know if the vehicle is still drivable?

Joe

It sounds like you may have broken axle. Take a look through this link that explains what a CV axle is. There are two on your vehicle. There is one on each side of the vehicle.

https://www.2carpros.com/articles/how-a-cv-joint-works

If you look at the first attached picture, I circled the two places the joints are located on the axle. If one of these broke, it will cause what you are experiencing. In pic 2, I circled the axle so you can see location. It is behind the front wheel and goes to the transmission.

Check both of these on both sides of the vehicle.. Let me know if one is loose, or have a helper place the vehicle in reverse while you safely watch to see if one is turning and not moving the vehicle.

Let me know.

Joe