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Is the shift lever returning fully to the park position? When you turn the key off as far as you can, does the shifter lock in park? I am questioning of the shift lock cable is out of adjustment or damaged. Take a look through these directions for removal and replacement of the cable. Check to see if anything is loose or damaged.
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The attached pictures correlate with these directions.
SHIFT LOCK CABLE
Shift Lock Cable
1. Set ignition key in "LOCK" position and selector lever in "P" position.
2. Remove knee pads, cluster upper cover, center cluster assembly, rear console, and front console.
Picture 1
3. Disconnect inner cable from selector lever assembly then push claw and disconnect cable assembly.
Picture 2
4. Disconnect lock adjust.
5. Remove instrument panel lower cover and steering column cover.
Picture 3
6. Remove spring pin and disconnect inner cable.
Disconnect outer cable from bracket.
Installation
1. Set ignition key in "LOCK" position and selector lever in "P" position.
2. Connect outer cable to bracket near steering lock.
Connect inner cable to steering lock and install spring pin.
3. Install steering column cover and instrument lower cover.
Picture 4
4. Install adjust body of cable assembly to bracket in selector lever assembly.
Install inner cable to lever, pulling inner cable with outer cable.
5. Check that cable moves smoothly, lightly pulling outer cable rearward.
Picture 5
6. Connect lock adjust, aligning "T" mark in the "P" position.
7. About following installation steps, refer to Selector Lever.
8. Check the shift lock operation:
a. Selector lever should not be moved out of "P" position with ignition key in "Lock" position.
B. Selector lever can be moved out of "P" position with ignition key in "ON" position only when brake pedal is depressed.
C. Ignition key can be turned to "LOCK" position only when selector lever is in "P" position (key can be pulled out).
9. If a. And c. Fail, readjust cable. If b. Fails, readjust connector wiring and brake pedal switch.
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If you are able to turn the key (other than into the lock position) it doesn't sound like an issue with the tumbler itself. I suspect the cable has been damaged and not allowing the key to turn fully to the lock position.
Let me know if this helps or if you have other questions.
Take care,
Joe
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Thursday, March 28th, 2019 AT 8:05 PM