I have a 2005 Cadillac STS that displays "Speed Limited to 80mph" Code reads "left rear actuator"...what is the fix for this??

Videos and text based articles. They are nearly always to the left and right of the centre console under the dash.

https://www.google.com/search?q=1994+cadillac+seville+sts+replace+blend+door+actuator

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private sale or from a used car lot if from lot call and advise should have a limited warranty ---if private call and ask about non start --try to get vehicle scanned and check for any codes previous may have cleared codes to make sale --check fuses/relays -if have starter fluid give shot if starts check fuel pump -possible fuel filter-if pump good will need to check ignition system ,check for spark,and or certain sensors like the crank position sensor------- the following post is from caddyinfo forum Subject: Multiple Electrical System Malfunctions, Engine Will Not Start, Engine Will Not Shutdown, IP Gauges/Lighting Inoperative, Radio Inoperative, HVAC Display Erratic, Loss of Rear Door Functions (Inspect Both Rear Door Harnesses and Repair, if Necessary)
Models: 2005 Cadillac STS
Built Between and Including VIN Breakpoints 50112423 and 50133076
Attention: This inspection should be performed on all vehicles currently in your inventory prior to sale or delivery.
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Condition
Some customers may comment on one or more of the following conditions:
• Engine Will Not Start
• Engine Will Not Shutdown
• IP Gauges/Lighting Inoperative
• Radio Inoperative
• HVAC Display Erratic
• Loss of Rear Door Window/Lock Functions
These conditions may occur intermittently.
Cause
These conditions may be caused from the rear door wiring harness being misrouted causing the harness to contact the metal door bracket. This contact may cause a rub through to the wires enclosed in that harness.
Correction
Inspect both rear door wiring harnesses. Repair any damaged wires and reroute harness to correct location. Use the procedure listed below.
Make sure the ignition is off.
Remove both the rear door trim panels. Refer to the Side Rear Door Trim Panel Replacement procedure in the Doors sub-section of the Service Manual (SI Document ID #1465575).
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2005 STS electrical problem NO START

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The fuse is located under the rear seat in the fuse box.Trunk/valet fuse.

Speed sensor

Check for power at the light socket aswell as grounds

If the check engine light is on, there is a problem that the computer has detected and it needs to be fixed first. Once the proper repair(s) have been made you can use a code reader that has the ability to "reset" the light. You could also just disconnect the battery for 15 minutes. If the problem hasen't been fixed the light will come back on.

You have to remove the door panel and locate the actuator then remove the bolts holding it in and make sure to disconnect the electrical connector at the actuator reinstall the new one and you should be good to go.

the problem is in main brain dodge vans have the same problems. you need a tech to read code on glitch

THE 2 WARNING ARE RELATEDM U HAVE SOMETHING DAMAGED OR DEFETIVE IN THE TRACTION CONTROL SYSTEM, U NEED TO GO TO A FRONT END SHOP AND HAVE AN INSPECTION DONE.