I want to replace the left rear turn signal bulb on a 2006 Chevy Uplander

Probably need to replace the multifunction switch.

Sounds like a bad turn signal switch. I bet if you wiggle the turn signal lever while you have your foot on the brake pedal the left and right brake lights ill intermittently work.

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could be a loose ground wire

1. check your turn signal light bulbs to see if one is burned out or partly burned out. One filament may be broken. Do it with lights on and off. Check brake lights. If one not working that is the problem bulb. Check front and back lights.

2. replace your turn signal flashers in fuse panel

What are all of your symptoms?
1 bulb or all?
Front and back?
Help us help you.....
Dean

Doesn't have a flasher , the BCM - body control module turns the turn signals on an off .
Turn Signal Lamps
The STOP/TURN fuse in the instrument panel (I/P) fuse block supplies battery positive voltage to the body control module (BCM) for the turn signal lamps. When the turn switch is placed in the left or right position, ground is applied to the BCM on the left or right turn signal switch signal circuit. The BCM then applies voltage to the appropriate front and rear supply voltage circuits.
Grounds for the various lamps are as follows:
• G100 supplies the right front lamps
• G101 supplies the left front lamps
• G400 supplies the right rear lamps
• G401 supplies the left rear lamps

If the front signal is blinking fast then theres a bulb out, check the rear to see if theres a bulb out, use the right side to see how many light are blinking and make sure the same is on the left, the main reason for fast blinking signal is a bulb is out on that side. good luck, have a nice day.

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Park and Turn Signal and Daytime Running Lamp Nuts (Qty: 3)

Tip

Disconnect the forward lamp harness connector from the lamp socket

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Regards, Lee Davidian

You will need a star bit. It is similar to an allen wrench but shaped like a star and attaches to a socket wrench

check your left light fixture.make sure you have a good contact.sometimes they burnout