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Fox 1/31/2020

2008 Chevrolet Suburban 1500 LTZ 8 Cyl 6.00L

Preventive Maintenance

Why does ONLY 1 daytime running light work??

I have seen brand new, and older suburbans that the driver side drl works but not the passenger side. Even AFTER REPLACING the bulb, its still the same. It seems this is a flaw in the suburbans. Like I stated, I've seen this in absolute brand new , older, and all year inbetween. Infact I've seen 14 suburbans today alone with that situation.
My friend has a 2018 suburban that has that same problem. Tried EVERYTHING possible, but to NO avail. 8 dealers have checked this out and all said this is how they are manufactured. Every other light on and inside the vehicle works, NO open shorts, or burned fuses/relays/bulbs. Socet tests dead, but wire to it has power. Tried reversing the socket from left to right, right to left. Same exact results.
Why are suburbans made like this??

1 Answer


Jimm 1/31/2020

The problem may be the "Daylight Running Lamp Module", try a reset of the module by pulling the "GAUGES" fuse in the Instrument Panel fuse block. Try to find the ground connection (black wire) for the DRL Module, bad grounds can cause some weird symptoms. Check the emergency brake switch and it's ground connection.

In general, the bulb socket usually has failed / burned - very common flaw on GM products DRLs.
Sometimes the socket becomes so melted it will not hold a new replacement 3157 bulb. In other scenarios you might only see slight damage as the lamp socket resembles a yellowish or off-white color. These sockets all need replacing with new parts. Obviously, if it's melted to the point where it won't hold the bulb properly, you'll have intermittent operation over bumps. However, even if it just looks yellowish this is a sign the socket has become brittle and additional problems are heading your way.

The socket must typically be replaced with a new one when this happens. Try these various on-line parts vendors; www.autopartsanything.com, www.rockauto.com, www.partsgeek.com - to list only a few.

In fact, they (RockAuto) list the headlamp socket from around $3.60 each for your vehicle.

Headlamp socket = DORMAN part #645995 - or it's equivalent


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