The front and rear light bulbs are prone to premature failure. Our technicians tell us that the front bulbs can be very difficult to replace.Google+
Car Problem Reports
Cadillac CTS Front and Rear Light Bulbs may Fail
Cadillac CTS Problem
Average Mileage: 77,108 mi (50,000 mi - 125,000 mi)
Had to replace mine. I went to a auto parts store and bought mine, and had them replaced for about $400-$500 for both. At the dealer one headlight bulb is $500 each. To replace them the front bumper has to come off no other way to get to the front headlights.
Visitor, 2004 Cadillac CTS, 102,000 mi
Driver's side rear light melted into light socket. Picked up a replacement at AutoZone for $34. Now passenger turn signal light has gone out. The top of each head light cover is discolored, it looks like a heat related effect on the top of each sealed plastic cover.
Visitor, 2005 Cadillac CTS, 50,000 mi
the front right turn signal will fail for a week work the next week then fail again for god knows how long.
Visitor, 2006 Cadillac CTS, 73,000 mi
changed out LH brake light 3 times and RH brk lt 2 tms in 4 yrs. Possible wiring issue?
Visitor, 2005 Cadillac CTS, 60,000 mi
Rear driver side brake light has gone out approximately 4 times in 2 1/2 years.
rear bulbs have gone a few times and only had the car for 1 year.