Tl* the contact owns a 2007 Cadillac dts. The contact stated that the rear window brake light had fractured. The vehicle was taken to an independent mechanic for repairs, but the failure recurred. The manufacturer was contacted and advised the contact to call NHTSA. The vehicle was not diagnosed or repaired. The failure mileage was 69,193.
2007 Cadillac DTS lighting problems
moderate 10 complaints filed with NHTSA · avg repair $250 · see lighting across all vehicles →
Failure mileage
Complaints
10
Recalls
0
Avg fix
$250
When does it fail?
Of the 10 lighting complaints filed for the 2007 Cadillac DTS, here's the actual mileage breakdown — failures cluster heaviest at 50,000-75,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
No new NHTSA lighting complaint has been filed on this vehicle in over 7 years — the issue may be aging out of the active population.
The failure pattern owners describe
Buyer takeaway: The 2007 DTS has widespread lighting failures including HID ballast water intrusion, lens clouding, corrosion, and erratic automatic headlight control—all creating serious safety hazards. Repair costs run $350–$850+ per issue, with GM often unwilling to cover defects after the warranty period ends.
Owners consistently report HID headlight ballasts failing from water intrusion into the assembly, causing flickering and complete loss of illumination—sometimes both lights at once on dark roads. These failures occur as early as 27,000 miles. Replacement runs roughly $850 per ballast at the dealer. Multiple owners also describe headlight lens clouding that severely reduces light output and costs over $350 to fix—neither covered under warranty.
Corrosion inside the headlight assemblies forces sequential left and right replacements; GM has issued TSB Document ID #08014A acknowledging the defect. The automatic twilight sensor malfunctions, turning headlights on too early and off too late, which dims the dash so badly owners can't read their speedometer in daylight.
The rear trunk-mounted third brake light fractures and works intermittently without predictable pattern. One failed after independent repair and recurred. When contacted, GM directed the owner to NHTSA rather than address the defect. Dealer responses range from refusing warranty coverage to declining to coordinate goodwill repairs with GM. Owners note this is a widespread issue affecting the 2007–2012 DTS generation.
Same Cadillac DTS lighting reports on nearby years: 2006
Failure modes owners describe
HID Ballast Failure
Water intrusion into the headlight assembly backs down into the ballast, causing complete failure of one or both HID headlights. Owners report intermittent flickering followed by loss of illumination.
When: 27,000–78,000 miles; ballast failures noted early in ownership
Symptoms owners cite: One or both HID headlights flicker then extinguish while driving; Lights may briefly restore after power cycle (switching automatic control off/on); Failures recur frequently; Both headlights can fail simultaneously on dark roads
Repairs/costs cited: Ballast replacement approximately $850 per side at dealer; some owners had entire headlight assemblies replaced per dealer diagnosis
Recalls/TSBs owners mention: TSB available; GM contacted in at least one case and offered to cover 50% of repair costs; dealer unwilling to coordinate with GM on goodwill repair
Headlight Lens Clouding/Discoloration
Lens covering becomes clouded and discolored, reducing light output effectiveness. Multiple owners report the same defect at dealerships.
When: Not specified; reported under warranty
Symptoms owners cite: Lens visibly cloudy and discolored; Significantly reduced headlight effectiveness through degraded lens
Repairs/costs cited: Lens replacement cost over $350; not covered under warranty per dealer
Headlight Assembly Corrosion
Internal corrosion of headlight assemblies, requiring replacement of left and right units in succession. GM TSB Document ID #08014A addresses the problem.
When: Approximately one month apart; occurs early enough to require sequential replacements
Symptoms owners cite: Headlight assembly failure due to corrosion; Both left and right assemblies affected in same vehicle
Repairs/costs cited: Complete headlight assembly replacement required for each failed side
Recalls/TSBs owners mention: TSB Document ID #08014A issued by Cadillac addressing corrosion in headlights
Twilight Sensor Malfunction
Automatic headlight sensor activates and deactivates at inappropriate times—coming on too early and turning off too late. This causes interior dash illumination to dim during daylight hours when sunlight still requires sunglasses, making instrument cluster unreadable.
When: Not specified
Symptoms owners cite: Headlamps activate too early in evening/twilight conditions; Headlamps remain on too late into daylight hours; Interior dash illumination dims excessively during daytime; Driver cannot reliably read instrument panel speedometer and gauges
Repairs/costs cited: Dealer inspection performed but no repair accomplished; issue persists
Rear Window Brake Light Fracture
Third brake light lens on rear trunk window fractured. Failure recurred even after independent repair attempt.
When: 69,193 miles
Symptoms owners cite: Rear window brake light fractured
Repairs/costs cited: Independent mechanic repair did not resolve; failure recurred
Recalls/TSBs owners mention: Manufacturer directed owner to contact NHTSA; no diagnosis or repair provided
Third Brake Light Intermittent Operation
Trunk-mounted third brake light operates intermittently—functioning sporadically and then stopping without pattern. Described by owner as factory defect affecting all DTS model years 2007–2012.
When: Ongoing throughout vehicle operation
Symptoms owners cite: Third brake light works intermittently; Light stops illuminating without predictable pattern
Synthesized from 10 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 2 most recent
The left headlamp assembly had to be replaced due to corrosion. Approximately a month later the right headlamp had to be replaced for the same reason. I have subsequently have learned that Cadillac put out a bulletin, document id #08014a, that addresses the problem with corrosion in the headlights. If the headlights failed out at night, in the rain, clearly it is a safety issue.
Had lighting trouble with your 2007 Cadillac DTS?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the lighting problem on the 2007 Cadillac DTS?
It's a documented issue but not catastrophic. 10 complaints have been filed. Repairs average $250 and most owners catch it before it causes a breakdown.
At what mileage does the lighting typically fail?
Across the 10 complaints that reported odometer mileage, most lighting failures cluster between 50,000 and 70,000 miles, with the median around 68,258. A quarter of owners report trouble before 50,000; a quarter make it past 70,000. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $250 for lighting repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to lighting?
No active recalls currently cover lighting issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2007/Cadillac/DTS.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.