Back to search

2007 CADILLAC DTS

4.6L V8 Northstar•FWD•AUTOMATIC•gas
Be the first sponsor for this vehicle

For $99, we generate the full set of step-by-step repair procedures for this exact vehicle. Free for everyone, forever, with your name on every one.

Sponsor — $99
Dead battery / stuck in Park? Emergency neutral procedure for this DTS →
5-Year Cost of Ownership
$33,531 maintenance + known platform issues
~$6,706/yr · 560¢/mile equivalent · $8,287 maintenance + $8,044 expected platform issues
Common Problems & Known Issues

The 2007 DTS with the 4.6L Northstar V8 is a comfortable highway cruiser plagued by catastrophic engine failures and transmission cooling issues that can strand owners unexpectedly. The Northstar's head bolt design and head gasket failures are legendary for ending these cars prematurely.

Northstar Head Gasket Failure / Head Bolt Pull-Out

Common · high severity
Typical onset: 80,000-130,000 mi
Symptoms: White smoke from exhaust on cold start, Coolant loss with no visible leaks, Overheating despite proper coolant level, Milky oil on dipstick or oil cap, External coolant seepage at head-to-block junction
Fix: Northstar engines use torque-to-yield head bolts threaded into aluminum block — bolts pull threads out under thermal cycling. Proper repair requires time-sert thread inserts in all 20 holes per side, new head gaskets, resurfacing heads. 18-24 hours labor. Many shops won't tackle it; owners often opt for used engine swap instead.
Estimated cost: $3,500-6,000

Transmission Oil Cooler Line Failure at Radiator

Common · high severity
Typical onset: 70,000-110,000 mi
Symptoms: Pink or strawberry milkshake appearance in coolant reservoir, Transmission slipping or erratic shifting after coolant contamination, Coolant in transmission pan during fluid service, Sudden transmission failure after mixing fluids
Fix: Internal transmission cooler in radiator fails, allowing coolant into ATF (or vice versa). Requires radiator replacement, transmission flush, often complete transmission overhaul if contamination progressed. 6-10 hours for radiator and flush; add 12-18 hours if transmission rebuild needed.
Estimated cost: $800-1,200 (cooler/flush only); $2,800-4,500 (if transmission damaged)

Engine Oil Consumption / Piston Ring Failure

Common · medium severity
Typical onset: 90,000-150,000 mi
Symptoms: Using 1+ quart of oil every 500-1,000 miles, Blue smoke on acceleration, Carbon buildup on spark plugs, Oil fouling on rear cylinders more common, No external leaks but constant low oil level
Fix: Northstar rings wear or carbon-lock in grooves due to heat and design. Proper fix is engine-out teardown, hone cylinders, new rings on all pistons. 20-28 hours labor. Most owners just add oil until something else fails.
Estimated cost: $4,000-6,500

Ignition Control Module / Coil Cassette Failure

Occasional · medium severity
Typical onset: 60,000-120,000 mi
Symptoms: Random misfires on multiple cylinders, No-start when hot, starts fine cold, Check engine light with P0300-P0308 codes, Stumbling or hesitation under load
Fix: Northstar uses two ignition cassettes (four coils each) that fail from heat exposure. Replace both cassettes preventively. 2.5-3.5 hours labor, must remove upper intake plenum.
Estimated cost: $800-1,400

Front Strut Mount Bearing Failure

Occasional · low severity
Typical onset: 80,000-130,000 mi
Symptoms: Clunking over bumps at low speed, Steering wheel not returning to center smoothly, Grinding or popping when turning at standstill, Uneven tire wear on front
Fix: Upper strut mount bearings wear out, especially in northern climates. Replace mounts and bearings with struts during suspension work. 3-4 hours labor for both sides with alignment.
Estimated cost: $600-1,000

Transmission Mount Collapse

Common · low severity
Typical onset: 70,000-120,000 mi
Symptoms: Clunk when shifting from Park to Drive/Reverse, Excessive vibration at idle in gear, Visible engine/trans movement when revving in Park
Fix: Hydraulic transmission mount fails, allowing excessive drivetrain movement. Simple replacement, 1.5-2 hours labor.
Estimated cost: $250-450
Owner tips
  • Check coolant level obsessively — Northstar overheating even once can warp heads beyond repair
  • Inspect radiator and transmission cooler lines annually; replace proactively at 80k miles to avoid trans contamination
  • Budget $500/year for oil consumption top-offs if buying high-mileage
  • Avoid any DTS with service records showing prior overheating or head gasket work — likely has compromised block threads
  • Run full synthetic oil and change every 4k miles to maximize ring life
Buy only if you find a pampered low-mileage example under $5k and budget for a Northstar grenade — otherwise, the Town Car is a better V8 luxury sedan bet.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
527 jobs across 17 categories
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.
Stuck on a repair? Take it to The Diag Desk — ask a master tech about this exact car → real human answer within 24h, never AI
Building an app?
Free API access to all this data — 20 requests/day, no card required.
Get an API key →
Run a shop?
Manage repairs, estimates, and customers with ShopBase — $249/mo, all features included. Built by the same team.
Try ShopBase →