This service bulletin provides guidelines and diagnostic/repair information to technicians regarding vehicle engine oil consumption.
full bulletin at NHTSA ↗2006 Cadillac CTS engine problems
moderate 23 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Failure mileage
Complaints
23
Recalls
0
Avg fix
$3,100
What stands out
Among the 8 model years of Cadillac CTS in our records for engine problems, this one ranks #3 by owner-complaint volume.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering engine on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
This service bulletin advises of a new fuel injection cleaner kit used for decarbonizing the intake valves to correct conditions of rough idle, Crank no start, extended crank or misfire, MIL with DTCs, and explains how Top Tier fuels should be used to reduce carbon build-up.
full bulletin at NHTSA ↗This technical bulletin advises of a new fuel injection cleaner kit used for decarbonizing the intake valves to correct conditions of rough idle, Crank no start, extended crank or misfire, MIL with DTCs, and explains how Top Tier fuels should be used to reduce carbon build-up.
full bulletin at NHTSA ↗This service bulletin provides service information to technicians on guidelines to replace Oil Cooler, Oil Cooler Lines and Oil Tank if the engine was replaced where large amounts of debris has flowed throughout the oiling system.
full bulletin at NHTSA ↗This Warranty Admin service bulletin provides guidelines for Dealers Not Required and for Dealers Required to Contact the PQC for engine or transmission assembly replacement and explains the PQC process, GWM Transaction submission, vehicle service record retention and proper handling of assembly returns for Canadian Dealers only.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The 2006 Cadillac CTS engine failures cluster around four distinct problems. The most severe is timing chain stretch and failure. Multiple owners report the timing chain losing teeth or breaking outright—often around 60,000–70,000 miles, sometimes well before. When it happens, the vehicle stalls without warning at highway speeds (60–75 mph), and mechanics diagnose catastrophic engine damage requiring full replacement at costs exceeding $8,500. Owners point to primary chain tensioner wear as the root cause.
Excessive oil consumption is the second major issue. Owners report burning 1–2 quarts per 500–1,000 miles starting as early as 25,000 miles, with no visible leaks or smoke. Dealers tell some owners this meets Cadillac spec; owners dispute that claim. One owner heard engine knock develop after the oil level ran low.
Oil leaks from the pan and valve cover areas occur at 36,000–82,000 miles. Owners replace gaskets multiple times without stopping the leak; one replaced a water pump four separate times.
Engine stalling occurs mid-drive at various speeds (45–73 mph) with check engine lights illuminated. Mechanics diagnose timing issues, bad computers, or recommend full engine replacement. One owner experienced sudden loss of motive power at 73 mph with no restart; later diagnostics called for piston rod and crankshaft replacement.
Cooling-system issues—radiator fittings detaching and coolant leaks—appear alongside engine troubles.
Same Cadillac CTS engine reports on nearby years: 2005 · 2007 · 2008 · 2009
Failure modes owners describe
Timing chain stretch/failure
Timing chain loses teeth or breaks due to primary chain tensioner wear, causing loss of engine timing and catastrophic engine failure. Owners report crank gears jumping teeth.
When: 60,000–70,000 miles, sometimes earlier; one report at 175,000 miles
Symptoms owners cite: Vehicle stalls without warning while driving at highway speeds (60–75 mph); Check engine light illuminates; Engine shuddering and misfiring before stall; Sluggish driving performance; Vehicle fails to restart
Repairs/costs cited: Full engine replacement required; costs reported at $8,500. One owner quoted $1,500 for timing chain repair; tensioner wear identified as cause.
Excessive oil consumption
Engine burns oil at abnormally high rates with no visible leaks or smoke. Cadillac spec allegedly allows 1 quart per 500–1,000 miles; owners report this rate is not normal for comparable vehicles. One owner's engine developed knock after oil ran low.
When: Starts at 25,000–35,000 miles; persists through 150,000+ miles on same vehicle
Symptoms owners cite: Oil level drops rapidly between service intervals; No drips on ground; no visible leaks; No smoke from exhaust; Engine knock develops after prolonged low-oil operation; Oil blackens quickly after changes
Repairs/costs cited: One owner reported engine replacement recommended at 30,000 miles for excessive consumption; repair status unclear. No parts/costs cited by owners attempting repair.
Recalls/TSBs owners mention: Cadillac specification allows 1 quart per 500–1,000 miles (1 quart per 1,000 miles under normal driving). Dealers tested consumption rates but owners dispute this as normal.
Oil pan and valve cover leaks
Oil leaks from oil pan gasket and valve cover. One owner replaced valve cover but leak persisted; two mechanics separately confirmed oil pan gasket failure. Another owner's large oil puddle under engine required gasket replacement.
When: 36,500–82,000 miles
Symptoms owners cite: Large puddle or drips of oil on ground under engine; Oil spots on garage floor; Visible oil leaking from pan area
Repairs/costs cited: Valve cover replacement did not resolve leak; oil pan gasket replacement required. One owner cited estimate of $3,000 for replacement of two pans and gaskets; repair not completed.
Engine stall with no restart
Engine stalls suddenly during normal driving without warning. Check engine light illuminates. Vehicle fails to restart or restarts sporadically. Mechanics diagnose timing issues, bad engine computers, or recommend full engine replacement.
When: 45,000–112,000 miles; one instance at 175,000 miles
Symptoms owners cite: Engine stalls without warning while driving (45–73 mph); Check engine light illuminates; Vehicle fails to restart after stall; Loss of motive power; Sluggish driving before stall in some cases
Codes mentioned: Check Engine Light
Repairs/costs cited: Mechanics diagnosed bad engine computer, piston rod/crankshaft damage, or recommended full engine replacement. One owner's husband replaced starter; engine replacement not performed. Repairs not completed in most cases.
Recalls/TSBs owners mention: Manufacturer notified in at least two cases; no recalls or warranty action reported.
Water pump repeat failure
Water pump requires replacement multiple times on the same vehicle within a short service history, suggesting defective component or poor durability.
When: 36,500 miles total on vehicle; four replacements over service period
Symptoms owners cite: Coolant leaks (radiator fittings detach; coolant loss observed)
Repairs/costs cited: Water pump replaced on four separate occasions on same vehicle. One owner reported radiator fitting detached, causing coolant leak and loss of power during acceleration.
Synthesized from 23 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 0 most recent
Had engine trouble with your 2006 Cadillac CTS?
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 engine problem on the 2006 Cadillac CTS?
It's a documented issue but not catastrophic. 23 complaints have been filed. Repairs average $3,100 and most owners catch it before it causes a breakdown.
At what mileage does the engine typically fail?
Across the 20 complaints that reported odometer mileage, most engine failures cluster between 38,000 and 112,000 miles, with the median around 75,000. A quarter of owners report trouble before 38,000; a quarter make it past 112,000. 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 $3,100 for engine 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 engine?
No active recalls currently cover engine 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/2006/Cadillac/CTS.
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.