While driving I heard a loud noise from under the hood and the service engine soon light came on. Once able to stop I called onstar and asked them to give me a diagnostic. I was told that it was an engine error and to take in for service. I took the car to the dealer first thing the next morning. Was told my timing chain needed to be replaced. My car has less than 28,000 miles. Called…
2009 Cadillac CTS powertrain problems
moderate 28 complaints filed with NHTSA · avg repair $2,500 · see powertrain across all vehicles →
Failure mileage
Complaints
28
Recalls
0
Avg fix
$2,500
1crash
When does it fail?
Of the 28 powertrain complaints filed for the 2009 Cadillac CTS, here's the actual mileage breakdown — failures cluster heaviest at 25,000-50,000 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
Owners have filed 28 powertrain complaints with NHTSA against this vehicle, but no formal recall covers the issue — the federal record reflects what manufacturers have admitted, not everything owners are reporting.
No new NHTSA powertrain complaint has been filed on this vehicle in over 11 years — the issue may be aging out of the active population.
The failure pattern owners describe
Buyer takeaway: A used 2009 Cadillac CTS powertrain carries serious risk: owners report recurring rear-differential grinding that dealers dismiss as normal, sudden transmission failures under 110,000 miles with zero warning, premature timing-chain wear that GM only covers on some VINs, and persistent shuddering/vibration from the factory that service bulletins cannot fix. Expect expensive repairs if the transmission, differential, or timing chain fail outside of warranty.
The 2009 CTS powertrain shows a clear pattern of mechanical failure across multiple systems. Rear differential problems start early—owners report loud grinding and clunking during slow turns in cold weather, recurring after dealer fluid flushes, with one customer in the shop for the same complaint three times in five years. Multiple owners report complete transmission failure under 100,000 miles with no warning lights or diagnostic alerts, leaving them stranded and facing $4,000+ repair bills. Timing chains fail prematurely; GM issued a service bulletin (TSB 11340, NHTSA reference 10043857) for 2007–2009 CTS models covering failures within 10 years or 120,000 miles at no charge, but owners report VINs are inexplicably excluded from coverage. Transfer case assemblies seize at low speeds without warning. Highway shuddering and vibration present from delivery on some cars; GM's service bulletin fix (rubber insulators and TCM reprogram) only shifts the problem to higher speeds, and dealers claim it is inherent design. One owner reports rear differential catastrophic failure at 20,000 miles with wheel lockup and 150-foot skid. Unintended acceleration, traction control faults, and stuck ignition keys round out the complaints. The core issue: powertrain failures occur suddenly, often without warning indicators, and happen well before typical transmission lifespan expectations.
Same Cadillac CTS powertrain reports on nearby years: 2006 · 2007 · 2008 · 2011
Failure modes owners describe
Rear differential grinding/clunking on slow turns
Rear differential makes loud grinding and clunking noises during slow, sharp turns at parking lot speeds, especially when the vehicle is cold and just starting operation. Noise disappears after warm-up. Dealer has repeatedly tried servicing with fluid changes (documents #3402587, #4013532) but the issue recurs within thousands of miles. Owner reports three separate service visits for the same complaint over approximately five years.
When: Starts around 36,605 miles; recurs at 64,269 miles and 71,678 miles. Occurs when vehicle is cold.
Symptoms owners cite: Loud grinding noise from rear during slow, tight turns; Clunking sounds at parking lot speeds; Noise present at 25–30 mph during turns; Noise disappears after vehicle warms up
Repairs/costs cited: Multiple fluid flushes and replacements with 'updated' and additive-enhanced gear oil per TSB documents #3402587 and #4013532. Temporary relief only; noise returns.
Recalls/TSBs owners mention: Dealer claims grinding is normal and expected behavior. GM references service bulletins (#3402587, #4013532) for rear differential servicing; owner disputes that this is an acceptable fix.
Complete transmission failure with no warning
Transmission fails suddenly without warning lights or diagnostic indicators. Owner reports thumping during gear shifts for 3 days before complete failure. Vehicle becomes immobilized in parking lot at under 90,000 miles. Dealer initially claims no transmission problems were detected on prior service visit at 98,000 miles; no check-engine light illuminated. Owner had OnStar throughout vehicle life but received no diagnostic warnings. Repair cost exceeded $4,000. Similar failure reported at 101,000 miles after thumping between reverse and drive shifts.
When: Under 90,000 miles (one case), 101,000 miles (another case). Failure occurs suddenly after 3–4 days of thumping noises.
Symptoms owners cite: Thumping noise when shifting between gears; Thumping when transitioning from reverse to drive or coming to a stop; Grinding noise immediately prior to loss of all forward and reverse motion; Vehicle immobilized, unable to move forward or backward; No check-engine light prior to failure
Repairs/costs cited: Complete transmission replacement required; cost $4,000+. Dealer service records show no warning of impending transmission failure at prior maintenance visits.
Recalls/TSBs owners mention: Dealer claims no recall exists and states no other customers have reported this issue. OnStar diagnostic system failed to alert owner to transmission condition.
Timing chain premature wear and failure
Timing chain fails prematurely, triggering service engine light and engine codes. Owner reports codes P0008 and P0017 at less than 28,000 miles. Cadillac Las Vegas service manager confirmed a service bulletin exists (TSB 11340, NHTSA reference 10043857) for 2007–2009 CTS equipped with 2.8L/3.6L V6 engines covering premature wear within 10 years or 120,000 miles, but owner's VIN was excluded from coverage despite meeting criteria. Multiple owners report GM refusal to honor the bulletin.
When: Less than 28,000 miles (one case). Another case references timing chain being 'out' but mileage unspecified. Service bulletin covers failures within 10 years or 120,000 miles.
Symptoms owners cite: Service engine soon light illumination; Loud noise from under hood; Engine codes P0008 (Exhaust Camshaft Position Timing Over-Advanced) and P0017 (Crankshaft/Camshaft Timing Misalignment)
Codes mentioned: P0008, P0017
Repairs/costs cited: Timing chain replacement required. Cost not specified in narratives.
Recalls/TSBs owners mention: TSB 11340 (NHTSA reference 10043857) covers premature timing chain wear on 2007–2009 CTS with V6 engines within 10 years or 120,000 miles at no charge. However, owners report VINs are selectively excluded from coverage without clear explanation, and GM refuses to acknowledge culpability despite vehicles meeting bulletin parameters.
Transmission shudder, vibration, and drone at highway speeds
Vehicle generates drone, boom, and vibration during acceleration and highway driving. Vibration is severe enough to make steering wheel shake and cause safety concerns about mechanical component failure. Problem present from new vehicle delivery. GM issued service bulletin #08-07-30-044B to install rubber insulators and reprogram transmission control module, but this temporary fix merely shifts the vibration to higher RPM/speed ranges. Dealer claims noises are inherent to vehicle design with no fix available.
When: Present from new vehicle delivery; persists throughout ownership. Worst between 64–75 mph.
Symptoms owners cite: Drone noise constant during highway acceleration; Boom vibration when accelerating to or driving at highway speeds; Boom noise at 5 mph when coming to a stop; Steering wheel shakes during vibration event; Vibration shifts to higher RPM after TSB service attempt
Repairs/costs cited: Service bulletin #08-07-30-044B applied: rubber insulators installed and transmission control module reprogrammed. Repair unsuccessful; vibration persists at higher speeds.
Recalls/TSBs owners mention: GM issued TSB #08-07-30-044B for rubber insulators and TCM reprogram. Dealer service manager claims noises are inherent design with no fix; Cadillac states vibration/drone cannot be corrected.
Rear differential catastrophic failure with wheel lock
Rear differential fails suddenly at highway speed, causing rear wheels to lock and vehicle to skid 150 feet. Owner heard loud boom from rear; rear wheels locked at 40 mph, causing severe jerking and skidding. Same failure repeated at 5 mph. GM authorized immediate replacement of entire rear differential assembly under warranty without diagnosis. Service manager noted no fluid leakage and differential was full of fluid when removed, indicating sudden mechanical failure rather than fluid degradation.
When: At 20,000 miles on 12/12/09.
Symptoms owners cite: Loud boom from rear of vehicle; Rear wheels suddenly lock; Severe jerking and skipping motion; 150-foot skid with wheel lockup at 40 mph; Failure recurs immediately at 5 mph
Repairs/costs cited: Entire rear differential assembly replaced under warranty without prior removal for diagnosis.
Recalls/TSBs owners mention: GM authorized dealer to replace rear differential assembly under warranty sight unseen. No investigation of root cause performed.
Transmission spline strip and loss of drive
Transmission spline strips out due to rust and possible poor workmanship. Vehicle immobilized during operation. Failure occurred just after warranty expiration, leaving owner with $4,000 repair bill. Owner views this as potential safety hazard, noting failure on interstate highway could have caused serious accident.
When: Just after warranty expiration; exact mileage not specified but described as post-warranty failure.
Symptoms owners cite: Loss of drive motion; Vehicle immobilized
Repairs/costs cited: Transmission spline replacement approximately $4,000.
Recalls/TSBs owners mention: None documented. Vehicle was outside warranty coverage.
Transmission lockup at low speed without warning
Transmission locks up suddenly while vehicle is stationary or moving at low speed. Vehicle becomes immobilized and will not shift into gear. Whining noise heard during lockup event. Occurs without prior warning lights or diagnostic alerts.
When: At 59,000 miles (one case); 77,000 miles (another case); at low speeds or traffic stops.
Symptoms owners cite: Transmission locks up suddenly; Vehicle will not move; Whining noise during lockup; No warning signs or check-engine light
Repairs/costs cited: Cost not specified in narratives; repair type not fully documented.
Transfer case and transmission component failure
While driving at low speed (5 mph in intersection), vehicle stalls without warning and cannot be restarted. Dealer diagnosis reveals multiple transmission and transfer case component failures: main shaft, transfer case fluid contamination, output shaft, gasket, transmission fluid (DEX6), and transfer case assembly. Complete transfer case removal and replacement required. Manufacturer opened a case following dealer notification.
When: At approximately 110,000 miles.
Symptoms owners cite: Vehicle stalls without warning at low speed; Unable to restart vehicle; Total loss of drive motion
Repairs/costs cited: Main shaft, transfer case fluid, output shaft, gasket, transmission fluid (DEX6), and transfer case assembly replaced. Transfer case assembly removed and replaced.
Recalls/TSBs owners mention: Manufacturer made aware of failure and opened a case.
Unintended acceleration and drive shaft fastener failure
Vehicle accelerates on its own while driving at 40 mph without driver input. Dealer technician tightened drive shaft bolts to transmission, but unintended acceleration recurred after repair, indicating fastener failure is symptomatic of underlying drivetrain issue.
When: At approximately 59,000 miles.
Symptoms owners cite: Vehicle accelerates on its own at 40 mph; Loss of driver throttle control
Repairs/costs cited: Drive shaft bolts to transmission tightened; fastener re-loosened, indicating structural or component wear issue.
Recalls/TSBs owners mention: Manufacturer not made aware of failure per complaint.
All-wheel-drive system failure causing loss of traction stability
All-wheel-drive system fails, causing StabiliTrac and ABS to disengage. Vehicle operates in rear-wheel-drive only, which is unstable due to minimal weight over rear wheels. Particularly dangerous in wet or snowy conditions; vehicle slides excessively. Problem recurs (second occurrence reported).
When: Mileage and timing not specified. Occurred at least twice.
Symptoms owners cite: StabiliTrac system goes out; ABS system goes out; Vehicle operates in rear-wheel-drive only; Excessive sliding in snow or rain; Difficulty controlling vehicle in wet/slippery conditions
Repairs/costs cited: Repair details not provided in narrative.
Transmission output shaft shearing
Vehicle fails to accelerate as needed when pedal is depressed at traffic light. Abnormal sound generated. Mechanic identifies issue per Technical Service Bulletin 10-07-30-005a (Transmission output shaft and transfer case input shearing). Suggests output shaft shearing or transfer case input failure.
When: Mileage unknown.
Symptoms owners cite: Vehicle fails to accelerate when pedal depressed; Abnormal sound generated; Loss of or delayed power delivery
Repairs/costs cited: Technical Service Bulletin 10-07-30-005a references transmission output shaft and transfer case input shearing.
Ignition key stuck; unable to shut off engine
Key becomes stuck in ignition and will not turn to shut off vehicle. Occurs in evening with no dealership or OnStar assistance available. Vehicle left running and unattended overnight, creating risk of engine fire, fuel leakage, and unattended vehicle movement if shifter is engaged or moved by child.
When: After 9 PM in evening; exact mileage unknown.
Symptoms owners cite: Key stuck in ignition; Unable to turn key off; Unable to shut down engine
Repairs/costs cited: No repair information provided.
Unexpected vehicle rollback and collision
Vehicle rolls backward out of driveway without driver input and crashes into fire hydrant and tree, damaging both doors. Vehicle subsequently declared a total loss. Owner notes vehicle was subject to NHTSA campaign 14V394000 (electrical system issue). Dispute arose between dealer lawsuit for remaining balance and insurance company refusal to pay, citing manufacturer defect as cause.
When: Mileage unknown.
Symptoms owners cite: Unexpected backward rollback from parked position; Loss of brake or transmission hold
Repairs/costs cited: Vehicle totaled; not repaired.
Recalls/TSBs owners mention: Vehicle was included in NHTSA campaign 14V394000 (electrical system). Insurance company cited manufacturer defect as cause of failure.
Service traction control malfunction and transmission gear shift failure
Service traction control light illuminates while driving. After pulling over and turning off, vehicle will not shift into gear. Loud roaring sound occurs during driving.
When: Mileage and timing not specified.
Symptoms owners cite: Service traction control light activation; Vehicle will not shift into gear after restart; Loud roaring sound while driving
Repairs/costs cited: No repair documented.
Rear jolting/stabbing brake sensation at variable speeds
Vehicle exhibits jolting or pulsing in rear that mimics stabbing braking action. Occurs at all speeds but intermittently, not consistently. Suggests possible rear brake, differential, or suspension issue.
When: Mileage and timing not specified.
Symptoms owners cite: Jolting sensation in rear of vehicle; Stabbing brake-like pulsing motion; Intermittent occurrence at all speeds
Shuddering between 40–75 mph from new vehicle
Vehicle with 3.6L direct-inject engine shudders between 40–75 mph starting at 700 miles. GM acknowledges design flaw but states no fix currently available for this engineering issue.
When: Starting at 700 miles; design flaw, not wear-related.
Symptoms owners cite: Shuddering motion between 40–75 mph; Present from very low mileage (700 miles)
Repairs/costs cited: No fix available per GM.
Recalls/TSBs owners mention: GM aware of design flaw; states no fix currently available for this engineering issue.
Loss of forward motion during highway driving
During highway driving, vehicle loses all forward motion capability and coasts to a stop. No forward or rearward movement possible afterward. Suggests complete transmission or drivetrain failure.
When: During highway driving; mileage unknown.
Symptoms owners cite: Sudden loss of forward motion while driving; Coasting to stop without engine shutdown; No forward or reverse capability after stopping
Repairs/costs cited: Repair type not specified.
Synthesized from 28 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 2 most recent
Timing chain check engine light
Had powertrain trouble with your 2009 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 powertrain problem on the 2009 Cadillac CTS?
It's a documented issue but not catastrophic. 28 complaints have been filed. Repairs average $2,500 and most owners catch it before it causes a breakdown.
At what mileage does the powertrain typically fail?
Across the 19 complaints that reported odometer mileage, most powertrain failures cluster between 36,605 and 106,000 miles, with the median around 82,000. A quarter of owners report trouble before 36,605; a quarter make it past 106,000. 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 $2,500 for powertrain 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 powertrain?
No active recalls currently cover powertrain 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/2009/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.