This service bulletin provides information for dealers/technicians on OnStar Module 2G Sunset Information.
full bulletin at NHTSA ↗2009 Cadillac CTS electrical problems
moderate 22 complaints filed with NHTSA · avg repair $850 · see electrical across all vehicles →
Failure mileage
Complaints
22
Recalls
0
Avg fix
$850
When does it fail?
Of the 22 electrical 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
No new NHTSA electrical complaint has been filed on this vehicle in over 6 years — the issue may be aging out of the active population.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering electrical 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 Preliminary Information communicates to the dealer the process for downloading or updating operating software for the Tire Pressure Monitor, Active Fuel Injector tester, multi media tester, PICO Scope, GR8 starting/charging tester and Vehicle Data Recorder tools, giving website address and step by step instructions to complete the update.
full bulletin at NHTSA ↗This Preliminary Information communication provides information to the technician about vehicles that have an intermittent no crank, no start, or start stall concern with the security light coming on. Technician may find Diagnostic Trouble Codes B3055, B3060, and/or B3935. Technician should not replace any parts for this concern. If unable to duplicate the concern ask if the customer uses any Radio Frequency Identification Devices when the concern is present. Dealer should also direct their customers to the appropriate section in the Owner manuals that references that the device complies.
full bulletin at NHTSA ↗Vehicle Wide Programming (VWP) is a new process to update software on GM Vehicles. It provides the ability via a single selection within Techline Connect to first identify which modules need updating and then proceed to updating affected modules (with some exceptions). The updating of modules is completed in parallel instead of the technician needing to update one module at a time. This allows a more streamlined approach for dealers and customers.
full bulletin at NHTSA ↗This Preliminary information communicates to the dealer an issue where the vehicle's engine may crank over unprompted and not start afterward. This is the result of hooking up the Active Fuel Injector Tool incorrectly on vehicles equipped with a direct fuel injection system. This Preliminary information instructs the dealer of a repair kit they received that will prevent this issue when installed correctly.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Owners report scattered but serious electrical issues across this generation CTS. Ignition coil failures appear twice in the same vehicle, with the first failure around 68k miles causing vibration, rough shifting, and power loss before a trouble code appears; the second failure hits the opposite bank months later with identical symptoms and again no initial warning light.
Battery drain is a recurring nightmare—cars go stone dead after 7-10 days of parking, stranding owners who can't unlock or start the vehicle. A dealership response was to install a trickle charger and advise weekly driving, which is a band-aid, not a fix.
Engine stalling while driving is documented, sometimes paired with reduced power limp mode that cut RPMs to 2500 in heavy traffic and rain. Door locks fail inconsistently—rear doors won't lock or unlock via fob or switch, passenger doors trap occupants or bounce open, and automatic locking stops working. A few owners report water intrusion from the sunroof damaging the motherboard and causing cascading electrical failures.
Turn signal circuits fail silently without warning lights. Ignition key gets stuck in ON position, preventing shutdown. A service airbag light stays on tied to a passenger presence module. One vehicle unexpectedly loses all dashboard backlighting while moving. These are unverified consumer complaints, but the pattern suggests systemic electrical control issues beyond a single component.
Same Cadillac CTS electrical reports on nearby years: 2006 · 2007 · 2008 · 2011
Failure modes owners describe
Ignition coils failure
One or both sides of engine ignition coils fail, causing rough running and power loss. Can recur on the other side months or years later.
When: First occurrence before July 2013; second occurrence July-August 2013
Symptoms owners cite: erratic gear shifting; engine vibration; lack of power; transmission downshift; no trouble light initially
Repairs/costs cited: Dealer replaced all ignition coils on affected side
Battery discharge during storage
Vehicle battery drains completely when parked for 2-3 weeks or 7-10 days, leaving the car unable to start or unlock. Dealership root cause remains unexplained in multiple service visits.
When: After 2-3 weeks of parking; fourth service visit extended over 3 weeks with no resolution
Symptoms owners cite: unable to start vehicle; unable to unlock doors; completely dead battery after storage
Repairs/costs cited: Dealership installed trickle charger as temporary workaround; owner advised to drive at least weekly
Reduced engine power limp mode
Check engine light and 'reduced engine power' message appear while driving, limiting engine to approximately 2500 RPM. Incident occurred during heavy rain and traffic.
When: During interstate driving in rainstorm
Symptoms owners cite: check engine light; reduced engine power message; RPM limited to ~2500; loss of acceleration
Driver-side turn signal failure
Turn signal on driver side fails without warning indicators. Computer chip replacement and reprogramming was recommended but not performed.
When: At 35,000 miles
Symptoms owners cite: turn signal inoperative; no warning light
Repairs/costs cited: Independent mechanic stated computer chip needed replacement and reprogramming
Recalls/TSBs owners mention: Manufacturer notified
Ignition key stuck in ON position
Key fails to shift out of ON position while vehicle is in Park, preventing engine shutdown. Related to ignition lock assembly defect.
When: At 68,300 miles
Symptoms owners cite: key unable to turn off; key stuck in ON position
Repairs/costs cited: Dealer replaced ignition lock assembly and two keys
Recalls/TSBs owners mention: NHTSA CAMPAIGN NUMBER: 14V394000 (ELECTRICAL SYSTEM)
Power door lock failure
Rear doors fail to lock or unlock via switch or FOB, requiring manual unlock from inside vehicle. Both rear locks failed. Front doors work normally. Automatic locking also fails.
When: At 119,000 miles for one case; no specific mileage stated for others
Symptoms owners cite: rear doors won't lock or unlock with switch; rear doors won't lock or unlock with FOB; no automatic door locking; passenger door bounces back or traps occupant
Repairs/costs cited: Dealer diagnosed door mechanism replacement needed; one vehicle not repaired
Engine stall during operation
Engine shuts off unexpectedly while driving at any speed or when key is in ON position. Vehicle may restart automatically or require manual restart. StabiliTrac light illuminates, cruise control disables, and doors lock during event.
When: At 13,888 miles; also occurs sporadically
Symptoms owners cite: engine shuts off without warning; StabiliTrac light comes on; cruise control disabled for ~10 minutes; doors lock; vehicle may auto-restart
Repairs/costs cited: Vehicle not taken to dealer or repaired
Start delay and abnormal sound after refueling
Vehicle does not start immediately after refueling; owner must pump accelerator pedal to start. Abnormal sound emanates from rear of vehicle. Owner suspected faulty purge solenoid.
When: At approximately 95,000 miles
Symptoms owners cite: delayed start after refueling; accelerator pedal must be pumped to start; abnormal sound from rear
Repairs/costs cited: Vehicle not diagnosed or repaired by mechanic or dealer
Recalls/TSBs owners mention: Manufacturer suggested filing complaint with NHTSA
Water leak from sunroof into electrical system
Water leaks from sunroof (despite being kept closed) into motherboard area, causing electrical failure. Dealership repair expected to be costly.
When: <UNKNOWN>
Symptoms owners cite: water visible in vehicle; electrical failure from moisture; motherboard damage
Repairs/costs cited: Owner advised to take to dealership for repair; expects high cost
Dashboard light dropout during driving
Dashboard light turns off while vehicle is in motion.
When: <UNKNOWN>
Symptoms owners cite: dashboard light turns off during driving
Water leak unrelated to sunroof
Leaking during rain from unspecified source (not sunroof).
When: <UNKNOWN>
Symptoms owners cite: leaking when raining
Service airbag light for passenger presence module
Service airbag light illuminates due to faulty passenger presence module. Owner reports many others have the same issue and believes the module itself is defective, not just needing replacement.
When: <UNKNOWN>
Symptoms owners cite: service airbag light illuminated
Repairs/costs cited: Diagnosis indicates passenger presence module fault
Synthesized from 22 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 2 most recent
Tl* the contact owns a 2009 Cadillac cts. While making a left turn, the contact noticed that the driver's side turn signal failed to function. There were no warning indicators illuminated. The vehicle was taken to cma's colonial auto center (located at 100 myers dr, charlottesville, va 22901, (434) 951-1000), but was not diagnosed. The vehicle was taken to an independent mechanic who stated that…
2009 Cadillac cts. Attorney writes on behalf of client regarding heated washer fluid system *tgw the consumer received a recall letter stating the heated washer fluid system needed to be removed. The consumer doesn't want the feature removed, because she hasn't experienced any problems. *jb
Had electrical 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 electrical problem on the 2009 Cadillac CTS?
It's a documented issue but not catastrophic. 22 complaints have been filed. Repairs average $850 and most owners catch it before it causes a breakdown.
At what mileage does the electrical typically fail?
Across the 13 complaints that reported odometer mileage, most electrical failures cluster between 35,000 and 90,000 miles, with the median around 68,300. A quarter of owners report trouble before 35,000; a quarter make it past 90,000. 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 $850 for electrical 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 electrical?
No active recalls currently cover electrical 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.