2003 Cadillac CTS Problems

What owners report

Owners of the 2003 Cadillac CTS most often describe the engine shutting off while driving, often with a warning message and sometimes with the key or ignition switch involved, and a separate cluster of complaints about brakes that feel weak or fail, frequently tied to corroded brake lines and hoses. Airbag and seatbelt warnings, exterior lamp trim that comes loose, and coolant or PCV-related leaks also recur. Reports span a wide mileage range, from low-mile cars to well past 100,000 miles, and many note that dealers could not reproduce or permanently resolve the problem.

1. 1
   Engine

   Engine stalls or shuts off while driving

   • 58 complaints (19%)
   • median 74,000 mi at 11.0 yrs old (47 state mileage)
   • 6 mention a crash, fire or injury
   • filed 2002–2022

   Owners describe the vehicle shutting off without warning at highway and city speeds, sometimes with a warning message about the key or with the security light on. Some say the engine restarted normally after coasting or pulling over, while others report repeated stalls that dealers could not diagnose or repair. Several complaints tie the stall to the ignition switch or key position, and some describe losing power steering and brake assist at the same time. Reported from very low mileage up to roughly 130,000 miles, with most complaints between about 70,000 and 110,000 miles.

   Recall 14V394000

   What to check: Ask whether the ignition recall (14V394000) was performed and whether the key turns freely; test drive at highway speed and note any stalling, key or security warnings, or loss of steering and brake assist.

   2 excerpts from owner complaints in NHTSA records

   “While driving turning left onto an expressway entrance my engine shut down I believe it was the ignition switch. I've taken the vehicle to the dealer numerous times and they can't seem to find a solution. I am in fear that one day this car will lose power at the wrong time and cause a serious if not fatal accident. I would like the problem fixed or a reimbursement to invest in a new vehicle before it is too late.”

   NHTSA complaint #10616213, filed 2014-07, 105,000 miles

   “While entering the highway at about 50mph I noticed well into a left veering merge, that my vehicle engine had shut off. All the accessories were still running as far as radio and air conditioner while the battery light flashed on the dash. My steering wheel locked in a cocked position as well as losing the ability to stop the vehicle with the brakes. I was forced to slam the emergency brake to the floor to get my vehicle to stop before being crunched from oncoming highway traffic at 60 to 80+ MPH. …”

   NHTSA complaint #10631177, filed 2014-09, 92,509 miles
2. 2
   Brakes

   Corroded brake lines and hoses, weak or failing brakes

   • 45 complaints (14%)
   • median 85,000 mi at 8.6 yrs old (36 state mileage)
   • 3 mention a crash, fire or injury
   • owner-quoted repair $800 (median of 5 quotes)
   • filed 2002–2020

   Complaints describe the brake pedal going soft or to the floor, longer stopping distances, and brake lines or hoses found badly corroded at their supports, sometimes in rust-belt states. Some owners report a hose or line failing while driving, with ABS and traction lights coming on, and dealers replacing corroded lines and calipers. Others mention vibration or pulling when braking and repeated trips to get parts that were not in stock. Mostly reported between about 50,000 and 120,000 miles, often on vehicles that spent time in cold, salted-road states.

   Recall 10V105000

   What to check: Have a shop inspect the steel brake lines and hoses at their clamps for rust, and ask whether recall 10V105000 was completed for this vehicle; a firm pedal and a clean fluid level are good signs.

   2 excerpts from owner complaints in NHTSA records

   “There is a open recall effecting this year & make although my VIN says there's no recalls on my CTS. I had both front brake hose assemblies fail while driving. Luckily we didn't wreck. I've since had both repaired. Curious as to know why car was not listed with open recall.”

   NHTSA complaint #11339640, filed 2020-07, 83,000 miles

   “I drive a 2003 Cadillac CTS. I noticed the brakes seemed to need repair (not responsive enough) and the brake light came on. My car had approx 70000 miles and the brake lines had corroded! I have the brake lines that were removed. A car with 70k miles should not have corroded brakelines. In addition, it took almost 2 weeks to get replacement parts and cost $250 to repair + rental car. This was a really bad accident waiting to happen.”

   NHTSA complaint #10300070, filed 2010-01, 74,000 miles
3. 3
   Air bags

   Airbag light on, airbag module or sensor concerns

   • 37 complaints (12%)
   • median 107,000 mi at 11.5 yrs old (29 state mileage)
   • 17 mention a crash, fire or injury
   • filed 2003–2020

   Owners report the airbag warning light staying on or coming on intermittently, with some dealers unable to duplicate the fault and others replacing the airbag module or a seat sensor. A few complaints describe airbags that did not deploy or deployed only partially in a collision, and some owners say parts for the seat airbag sensor are no longer available. Reported across a wide range, from about 28,000 miles to over 130,000 miles.

   Recall 14V394000

   What to check: Check that the airbag light goes out after the bulb-check sequence at start-up, and ask whether the ignition recall related to the airbag system was performed.

   2 excerpts from owner complaints in NHTSA records

   “Bought car for teenage daughter and the air bag light came on. Found out 2005-2007 had a recall for this issue. Cadillac refuses to acknowledge that this is a safety issue and should take responsibility for repairs. I am concerned that until parts come in my new driver is unprotected if in an accident.”

   NHTSA complaint #10504224, filed 2013-03, 107,000 miles

   “While driving on the freeway consumer heard a noise under the vehicle. Consumer tried to control the vehicle and it began to swerve. While trying to keep it under control, vehicle flipped over, and the air bags failed to deploy. Vehicle was totaled. The consumer believes the steering shaft bolt became loose and caused the accident.”

   NHTSA complaint #10067054, filed 2004-07, 16,000 miles
4. 4
   Engine cooling

   Coolant leaks from water pump and PCV-related oil leaks

   • 44 complaints (14%)
   • median 71,000 mi at 8.0 yrs old (35 state mileage)
   • 9 mention a crash, fire or injury
   • filed 2002–2023

   Owners describe coolant leaks traced to the water pump, sometimes with a cracked or broken pulley, and repeat service visits for leaks. Others report oil leaking from a frozen or blocked PCV passage and valve cover gasket, with smoke or burning oil smell reaching the cabin, and dealers resealing or replacing gaskets and related parts. Mostly reported between about 49,000 and 75,000 miles, often in cold weather.

   3 related service bulletins

   What to check: Look for coolant residue or crust around the water pump and hoses, check the oil for a fuel or burned smell, and ask whether the PCV passage or valve cover gaskets have been serviced.

   2 excerpts from owner complaints in NHTSA records

   “V6 engine with coolant leaks. 3rd time something dealing with a leak reason for service. This time a water pump that lead to broken,crack pulley. I can find no one ever having this problem. I have been without a car almost 30 days.”

   NHTSA complaint #10247370, filed 2008-10, 49,000 miles

   “I bought this car for my son that go to college at san jose state university, his been using this car since 2015 till 2019. Recenty about a month ago his complaining the car has been overheating for no reasons, he says that the gauge goes all the way up everytime he drive it but its ok if the car engine is running but in park mode. We ended up got the car towed to merced. Since july of 2019, the car is the garage and never drive. We only start the car mostly to warp up the engine but not drive. …”

   NHTSA complaint #11244966, filed 2019-08, 25 miles
5. 5
   Exterior lighting

   Rear lamp and backup light trim coming loose

   • 18 complaints (6%)
   • median 87,000 mi at 7.8 yrs old (14 state mileage)
   • filed 2009–2014

   Complaints describe the rear backup light panel or trim cover coming off, sometimes in a car wash, and the center rear brake light failing. Owners say the plastic mounting or adhesive lets go over time and that replacement parts are costly, and some dealers told them the part had been redesigned or was not covered. Reported mostly between about 55,000 and 100,000 miles.

   2 related service bulletins

   What to check: Inspect the rear backup and center brake lamp housings for looseness, missing trim, water inside the lens, or dark segments, and check that all rear lamps work.

   2 excerpts from owner complaints in NHTSA records

   “The exterior back brake lights fell off my Cadillac CTS 2003 model. I have noticed a majority of the 2003 CTS models have the same problem. It's a shame Cadillac would not be responsible, the vehicle cost me over 30,000.00 after its paid for, they have no concern for the condition of my vehicle. It really makes Cadillac look awful to have that many vehicles in the same condition. I will not purchase any more cadillacs.”

   NHTSA complaint #10343500, filed 2010-07, 92,000 miles

   “The rear back up light panel has a plastic cover over it. Mine fell off and I am having a terrible time replacing it. I contacted Cadillac, but they don't sell that piece anymore. They have redesigned a replacement that will not fall off but it costs over $500 and Cadillac won't cover it because they claim it has not been recalled. As I drive up and down the streets and highways in chicago, I notice many 2003-2007 Cadillac CTS are also missing this part. How can this plastic part fall off with out cause and yet not be recalled?”

   NHTSA complaint #10413446, filed 2011-07, 55,000 miles

Buying note. On a 2003 CTS, prioritize a brake-line inspection and confirmation that the brake and ignition recalls were completed, then check for stalling on a highway test drive and for airbag or warning lights. Service records showing coolant, PCV and gasket work help, since these are the areas owners most often describe.

Summary written with AI from a sample of 60 NHTSA complaints for this model year (picked at random, with complaints that state a mileage and recent ones taken first), then checked automatically against the source records. Where a problem shows a complaint count, every complaint for this model year was matched with fixed keyword rules (written with AI and tested against the sample), and the mileage, age and repair figures are calculated from those complaints; owners' figures are as stated, not verified. Other counts refer to the sample. The excerpts come from NHTSA's public complaint records and are unverified; capitalisation is normalised, NHTSA staff notes are removed, and shortened text ends with “…”. Something wrong? Request a correction.