2003-2019 Cadillac CTS Problems: 14 Known Issues

On certain 2013-2014 Cadillac CTS vehicles, internal contamination in the chassis electronic module can cause an electrical short and stall the engine.

On certain 2003-2014 Cadillac CTS vehicles, key-ring weight, road conditions or another jarring event can move the ignition switch out of Run, turn off the engine and prevent airbag deployment in a crash.

The 2008 and 2009 Cadillac CTS is included in NHTSA recall 10V240000 when it was built with the heated washer fluid system (HWFS). GM ran a 2008 recall that added a fuse to the control circuit harness to limit what a short in the module's printed circuit board could do, but reports of thermal incidents continued on modules that had already been through that repair; NHTSA attributes these to a new failure mode in the device's thermal protection feature. NHTSA states that the heated washer module may ignite and a fire may occur.

The front doors of the 2008-2014 CTS do not use a mechanical cable to the latch. Pulling the outside handle closes an electronic micro-switch in the handle base, which commands the latch actuator to release. When the micro-switch or its connector corrodes or wears out, the doors will still unlock with the fob but the door will not open from outside - owners report having to reach in from the other door or through a window. Failures often cascade: multiple owners on Cadillac Owners Forum report a second and third handle failing within weeks of the first. The failure is usually diagnosed incorrectly as a bad lock actuator, which is a much more expensive part.

The 3.6L LLT direct-injection V6 used in the 2008-2011 CTS (and the 2007 gen-1 3.6L LY7) is among the best-documented GM V6 failures: the primary and secondary timing chains elongate well before 100,000 miles, throwing off intake/exhaust cam correlation. Chain wear is strongly accelerated by extended oil-change intervals and low oil level, which starve the hydraulic chain tensioners. GM acknowledged the defect with Special Coverage bulletin 11340 (revisions A/B/C) extending timing-chain coverage to 10 years / 120,000 miles on affected models including the 2007-2009 CTS, and with service bulletin 12-06-01-009F describing the updated chain/tensioner/guide kit. This is an LLT/LY7-era issue (the LLT is direct-injected; the LY7 is port-injected) and should not be attributed to the later LFX or to the 2.0L LTG four.

On some 2008-2011 CTS models the throttle-position sensor can cause the engine to run rough, illuminate the check engine light and/or an engine reduced power message, and reduce engine power. GM recognized the condition with Special Coverage Adjustment 14582, which covered it for 10 years / 120,000 miles from the original in-service date, whichever came first, regardless of ownership.

The 3.6L V6 pulls crankcase vapor through a fixed-orifice PCV passage integrated into the valve cover rather than a serviceable PCV valve. The orifice sludges up and the baffle behind it does a poor job of separating oil from the vapor stream, so liquid oil is drawn into the intake and burned. Owners across the first- and second-generation 3.6L cars report consumption in the range of a quart every 1,500-2,500 miles with no external leak and no smoke visible from the driver's seat. GM addressed it partially with a redesigned driver's-side valve cover carrying an improved baffle, and later revised the PCV orifice size on the LLT around the 2013-2014 timeframe. Because there is no drip, this gets missed until the low-oil light comes on - and on this engine, low oil is exactly what kills the timing chain tensioners.

The 2.0L LTG turbocharged four in the third-generation CTS is direct-injected, so no fuel ever washes across the back of the intake valves. Oil vapor drawn in through the PCV system bakes onto the valve stems and seats and builds a hard carbon crust that chokes airflow. The result appears gradually as a rough or lumpy cold idle, a stumble under light throttle, misfire codes and a measurable loss of power and fuel economy - typically becoming noticeable somewhere past 60,000-80,000 miles, sooner on cars driven in short trips. Owners on Cadillac Owners Forum also report oil pooling in the intake plenum at the PCV connection, which accelerates the deposit rate. This is a direct-injection design characteristic, not a defect covered by any recall, and it is specific to the DI engines - it should not be conflated with the V6 timing chain story.

On certain 2016-2018 Cadillac CTS vehicles, electric power-steering assist may fail and require greater steering effort, especially at low speeds.

On certain 2015 Cadillac CTS vehicles, the bracket between the brake-pedal assembly and the brake-actuating rod may fracture during normal pedal operation, preventing the driver from applying the brakes.

On certain 2005-2007 Cadillac CTS vehicles, a rear-axle pinion seal may leak fluid. Continued fluid loss can lead to rear-differential failure, loss of motive power or loss of control.

The engine-driven water pump on the 3.6L V6 (LY7, LLT and LFX) develops a weep at the shaft seal. What makes this failure hard to catch is that many CTS pumps leak only when the system is hot and fully pressurized; the orange-pink DEX-COOL evaporates off the hot block and leaves little more than a crusty residue, so a cold inspection at the dealer finds nothing. Owners on Cadillac Owners Forum describe chasing a slowly dropping coolant level for months with repeated 'no leak found' visits. Left alone the pump eventually fails outright, and on an aluminum-head V6 that means overheating and possible head gasket or head damage. Note the LLT also has a small auxiliary electric coolant pump, which is a different part and a different failure.

Third-generation CTS models with the 8L45 (2.0T and some 3.6L) or 8L90 eight-speed automatic develop a pronounced shudder or vibration at steady cruising speeds, typically between 25 and 80 mph, when the torque converter clutch is partially applied. GM determined the root cause was the original factory-fill automatic transmission fluid, which is hygroscopic; absorbed moisture changes the fluid's friction characteristics, glazes the TCC friction material and produces a slip-stick judder that owners describe as driving over rumble strips. GM addressed it with service bulletin 18-NA-355, which covers 8L45 and 8L90 transmissions in 2016-2019 CTS among other models. Drivers often mistake it for an engine misfire or an out-of-balance driveshaft.

The Cadillac User Experience (CUE) capacitive touchscreen fitted to CTS models from 2014 onward suffers separation of the bonded layers behind the glass. The screen develops a spiderweb of hairline cracks radiating from the edges, then stops responding to touch or begins registering phantom presses that change radio stations and climate settings on their own. Because CUE controls climate, audio and phone with no redundant hard buttons, a failed screen disables a large part of the car's controls. GM issued its first dealer bulletin on delamination in December 2014 and multiple preliminary information bulletins followed (PIC6055 and revisions). GM never issued a recall or a reimbursement campaign, and a class-action lawsuit over the defective screens was filed in 2019.