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Brake System Defect - Reduced Brake Assist or Unexpected Braking
brake pedal problem; reduced braking; unexpected braking; brake warning light
Safety2020
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6 recalls including a safety transmission lock-up recall. CT5 owners report door handle failures, ADAS dropouts, and engine defects. See if your CT5 qualifies under California lemon law.
You paid $40,000 or more for a Cadillac CT5. The badge promises German-sport-sedan performance married to American luxury — a car that is equally at home commuting in silence and pressing you into the seat on an on-ramp. Instead, thousands of CT5 owners have discovered a vehicle that sometimes refuses to let them in through the door, lurches violently at highway speed, or goes dark on every driver-assist feature the morning after an OTA update drained the battery.
The CT5 debuted for model year 2020 as the successor to the CTS, and it has accumulated an unusually dense recall record for a car in its second generation. Six formal NHTSA recalls in six model years cover brakes (20V588), two separate airbag defects (21V611, 21V421), exterior lighting (22V903), a safety-critical 10-speed transmission wheel lock-up (25V148), and a documentation non-compliance on the 2026 model (26V114).
Alongside those recalls, GM's own technical service bulletins document a water pump manufacturing defect on the LSY 2.0T engine, an oil-in-coolant casting flaw on the LGY 3.0TT V6 that requires full engine replacement, a pre-recall valve body TSB for the 10L80 transmission that many dealers were mishandling as a simple ABS fault, and an Image Processing Module software bug that disables Super Cruise and all ADAS features at startup.
Owner-reported patterns add a further layer: the CT5's power-presenting door handles — a feature Cadillac markets as premium and futuristic — fail progressively across all four doors of the same vehicle, with replacement costs of $400–$500 per handle and no recall fix on the horizon. For California owners, every one of these failure patterns has a legal dimension. Song-Beverly consumer warranty protections require GM to repair, replace, or refund when a nonconformity cannot be fixed after a reasonable number of attempts.
The issues owners report most, ranked by severity — each one verified against a cited NHTSA source.
brake pedal problem; reduced braking; unexpected braking; brake warning light
airbag warning light; passenger airbag may not deploy; SRS warning; occupant detection fault
airbag warning light; passenger airbag may not deploy; SRS warning; occupant detection fault
tail light out; exterior light warning; reduced rear visibility
transmission shifts unexpectedly; hesitation; harsh shift; transmission warning
warning light; recall notice; repeated dealer repair
A settled Margarian Law case on this exact model, published with the actual settlement math.
Open any defect for the symptoms and why it matters for a California lemon-law claim. Each is tied to a cited NHTSA source.
brake pedal problem; reduced braking; unexpected braking; brake warning light
Recall 20V588 addresses a contaminated sensor connection in the electronic brake boost system that can cause total loss of brake assist, requiring significantly higher pedal force to stop the vehicle. Under Song-Beverly, a safety recall for brake failure on a vehicle still within the warranty period entitles the owner to a repair at no charge; if the dealer cannot complete the recall remedy in a reasonable time — or if the owner experienced a brake-related incident before the recall was performed — those facts support a lemon-law inquiry.
GM will notify owners, and dealers will replace the electronic brake boost module, free of charge. The recall began December 9, 2020. Owners may contact Chevrolet customer service at 1-800-630-2438, Cadillac customer service at 1-800-333-4223, or Buick customer service at 1-800-521-7300. GM's number
airbag warning light; passenger airbag may not deploy; SRS warning; occupant detection fault
Recall 21V421 covers a communications gateway module software defect that causes the airbag malfunction indicator to illuminate or extinguish inconsistently, potentially masking an actual SRS fault. Because occupants rely on the warning lamp to know whether their airbags are functional, this is a safety nonconformity. An owner who returned to the dealer for a recurring airbag light before the recall software fix was available has documented repair attempts directly relevant to a Song-Beverly claim.
The communications gateway module software will be updated by a dealer, or through an over-the-air (OTA) update, free of charge. Owner notification letters were mailed on July 1, 2021. Owners may contact Buick customer service at 1-800-521-7300, Cadillac customer service at 1-800-458-8006, Chevrolet
airbag warning light; passenger airbag may not deploy; SRS warning; occupant detection fault
Recall 21V611 found that the roof-rail curtain airbags on up to 23,093 CT5 units were twisted during installation, potentially preventing correct deployment in a side or rollover crash. A curtain airbag that fails to deploy as designed is a critical safety defect. If a CT5 owner was injured in a crash where this recall had not yet been performed, the unperformed recall is central to both a product-liability and a Song-Beverly analysis.
Dealers will inspect both left and right-side roof rail air bags and reinstall the air bags, as necessary, free of charge. Owner notification letters were mailed on August 30, 2021. Owners may contact Cadillac customer service at 1-800-458-8006. GM's number for this recall is N212342780.
tail light out; exterior light warning; reduced rear visibility
Recall 22V903 addresses a body control module software defect causing daytime running lights to remain illuminated when the headlights are on, creating glare for oncoming drivers. While classified as a Federal Motor Vehicle Safety Standard non-compliance rather than an imminent crash hazard, the failure of the OTA-eligible BCM update to apply correctly on some vehicles means owners may have returned to the dealer repeatedly — qualifying visits that count toward the Song-Beverly repair-attempt threshold if combined with other warranty nonconformities.
The body control module software will be updated by a dealer, or through an over-the-air (OTA) update, free of charge. Owner notification letters were mailed January 23, 2023. Owners may contact GMC customer service at 1-888-988-7267, Chevrolet customer service at 1-800-222-1020, or Cadillac custome
transmission shifts unexpectedly; hesitation; harsh shift; transmission warning
Recall 25V148 (March 2025) confirmed that the 10L80 transmission valve body in 27,097 CT5 units can wear prematurely, causing momentary rear wheel lock-up at highway speeds — a direct loss-of-control safety hazard. Many owners experienced harsh shifts and transmission failures years before the recall was issued in 2025. Under Song-Beverly, dealers who refused transmission repairs citing 'normal operation' or 'driver error' during the pre-recall period may have denied warranty coverage that was legally required. Post-recall part backlogs that left vehicles undriveable for weeks or months further support a repurchase demand.
Dealers will install transmission control module monitoring software, free of charge. Owner notification letters were mailed April 7, 2025. Owners may contact Cadillac customer service at 1-800-333-4223 or Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N242480630.
warning light; recall notice; repeated dealer repair
Recall 26V114 concerns 2026 CT5 vehicles where the radio was not correctly configured during manufacturing to download the electronic owner's manual, preventing owners from accessing safety instructions required by FMVSS No. 208. While this is primarily an administrative non-compliance rather than a mechanical defect, it underscores GM's obligation to deliver a vehicle that fully conforms to federal safety standards at delivery. The remedy — a dealer radio reset — is simple and unlikely to require repeat visits.
Dealers will reset the vehicle radio, which will facilitate automatic download of the electronic owner’s manual, free of charge. Owner notification letters were mailed April 16, 2026. Owners may contact GM customer service at 1-866-467-9700, Chevrolet customer service at 1-800-222-1020 or Cadillac c
Service Driver Assist warning at startup; Super Cruise unavailable; Forward Collision Alert disabled; Lane Keep Assist not working; Take Steering message on instrument cluster; DTCs U1614 U1615 U1616; all driver-assist features grayed out; problem returns after dealer software reset
A vehicle whose forward-collision avoidance, lane-departure warning, and Super Cruise functions are intermittently disabled does not conform to its safety-system warranty. Under Song-Beverly (Cal. Civ. Code §1793.2), if the dealer cannot permanently resolve the IPM reset after two or more repair attempts, the owner may have grounds for a repurchase or replacement claim — particularly because GM's own TSB 20-NA-178 acknowledges the defect.
Reprogram the IPM (K124) with updated GM software per TSB 20-NA-178. If symptom recurs, inspect IPM wiring harness.
loud bang or thud from transmission during coast-down or light acceleration; rear wheels momentarily lock up; ABS or StabiliTrak warning lights; harsh or lurching gear changes at highway speeds; reduced power message; transmission stuck in limp mode; metal debris in transmission fluid; Drive With Care warning; vehicle unable to shift above 3rd or 4th gear
Momentary rear wheel lock-up at highway speed is a direct loss-of-control event. GM acknowledged this in both TSB 21-NA-275 and formal safety recall 25V148 (March 2025). Owners who experienced multiple dealer visits for transmission symptoms before the recall may have accumulated the repair attempts required under Song-Beverly, especially where dealers misdiagnosed the ABS event and refused coverage.
Stage 1 (pre-recall): Replace transmission control valve body per TSB 21-NA-275. Stage 2 (recall 25V148): Reprogram TCM with updated software that monitors valve wear and limits transmission to 5th gear when excess wear is detected, preventing wheel lock-up. Some owners required full transmission replacement after catastrophic valve body disintegration.
engine overheating warning; oil in coolant overflow reservoir; coolant discharging from reservoir; milky or foamy coolant; oil pressure gauge shows high reading; reduced engine power message; AC disabled by ECM; chime with engine temperature warning; coolant consumption without visible external leak
An engine requiring full replacement due to a manufacturing casting defect is among the most substantiated grounds for a Song-Beverly claim. If a CT5 owner with the LGY V6 has had one or more engine-overheating repairs at the dealer without resolution — or if the dealer performed a partial fix that failed — the repeat-repair threshold under §1793.2 is likely met, supporting a repurchase demand.
Engine replacement is the GM-authorized remedy. Flush radiator, heater core, and all rubber coolant hoses with approved coolant-system flush solution. Partial repairs (e.g., replacing only the oil cooler) are not sufficient.
engine overheating warning; coolant temperature rising; reduced engine power; AC disabled by ECM; chime and 'engine idle' message displayed; no visible coolant leak externally; MIL illuminated with coolant-related DTC; high oil pressure reading on gauge
A coolant-circulation failure that can trigger engine overheating is a safety-adjacent powertrain defect. GM funded a Customer Satisfaction Program rather than a formal recall, but the remedy and qualifying criteria are similar. If a CT5 owner with the LSY engine experienced overheating and multiple repair attempts before the CSP was communicated, those visits count toward the Song-Beverly repair-attempt threshold.
Free replacement of the entire water pump assembly under GM Customer Satisfaction Program N202320510. Approximately 4 hours labor, no charge to owner.
exterior door handle does not open the door; door requires multiple attempts to open; driver locked out of vehicle; Service Door Latch warning; door indicator illuminated with door closed; all four doors progressively failing; handle fails in cold or moderate temperatures; door only opens with physical key; interior handle also stops working
Although classified as a functional issue, door handles that render entry impossible — particularly to passengers including children — can implicate safety considerations. Multiple NHTSA complaints (ODIs 11738510, 11728484, 11720298, 11715761 and others) document progressive failure across all doors on the same vehicle. If a CT5 owner has returned to the dealer three or more times for door-handle replacements, the repeat-repair prong of Song-Beverly (§1793.2(d)(2)) may be triggered.
Replace the door handle assembly (entire unit, not the switch alone). Cost per handle approximately $400–$500 at dealer. No GM-issued TSB with a root-cause fix as of mid-2026; no recall issued.
vehicle won't start after overnight parking; dead 12V battery with no apparent cause; Vehicle Update screen shows 0 percent complete; jump-start required; battery warning light; repeated battery failure across multiple charges; infotainment system stuck on loading screen
Repeated no-start events caused by a manufacturer software process — even if each individual event is resolved by a jump-start — constitute a substantive nonconformity under Song-Beverly if they substantially impair the vehicle's use. An owner who has experienced three or more battery-drain events tied to stuck OTAs should document each episode (date, mileage, repair order number) to establish the repair-attempt pattern.
Jump-start or recharge battery; cancel the stuck update via Vehicle Update screen. Dealer may need to reprogram infotainment module if update continues to fail. Ensure battery is load-tested and replaced if it has been deep-discharged multiple times.
remedy available
General Motors has decided that certain 2027 Chevrolet Bolt EV, 2025-2026 Cadillac OPTIQ, Chevrolet Colorado, Equinox EV, GMC Canyon, 2026 Buick Enclave, Envision, Cadillac CT5, Escalade, Escalade ESV, Escalade IQ, Escalade IQL, LYRIQ, VISTIQ, Chevrolet Blazer EV, Corvette Convertible, Corvette Coupe, Corvette Convertible E-Ray, Equinox, Silverado 1500, 2500, 3500, Silverado EV, Suburban 1500, Tahoe, Traverse, GMC Acadia, Hummer EV Pickup, Hummer EV SUV, Sierra 1500, 2500, 3500, Sierra EV, Terrain, Yukon, and Yukon XL vehicles. The radio may not have been set to the correct status to download the electronic owner's manual during production. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 208, “Occupant Protection.”
remedy available
General Motors LLC (GM) is recalling certain 2019-2020 Cadillac CT6, 2020-2021 CT4, CT5, and 2020-2022 Chevrolet Camaro vehicles equipped with a 10-speed transmission. The transmission may become damaged internally and cause the wheels to lock-up.
remedy available
General Motors, LLC (GM) is recalling certain 2020-2023 Cadillac CT4 and CT5; 2021-2023 Buick Envision; and 2022-2023 Cadillac Escalade and Escalade ESV, Chevrolet Silverado 1500, Suburban, Tahoe, GMC Sierra 1500, Yukon, and Yukon XL vehicles. The daytime running lights (DRLs) may not deactivate when the headlights are on. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 108, "Lamps, Reflective Devices, and Associated Equipment."
remedy available
General Motors, LLC. (GM) is recalling certain 2020-2022 Cadillac CT4 and CT5 vehicles. The roof rail side-curtain air bags may not have been installed correctly, which could result in an improper air bag deployment during a crash.
remedy available
General Motors, LLC (GM) is recalling certain 2021 Buick Envision, Cadillac CT4, CT5, Escalade, Escalade ESV, Chevrolet Tahoe, Corvette, Suburban, GMC Yukon, Yukon XL vehicles. The communications gateway module incorrectly processes a loss of communication with the sensing diagnostic module (SDM), causing the air bag malfunction indicator light to inconsistently illuminate.
remedy available
General Motors LLC (GM) is recalling certain 2020 Chevrolet Corvette and Cadillac CT4, CT5 and XT4, 2021 Chevrolet Trailblazer, and 2020-2021 Buick Encore GX vehicles. Sensor connection contamination in the electronic brake boost system may cause an interruption of communication between the sensor and the brake boost system.
Every item below comes from this vehicle's documented defects. The more you recognize, the more a free case review is worth your time.
Under California's Song-Beverly Consumer Warranty Act (Cal. Civ. Code §1790 et seq.), a manufacturer who sells a vehicle covered by an express warranty must repair any defect or nonconformity that substantially impairs the vehicle's use, value, or safety. If GM or its authorized Cadillac dealers cannot bring the CT5 into conformity after a reasonable number of repair attempts, California law may entitle you to a vehicle replacement or a full refund — including your down payment, monthly payments made, and incidental costs such as rental cars and towing. This information reflects California law as of June 2026 and is not legal advice; every case is different, and outcomes depend on the specific facts.
**What counts as a 'reasonable number of attempts'?** California presumes that two repair attempts for a defect likely to cause serious injury or death, or four repair attempts for any other defect, may be sufficient. The 10L80 transmission wheel lock-up (Recall 25V148) and the brake boost loss (Recall 20V588) are safety defects where two attempts may be enough. The electronic door handle failures, water pump defects, and ADAS dropouts may require a documented pattern of four or more visits.
**The 30-day rule.** If your CT5 has been out of service for a cumulative total of 30 or more calendar days during the warranty period for warranty repairs — including recall remedy wait times — you may independently qualify for relief, even without reaching the repair-attempt threshold. Owners affected by the 25V148 recall who waited months for a transmission valve body or TCM software update should track those days carefully.
**Manufacturer knowledge matters.** Six recalls and multiple TSBs demonstrate that GM was aware of CT5 defect patterns before many owners reported problems to dealers. Under Song-Beverly, manufacturer knowledge of a widespread defect strengthens a repurchase claim — it is evidence that the issue was not an isolated manufacturing anomaly.
*This is not legal advice, and reading this page does not create an attorney-client relationship. Consult a licensed California attorney to evaluate the specific facts of your situation.*
“Could not duplicate” doesn't mean the defect isn't real. Here's exactly what to do to protect a potential California lemon-law claim.
Document the moment it happens. Photos, video, and screenshots of any warning lights — with the date and the mileage.
Get a repair order every visit — even “found nothing.” That paperwork is the foundation of a claim.
Check your VIN at nhtsa.gov/recalls. Note any recall that has no available remedy yet.
Track your out-of-service days. California law counts the cumulative days your vehicle spends in the shop.
Keep loaner & rental records. Alternate-transport paperwork during long repairs matters.
Save everything in one place. Symptoms, dates, repair orders, and every repeat visit — the intermittent ones especially.
1. **Demand a road test.** The 10L80 valve body lurch and the ADAS dropout both occur intermittently. Ask the service advisor to join you for a highway test drive or to install a data logger. If they decline, write on the repair order: 'Customer requests technician replicate complaint under highway driving conditions. Issue occurs during coast-down from 65+ mph.' The dealer cannot legally return your car claiming 'unable to duplicate' without documenting the diagnostic steps they took.
2. **Request the repair order in writing before you leave.** Every dealer visit — even a 'no fault found' outcome — must generate a signed repair order with a date, mileage, and the specific symptom you reported. Under Song-Beverly, each visit that fails to fix the problem counts toward your repair-attempt total. Do not accept a verbal 'we checked it and it's fine.'
3. **Capture event data.** For transmission events, ask the dealer to pull the TCM's Freeze Frame data and DTC history. For ADAS dropouts, ask for a printout of DTCs U1614/U1615/U1616. For door handle failures, photograph all affected handles and request parts invoices that show what was replaced. This documentation is critical if the next dealer denies there is a pattern.
4. **Escalate to Cadillac Customer Care before your third visit.** Call 1-800-458-8006 and open a case number. Note the case number on every subsequent repair order. Cadillac's field technical assistance can authorize repairs that local dealers decline. Getting the manufacturer on record strengthens a future lemon-law claim.
5. **Reference the TSB or recall explicitly.** For the transmission, cite TSB 21-NA-275 and Recall 25V148. For the IPM/ADAS dropout, cite TSB 20-NA-178. For the water pump, cite Program N202320510. Dealers sometimes claim ignorance; a written repair order referencing the TSB number creates a record that GM was put on notice.
6. **Keep a written log.** Date, mileage, symptom description, advisor name, and outcome for every visit. If the problem persists after two visits for the same symptom, you are approaching the threshold where a California lemon-law attorney can evaluate your case at no cost to you.
7. **Do not accept 'normal operation' for the 10L80 transmission.** GM issued TSB 23-NA-153 characterizing some throttle-response delay as normal — but violent lurching, ABS events, or wheel lock-up are explicitly addressed by recall 25V148 and are not normal. If a dealer invokes 'normal operation' for these symptoms, request that finding in writing on the repair order.
The CT5's recall record is notable for a car in its second product generation. Three of the six formal recalls address either a direct safety hazard (brake assist loss in 20V588, wheel lock-up in 25V148) or a life-safety system that may not perform correctly in a crash (airbag deployment and warning in 21V611, 21V421). The transmission recall, in particular, is telling: GM published TSB 21-NA-275 in early 2022 directing dealers to replace the valve body, yet many owners report that dealers dismissed their transmission symptoms as normal behavior for years before the formal 2025 recall. That gap — between when the defect was known and when owners received an enforceable remedy — is exactly the gap that California lemon law is designed to close. CT5 owners with documented transmission, ADAS, door handle, or engine cooling complaints during the warranty period should seek a case evaluation.
— The Margarian Law team
If your Cadillac CT5 has been back to the dealer multiple times for transmission problems, ADAS failures, door handle defects, engine overheating, or any recall-related issue that keeps returning — you may have options under California's lemon law. Margarian Law has handled thousands of lemon-law cases and offers a free, no-obligation case review. You pay nothing unless we recover for you. Contact us today to find out if your CT5 qualifies.
Yes. In March 2025, GM issued safety recall 25V148 covering approximately 27,097 model-year 2020-2021 Cadillac CT5 vehicles equipped with the 10L80 10-speed automatic. The defect involves internal wear in the transmission control valve body that can cause a momentary rear-wheel lock-up at highway speed — a crash risk. Dealers update the transmission control module software so it can detect excess valve wear early and limit the transmission to 5th gear before wheel lock-up can occur. Some vehicles also require valve body or full transmission replacement. A prior GM technical service bulletin addressed the same root cause with a valve body replacement as early as January 2022. Contact Cadillac at 1-800-458-8006 or check nhtsa.gov/recalls with your VIN to confirm whether your vehicle is affected.
The CT5 uses power-presenting flush door handles that incorporate an electronic pressure-pad switch to signal the body control module to release the latch. The switch or its alignment components fail — often starting with one door and progressively spreading to the remaining three. NHTSA has received numerous complaints (including ODI 11738510, 11728484, and others across model years 2020-2023) documenting this progressive failure pattern. GM has not issued a recall for the door handles as of mid-2026. The only current remedy is handle replacement at roughly $400-$500 per door at the dealer. If your CT5 has had three or more door-handle repairs, document each repair order — under California's Song-Beverly Act, repeat warranty failures on the same component can support a lemon-law claim.
This symptom — along with DTCs U1614, U1615, or U1616 — is addressed by GM Technical Service Bulletin 20-NA-178, issued November 2021 for model-year 2020-2021 CT5 vehicles. The Image Processing Module (IPM) can enter a continuous reset loop at power-up, disabling all advanced driver assistance systems including Super Cruise, Forward Collision Alert, and lane-keep assist. The authorized fix is reprogramming the IPM with updated software. If the problem recurs after the reprogram, the dealer should inspect the IPM wiring harness. Multiple NHTSA complaints (e.g., ODI 11359880) document this symptom persisting through five or more dealer visits without a permanent fix — a pattern that may qualify for a Song-Beverly warranty repurchase claim.
Whether a specific CT5 qualifies as a lemon depends on its repair history, not the model alone. Under California's Song-Beverly Consumer Warranty Act (Cal. Civ. Code §1790 et seq.), a vehicle may qualify if it has a defect that substantially impairs its use, value, or safety, AND GM's authorized dealers have made a reasonable number of repair attempts without success — generally two attempts for safety defects or four for other defects. The CT5 has six NHTSA recalls (including a safety recall for transmission wheel lock-up, two airbag defects, and brake assist loss) plus TSB-documented engine and ADAS issues. Owners with documented dealer repair history for any of these problems may have a viable claim. A California lemon-law attorney can evaluate your case at no cost and determine whether you qualify for a refund or replacement.
Repeated unexplained battery drain on the 2021-2023 CT5 is often caused by an over-the-air (OTA) software update becoming stuck at 0% download progress. GM's Preliminary Information TSB PIT5966 identifies this condition: the stuck update keeps the ignition electronics active overnight, completely discharging the 12V battery. Check the Vehicle Update screen on your infotainment for an update stuck at 0%. Jump-start the battery and either allow the update to complete or cancel it via the screen menu. Have the dealer reprogram the infotainment module if the update repeatedly fails and verify the 12V battery has not been damaged by repeated deep discharges. Document each no-start event with date and mileage — if this happens three or more times, the pattern may support a Song-Beverly warranty claim.
Yes. NHTSA recall 21V421 (issued June 2021) covers 2021 Cadillac CT5 vehicles where a software defect in the communications gateway module causes the airbag malfunction indicator light to illuminate or extinguish inconsistently. This can mask a real SRS system fault, increasing injury risk. The remedy is a free software update to the gateway module, which can be performed over-the-air or at a dealer. Separately, recall 21V611 addressed improperly installed roof-rail curtain airbags on 2020-2022 CT5 models. If your airbag light is recurring after the recall software update was applied, document each dealer visit. An airbag warning light that a dealer cannot permanently resolve after multiple attempts is a safety nonconformity that may support a Song-Beverly claim.
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