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Cadillac · Known Issues

2020-2025 Cadillac CT4 Problems: 12 Known Issues

2020-2025 model years · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated September 2026

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Issue summary

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2020-2025 Cadillac CT4 has 12 documented known issues, with 6 rated critical. The most serious are Daytime Running Lights May Stay On with Headlights (Recall 22V903), 10-Speed Transmission Damage Can Cause Wheel Lock-Up (Recall 25V148), Electronic Brake-Boost Sensor Contamination Can Remove Assist (Recall 20V588), Airbag Warning Lamp May Not Illuminate Consistently (Recall 21V421), Roof-Rail Side-Curtain Airbags May Be Installed Incorrectly (Recall 21V611) and "Steering Assist Reduced" and "Service Driver Assist" Messages from Camera Module Communication Loss ($150-$1,600 repair). Across all issues with published estimates, repair costs range from $150 to $5,000. DIY maintenance guides at au7o.io.

In This Article

  • CT4 Safety/Recalls2
  • CT4 Transmission2
  • CT4 Exterior1
  • CT4 Brakes1
  • CT4 Steering1
  • CT4 Engine3
  • CT4 Electrical1
  • CT4 Suspension1
  • Recalls4
  • FAQ
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In This Article

  • Safety/Recalls2
  • Transmission2
  • Exterior1
  • Brakes1
  • Steering1
  • Engine3
  • Electrical1
  • Suspension1
  • Recalls4
  • FAQ

All 12 Known Issues

NHTSA Recalls4 recalls

POWER TRAIN:AUTOMATIC TRANSMISSION

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.

Campaign #25V14800006/03/2025

EXTERIOR LIGHTING:LIGHTING CONTROL MODULE:SOFTWARE

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."

Campaign #22V90300008/12/2022

AIR BAGS:SRS MALFUNCTION WARNING LAMP/LIGHT

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.

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Cadillac XTS30Cadillac CT524Cadillac Escalade20Cadillac Lyriq19Cadillac XT617Cadillac CT617

Frequently Asked Questions

What are the most common Cadillac CT4 problems?

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2020-2025 Cadillac CT4 has 12 documented issues. The most frequently reported are: Daytime Running Lights May Stay On with Headlights (Recall 22V903), 10-Speed Transmission Damage Can Cause Wheel Lock-Up (Recall 25V148), Electronic Brake-Boost Sensor Contamination Can Remove Assist (Recall 20V588). Of these, 6 are rated critical and should be addressed promptly.

Is the Cadillac CT4 reliable?

The 2020-2025 Cadillac CT4 has 12 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 6 issues are rated critical: Daytime Running Lights May Stay On with Headlights (Recall 22V903) and 10-Speed Transmission Damage Can Cause Wheel Lock-Up (Recall 25V148) and Electronic Brake-Boost Sensor Contamination Can Remove Assist (Recall 20V588) and Airbag Warning Lamp May Not Illuminate Consistently (Recall 21V421) and Roof-Rail Side-Curtain Airbags May Be Installed Incorrectly (Recall 21V611) and "Steering Assist Reduced" and "Service Driver Assist" Messages from Camera Module Communication Loss. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common Cadillac CT4 problems?

Repair costs for known Cadillac CT4 issues range from $0 to $5,000, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What year Cadillac CT4 is the most reliable?

Reliability varies across model years of the Cadillac CT4. Based on documented issues, problems are most commonly reported in earlier model years. Au7o recommends checking the specific known issues for your target year before purchasing, and having a pre-purchase inspection performed by a qualified mechanic. Our known issues database covers the 2020-2025 Cadillac CT4 with 12 documented issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports.

Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.

Data compiled from NHTSA recalls, manufacturer TSBs, automotive forums, and AI-assisted research. No aggregated owner-report counts available for this vehicle yet.

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On certain 2021 Cadillac CT4 vehicles, the communications gateway module can process loss of communication with the sensing and diagnostic module incorrectly, causing inconsistent illumination of the airbag malfunction indicator.

Common Symptoms

  • Open safety recall
  • Airbag warning lamp may not warn consistently

How to Fix

Check the VIN and recall completion history. Cadillac dealers update the communications gateway module software under recall N212338110.

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NHTSA Verified
High ConfidenceVerifiedReviewed Jul 2026

On certain 2020-2022 Cadillac CT4 vehicles, the roof-rail side-curtain airbags may not have been installed correctly and may deploy improperly in a crash.

Common Symptoms

  • Open safety recall
  • Side-curtain airbag installation concern

How to Fix

Check the VIN and recall status. Cadillac dealers inspect both roof-rail airbags and reinstall them as necessary under recall N212342780.

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Certain 2020-2021 Cadillac CT4 vehicles equipped with a 10-speed transmission can develop internal transmission damage that may cause the wheels to lock while driving.

Common Symptoms

  • Open safety recall
  • Unexpected wheel lock-up risk

How to Fix

Check the VIN and campaign status. Cadillac dealers install transmission-control-module monitoring software under recall N242480630; follow the campaign instructions if the software detects damage.

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CT4-V Blackwing cars ordered with the six-speed manual use a Tremec TR-6060. Owners consistently report that second gear is high-effort, notchy or outright baulks during the first few upshifts after a cold start, and in colder climates it can be difficult to select second at all until the gearbox reaches temperature. The high-temperature-capable manual transmission fluid GM specifies is very viscous when cold, which loads the second-gear synchro and slows synchronization. Most cars improve once warm and this is within the character of the TR-6060, but a subset of owners report second gear that stays notchy or grinds when hot, which is not normal and indicates genuine synchro or blocker-ring wear — some cars have had synchros or complete transmissions replaced under warranty.

Common Symptoms

  • Second gear notchy or high-effort when cold
  • Occasional grind on the 1-2 upshift
  • Hard to select second in cold weather
  • Improves after the transmission warms up
  • Grinding that persists when hot in worse cases

How to Fix

First establish whether the symptom disappears when the transmission is fully warm. If it does, treat it as fluid-viscosity behavior: avoid forcing second in the first few miles, shift to third and back down, and let the gearbox warm up. If second gear grinds or hangs up when hot, or the condition worsens over time, document it with a dealer road test and pursue a warranty claim — dealers have ordered second-gear synchro sets and, in worse cases, replaced the transmission. A fluid change with the current GM-specified manual transmission fluid should be done before any teardown.

Typical repair cost:$200 - $5,000

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Community Reported
Medium ConfidenceVerifiedReviewed Aug 2026

On certain 2020-2023 Cadillac CT4 vehicles, the daytime running lights may not deactivate when the headlights are on, creating excess glare and failing FMVSS 108.

Common Symptoms

  • Open safety recall
  • Daytime running lights remain on with headlights

How to Fix

Check the VIN and recall status. The body-control-module software is updated by a dealer or over the air under recall N222386380.

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On certain 2020 Cadillac CT4 vehicles, contamination at a sensor connection can interrupt communication with the electronic brake-boost system and remove brake assist, requiring extra pedal force.

Common Symptoms

  • Open safety recall
  • Loss of brake assist

How to Fix

Check the VIN and recall completion history. Cadillac dealers replace the electronic brake-boost module under recall A202307260.

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Early CT4s display a recurring driver information center warning reading 'Steering Assist is Reduced - Drive With Care', often together with 'Service Driver Assist', a check engine light, and loss of lane keep assist and other ADAS features. In many cases steering effort is genuinely higher. GM's preliminary information PIC6404 for 2020 CT4 and CT5 attributes the message set to a loss of communication with the front camera module and related driver-assist modules rather than a failure of the electric power steering rack itself, because the lane-keep torque overlay function is arbitrated through those modules. Owners report the warning appearing on brand-new cars and dealers initially having no repair available.

Common Symptoms

  • 'Steering Assist is Reduced - Drive With Care' message
  • 'Service Driver Assist' message
  • Check engine light on with the steering warning
  • Noticeably heavier steering effort
  • Lane keep assist and other ADAS features unavailable

How to Fix

Have the dealer scan all modules for loss-of-communication codes and follow PIC6404 rather than condemning the steering gear. The usual fixes are reprogramming the front camera module, the power steering control module and the serial data gateway to current calibrations, and repairing chafed or corroded connectors in the harness feeding the camera and steering modules. Only if module communication is clean and the torque sensor or assist motor is genuinely out of range should the electric power steering gear be replaced. Windshield replacement or camera work should always be followed by a camera recalibration.

Typical repair cost:$150 - $1,600

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Community Reported
Medium ConfidenceVerifiedReviewed Aug 2026

CT4-V Blackwing owners report a rhythmic squeak, chirp or squelching noise that rises in frequency with engine speed, most noticeable pulling away from a stop or under light throttle at low RPM and generally worse once the engine is fully warm. The noise is engine-speed related rather than road-speed related, so it is not a brake or wheel bearing issue. Owners and dealers have chased it to several sources on the LF4 3.6L twin-turbo: turbocharger wastegate actuators and their linkages, loose charge-air (boost) pipe clamps, turbo bearing noise, throttle body operation, and in some reports the high-pressure fuel pump drive. Several cars have had turbochargers replaced under warranty and the noise resolved.

Common Symptoms

  • Squeak or chirp when pulling away from a stop
  • Noise frequency increases with engine RPM
  • Worse once the engine is warmed up
  • Squelching sound under light throttle
  • Occasional stumble from idle alongside the noise

How to Fix

Have a helper slowly raise engine speed with the hood open and use a stethoscope or hose to isolate whether the noise tracks the turbos, the throttle body, or the high-pressure fuel pump. The cheap checks first: re-torque all charge-air pipe clamps and inspect the couplers for slipping, then check the wastegate actuator rods for dry pivots or binding. If the noise localizes to a turbocharger center section, document it for warranty — multiple owners have had turbos replaced under the powertrain warranty with the noise gone afterward. Do not accept 'that is normal' without an isolation test.

Typical repair cost:$150 - $3,500

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Community Reported
High ConfidenceVerifiedReviewed Aug 2026

On the 2.0L turbo LSY four-cylinder used in the CT4 base/Luxury/Premium Luxury/Sport, oil weeps from what appears to be several places at once — the camshaft carrier cover, the engine front cover, the timing chain upper cover, and the lower oil pan. GM's own bulletin traces most of these to an improper amount of RTV sealant applied to the cam carrier cover gasket during engine assembly, so the leak is a manufacturing defect rather than normal gasket aging. Oil migrates down the front of the block and drips onto the subframe and exhaust, producing a burning-oil smell and low-oil messages between changes. Owners of both the CT4 and its LSY-engined sibling XT4 report the same leak, often re-appearing after a first repair attempt if the mating surfaces were not fully cleaned.

Common Symptoms

  • Oil drips on driveway under the front of the engine
  • Burning oil smell after driving
  • Oil residue visible on the front cover and camshaft carrier area
  • Low engine oil message between oil changes
  • Repair performed once but leak returns

How to Fix

Follow GM bulletin 21-NA-240: clean and dye-trace the engine to confirm the true origin before replacing anything, since the visible drip point is usually far below the source. The correct repair is to remove the camshaft carrier cover, completely strip the old sealant from both surfaces, and re-seal with the specified sealant bead and torque sequence; the front cover and oil pan are re-sealed only if independently confirmed leaking. Have this done under powertrain warranty if the vehicle still qualifies. Do not accept a simple 'add stop-leak' or 'monitor it' answer — the leak progresses.

Typical repair cost:$450 - $1,800

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Community Reported
High ConfidenceVerifiedReviewed Aug 2026

The LSY 2.0L turbo routes crankcase vapors through a PCV/crankcase pressure sensor mounted in the valve cover area. In cold climates and on short-trip driving, water vapor condenses in the sensor port and hose and then freezes, blocking the reference passage. The ECM sees an implausible crankcase pressure signal and sets P04FB (Crankcase Ventilation Hose Connection Sensor Range/Performance), lighting the check engine light. Because the ice thaws once the car sits in a warm shop, dealers frequently find 'no problem found' and simply clear the code, and some replace the sensor unnecessarily. GM addressed it in a preliminary information bulletin covering CT4 and other LSY-equipped vehicles.

Common Symptoms

  • Check engine light appears in cold weather
  • Code returns after clearing during winter
  • No driveability symptom other than the MIL
  • Dealer reports 'no problem found'

How to Fix

Per GM's PIP5841-series diagnostic tip, do not replace the sensor on the first occurrence. Remove the crankcase pressure sensor and hose assembly, inspect for frozen moisture or ice, allow it to thaw and drain completely, then clear all residual moisture with low-pressure compressed air and a shop towel before reinstalling. Check the PCV hose routing for low spots that trap condensate. If the code returns repeatedly in warm weather, then diagnose the sensor and the PCV/valve cover assembly itself. Longer drive cycles that fully warm the engine reduce recurrence.

Typical repair cost:$0 - $350

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Community Reported
High ConfidenceVerifiedReviewed Aug 2026

A software defect in the serial data gateway module can leave vehicle modules awake after an over-the-air update completes, so the car never fully goes to sleep. The result is partial or complete 12-volt battery drain — the car will not start after sitting, or starts weakly and throws a cascade of unrelated module warnings caused by low system voltage. GM opened Customer Satisfaction Program N242435630 for the 2025 CT4 covering exactly this failure, holding affected inventory units from sale until reprogrammed. The same low-voltage-after-sitting complaint appears in owner discussion of GM's OTA update rollouts more broadly, so the symptom is worth checking on any OTA-capable CT4 that repeatedly wakes up with a dead battery.

This issue also affects: Buick LaCrosse, Buick Regal, Chevrolet Cruze

Common Symptoms

  • Vehicle will not start after sitting a few days
  • Repeated dead 12-volt battery
  • Multiple unrelated module warning messages on startup
  • Battery drain begins after an over-the-air update

How to Fix

Have the dealer perform Customer Satisfaction Program N242435630, which reprograms the serial data gateway module — no new parts are required and the program is free of charge. Before or after the reprogram, have the 12-volt AGM battery load-tested and recharged properly; a battery that has been deeply discharged several times is usually damaged and should be replaced, not just recharged. If drain persists after the reprogram, a parasitic draw test module-by-module is the next step rather than repeatedly replacing batteries.

Typical repair cost:$0 - $400

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Community Reported
High ConfidenceVerifiedReviewed Aug 2026

CT4 owners across trims report a distinct pop, thump or creak from one or both front corners when crossing driveway dips, manhole covers, speed bumps, or during sharp low-speed steering maneuvers. The Alpha 2 front suspension uses a double-pivot strut arrangement, and the noise has been traced by owners and dealers to individual defective front struts — in several cases the strut body was found wet with damper fluid — as well as to strut mount and bushing seating. GM has circulated engineering-information requests asking technicians to complete a checklist when a popping or thump-type noise is heard from the front suspension during sharp maneuvers, which indicates GM is collecting field data on a recognized pattern rather than treating each car as a one-off. Many owners are told nothing is wrong on the first visit even when the technician can hear the noise.

Common Symptoms

  • Pop or thump from a front corner over small bumps
  • Creaking from the front struts over speed bumps
  • Noise during sharp low-speed steering
  • Damper fluid visible on the strut body
  • Noise worsens after roughly 20,000 miles

How to Fix

Insist the dealer complete GM's front-suspension noise checklist and road-test with a technician in the car rather than relying on a shop-floor bounce test. Inspect both front struts for damper fluid on the body — a wet strut is a warranty replacement. If the struts are dry, check the strut mount bearing, the upper mount fasteners and the lower control arm bushings, and verify all suspension fasteners were torqued at ride height, not on the hoist. Replace the offending strut assembly; owners who had a single defective strut replaced report the noise gone.

Typical repair cost:$400 - $1,300

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Community Reported
Medium ConfidenceVerifiedReviewed Aug 2026
Campaign #21V42100010/06/2021

AIR BAGS:SIDE/WINDOW:CURTAIN

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.

Campaign #21V61100005/08/2021

Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.

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What is the 2020-2023 Cadillac CT4 Daytime Running Lights May Stay On with Headlights (Recall 22V903)?

On certain 2020-2023 Cadillac CT4 vehicles, the daytime running lights may not deactivate when the headlights are on, creating excess glare and failing FMVSS 108. Severity: high.

What is the 2020-2021 Cadillac CT4 10-Speed Transmission Damage Can Cause Wheel Lock-Up (Recall 25V148)?

Certain 2020-2021 Cadillac CT4 vehicles equipped with a 10-speed transmission can develop internal transmission damage that may cause the wheels to lock while driving. Severity: high.

What is the 2020 Cadillac CT4 Electronic Brake-Boost Sensor Contamination Can Remove Assist (Recall 20V588)?

On certain 2020 Cadillac CT4 vehicles, contamination at a sensor connection can interrupt communication with the electronic brake-boost system and remove brake assist, requiring extra pedal force. Severity: high.

What is the 2021 Cadillac CT4 Airbag Warning Lamp May Not Illuminate Consistently (Recall 21V421)?

On certain 2021 Cadillac CT4 vehicles, the communications gateway module can process loss of communication with the sensing and diagnostic module incorrectly, causing inconsistent illumination of the airbag malfunction indicator. Severity: high.

What is the 2020-2022 Cadillac CT4 Roof-Rail Side-Curtain Airbags May Be Installed Incorrectly (Recall 21V611)?

On certain 2020-2022 Cadillac CT4 vehicles, the roof-rail side-curtain airbags may not have been installed correctly and may deploy improperly in a crash. Severity: high.

What is the 2020 Cadillac CT4 "Steering Assist Reduced" and "Service Driver Assist" Messages from Camera Module Communication Loss?

Early CT4s display a recurring driver information center warning reading 'Steering Assist is Reduced - Drive With Care', often together with 'Service Driver Assist', a check engine light, and loss of lane keep assist and other ADAS features. In many cases steering effort is genui… Repairs typically run $150-$1,600. Severity: high.

What is the 2022-2025 Cadillac CT4 Tremec TR-6060 Manual: Notchy and Grinding Second Gear When Cold?

CT4-V Blackwing cars ordered with the six-speed manual use a Tremec TR-6060. Owners consistently report that second gear is high-effort, notchy or outright baulks during the first few upshifts after a cold start, and in colder climates it can be difficult to select second at all… Repairs typically run $200-$5,000. Severity: medium.

What is the 2025 Cadillac CT4 Over-the-Air Update Leaves Modules Awake and Drains the 12-Volt Battery?

A software defect in the serial data gateway module can leave vehicle modules awake after an over-the-air update completes, so the car never fully goes to sleep. The result is partial or complete 12-volt battery drain — the car will not start after sitting, or starts weakly and t… Repairs typically run $0-$400. Severity: medium.

What is the 2022-2025 Cadillac CT4 CT4-V Blackwing LF4 Squeak and Chirp at Low RPM Under Light Throttle?

CT4-V Blackwing owners report a rhythmic squeak, chirp or squelching noise that rises in frequency with engine speed, most noticeable pulling away from a stop or under light throttle at low RPM and generally worse once the engine is fully warm. The noise is engine-speed related r… Repairs typically run $150-$3,500. Severity: medium.

What is the 2020-2024 Cadillac CT4 Front Strut Popping and Thump Noise Over Small Bumps?

CT4 owners across trims report a distinct pop, thump or creak from one or both front corners when crossing driveway dips, manhole covers, speed bumps, or during sharp low-speed steering maneuvers. The Alpha 2 front suspension uses a double-pivot strut arrangement, and the noise h… Repairs typically run $400-$1,300. Severity: medium.

What is the 2020-2025 Cadillac CT4 LSY 2.0T Cam Carrier Cover Sealant Defect Causes Engine Oil Leaks?

On the 2.0L turbo LSY four-cylinder used in the CT4 base/Luxury/Premium Luxury/Sport, oil weeps from what appears to be several places at once — the camshaft carrier cover, the engine front cover, the timing chain upper cover, and the lower oil pan. GM's own bulletin traces most… Repairs typically run $450-$1,800. Severity: medium.

What is the 2020-2025 Cadillac CT4 Crankcase Pressure Sensor Ices Over in Cold Weather Setting P04FB?

The LSY 2.0L turbo routes crankcase vapors through a PCV/crankcase pressure sensor mounted in the valve cover area. In cold climates and on short-trip driving, water vapor condenses in the sensor port and hose and then freezes, blocking the reference passage. The ECM sees an impl… Repairs typically run $0-$350. Severity: low.