Cadillac CT4 Problems: 2 Issues Every Owner Should Know

2020-2025 model years · Based on 0+ owner reports · Last updated March 2026

According to Au7o's analysis of 0+ owner reports, the 2020-2025 Cadillac CT4 has 2 documented known issues. No issues are rated critical, indicating generally reliable ownership. Across all issues, repair costs range from $0 to $1,200. Full technical analysis and DIY maintenance guides at au7o.io.

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All 2 Known Issues

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The CT4 base model uses the 2.0T LSY engine which shares the valve cover/PCV failure and turbo coolant line concerns found in the XT4. The PCV system integrated into the valve cover can fail between 40,000-80,000 miles, causing oil consumption, vacuum leaks, and rough idle. Turbo coolant line connections can develop slow leaks. The CT4-V uses a 2.7T engine (L3B) with different issues. The CT4-V Blackwing uses the 3.6L Twin-Turbo (LF4) which is bespoke and generally reliable.

Common Symptoms

  • Check engine light with misfire or lean codes
  • Excessive oil consumption
  • Rough idle
  • Coolant level dropping slowly
  • Turbo-related noises or performance changes

How to Fix

Replace valve cover assembly for PCV failure (GM updated design available). Inspect and replace turbo coolant lines if leaking. 5,000-mile oil change intervals with full synthetic are important for turbo longevity.

What Owners Are Using

Parts and tips from 0+ owners who fixed this issue

  • TipSame LSY 2.0T turbo as XT4. GM Turbocharger Coolant Feed Pipe (12691901) plus gasket (55504552) are the primary failure points. Inspect at every oil change for coolant weeping around turbo area. Replace preventively at 60,000 miles
  • TipGM PCV Valve 55514392 is the same LSY-specific part across all applications (CT4, XT4, Equinox, Malibu). PCV failure symptoms: excessive oil consumption, check engine light, boost pressure codes. Relatively inexpensive part ($30-50) but labor can be $200+ at dealer
  • Tip5,000-mile oil change intervals with dexos1 Gen 3 0W-20 are critical for LSY turbo longevity. Monthly coolant level checks catch turbo coolant line leaks early. The CT4-V Blackwing uses a different engine (LF4 3.6TT) and is NOT affected by these LSY-specific issues
Typical repair cost:$200 - $1,200

Research This Issue

0+ owners have reported this issue

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Medium Confidence0 reportsLast reported by owners Feb 2026Reviewed Feb 2026

The 2020-2022 CT4 infotainment system (Cadillac User Experience) suffers from slow response times, screen freezing, and significant glitches. The touchscreen can become unresponsive, the radio may produce no sound, and the turn signal audio indicator can fail. Cadillac has released software updates to address some issues, but problems persist for some owners.

Common Symptoms

  • Touchscreen slow to respond or frozen
  • No sound from radio or speakers
  • Turn signal click sound not working
  • Screen goes black on startup
  • Bluetooth connectivity drops repeatedly

How to Fix

Typical repair cost:$0 - $800

Research This Issue

0+ owners have reported this issue

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Medium Confidence0 reportsLast reported by owners Invalid DateReviewed Invalid Date

Frequently Asked Questions

What are the most common Cadillac CT4 problems?

According to Au7o's analysis of 0+ owner reports, the 2020-2025 Cadillac CT4 has 2 documented issues. The most frequently reported are: 2.0T LSY Engine - Valve Cover/PCV and Coolant Issues, Infotainment System Lag and Screen Freezing. None are rated critical, but regular maintenance is recommended.

Is the Cadillac CT4 reliable?

The 2020-2025 Cadillac CT4 has 2 known issues documented across 0+ owner reports. No issues are rated critical, suggesting generally good reliability. 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 $1,200, 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 owner reports, issues 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 2 documented issues from 0+ owner reports.

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