Sudden and complete loss of engine power, particularly concerning during highway driving. This issue can affect the engine, fuel, and powertrain systems simultaneously. Estimated repair cost: $500 - $2,500.

Unexpected steering behavior, including jerks or stiffness, especially noted during operation of advanced driver-assistance systems like Super Cruise. This can impact vehicle control. Estimated repair cost: $300 - $1,500.

Fuel/Propulsion System Issues

Problems related to the fuel delivery or overall propulsion system, contributing to performance issues or power loss. Estimated repair cost: $200 - $1,000.

CARFOCALvehicle research

2018 Cadillac CT6 Maintenance guide

Name: Maintenance dataset for 2018 Cadillac CT6
Creator: Carfocal

v1.0Updated May 30, 2026Ethan Miller4 Sources Analyzed

MAINTENANCE SUMMARY

The 2018 Cadillac CT6, with an 'Average' reliability verdict, presents potential concerns primarily with its engine and steering systems, as indicated by owner complaints. Vigilant inspection of these areas and adherence to a strict maintenance schedule are crucial for long-term ownership.

Powertrain: Plug-in Hybrid (PHEV)

View Critical Issue: Engine Power Loss

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Reliability Score

Est. Annual Maintenance Cost

$500 - $1,000

TSBs & Recalls

82 TSBs | 0 Recalls

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Key Takeaways

Focus on proactive maintenance for the engine and steering systems, the most commonly reported issues.
Adhere strictly to the 7,500-mile oil change and inspection schedule.

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Critical service intervals

Common failure analysis

Symptoms and prevention guidance