Powertrain Malfunction

Complaints include transmission slipping, failure to shift gears, and overall powertrain control module issues. These can lead to drivability problems and potential failure. Estimated repair cost: $1,500 - $5,000+.

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2021 GMC Yukon XL Maintenance guide

Name: Maintenance dataset for 2021 GMC Yukon XL
Creator: Carfocal

v1.0Updated May 30, 2026Ethan Miller4 Sources Analyzed5 Critical Recalls

MAINTENANCE SUMMARY

The 2021 GMC Yukon XL, with a 'Below Average' reliability verdict, demands vigilant maintenance, particularly for its engine and powertrain. Owners should focus on preventative checks for potential connecting rod/crankshaft issues and fuel pump control module failures, as these are significant concerns based on complaint data.

View Critical Issue: Engine Failure (Internal Components)

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Reliability Score

Est. Annual Maintenance Cost

$500 - $800

TSBs & Recalls

140 TSBs | 19 Recalls

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Key Takeaways

The 2021 GMC Yukon XL has a 'Below Average' reliability rating.
Engine and powertrain issues are the most frequent and severe complaints.

3 more takeaways unlock below

Critical service intervals

Common failure analysis

Symptoms and prevention guidance