Overall, the C8 has earned a reputation as one of the more dependable sports cars on the market, with strong owner satisfaction scores, though like any first-generation platform redesign, it came with some early growing pains worth knowing about before you buy.
Jump to a section: Reliability scores · The DCT transmission · Other reported issues · Which model years improved · Quick reference table · FAQ
Reliability Scores
Owner survey data has scored recent C8 model years quite favorably, with 2025 model owners reporting strong overall satisfaction and reliability scores, and J.D. Power's dependability studies showing improving scores as software and build quality matured across model years.
The DCT Transmission
The Tremec-sourced eight-speed dual-clutch transmission has been the most frequently reported weak point, with issues ranging from fluid contamination to overheating under sustained track use. GM issued numerous service bulletins addressing leaky seals and software recalibrations aimed at improving durability.
Fluids
ACDelco 10-9243 Dexron VI Full Synthetic ATF 88865549, 1 Qt
$16.99Fluids for the drivetrain.
ACDelco 10-4034 Dexron LS 75W-90 Gear Oil 88862624, 32 oz
$42.99Fluids for the drivetrain.
Other Reported Issues
Water intrusion into the engine bay during washing, occasional frunk latch problems, battery drain, and HVAC quirks are among the other commonly reported complaints, though none of these are considered widespread, catastrophic failures.
Battery tools
TOPDON BT200 12V Car Battery Tester Digital Automotive
$103.99Weak batteries cause many C8 electrical gremlins.
FOXWELL BC521 2-in-1 Battery Charger & Tester, Test Before
$162.35Weak batteries cause many C8 electrical gremlins.
FOXWELL BT705 Car Battery Tester 24V 12V, Alternator and Load
$159.89Weak batteries cause many C8 electrical gremlins.
Which Model Years Improved
The debut 2020 model year carried typical first-year redesign growing pains, compounded by a COVID-disrupted production start that led to some quality inconsistencies. Subsequent model years benefited from refined software and manufacturing improvements, with more recent years showing measurably better dependability scores.
Scanners
FOXWELL NT726 Bidirectional OBD2 Scanner
$368.99Scanners for reading module codes.
FOXWELL NT614 Elite OBD2 Scanner
$233.69Scanners for reading module codes.
FOXWELL NT604 OBD2 Scanner
$209.09Scanners for reading module codes.
Quick Reference Table
| Area | What's Reported |
|---|---|
| Transmission (DCT) | Most frequently reported issue; multiple service bulletins issued |
| Water intrusion | Reported during washing on some units |
| Frunk latch | Occasional reports of latch issues |
| Overall trend | Improving scores in more recent model years |
Frequently Asked Questions
Should I avoid the 2020 model year specifically?
It's worth extra scrutiny given the documented first-year and COVID-related production issues, but it's not automatically a bad buy — a thorough pre-purchase inspection matters more than the model year alone.
Are DCT transmission problems common on every C8?
No — while it's the most frequently cited issue category, the majority of C8 owners don't report serious transmission problems, and GM's service bulletins address many of the documented failure modes.
Shop the Parts Mentioned
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MOTOPOWER MP69033 OBD2 Scanner — $49, reads and clears stored engine and transmission fault codes — useful when checking over a used C8.
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ACDelco GM OE dexos1 GEN 2 Full Synthetic 5W-30 Motor Oil (1 qt) — quality oil supports long-term engine health.
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ACDelco Gold Negative Battery Cable — addresses reported battery drain-related connection issues.
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Buffing & Polishing Pads Set — helps manage water exposure during washing.