One problem related to adaptive cruise control has been reported for the 2021 GMC Sierra 2500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2021 GMC Sierra 2500 based on all problems reported for the 2021 Sierra 2500.
Smog system check and engan warning light keeps come on.
| Warnings problems | |
| Adaptive Cruise Control problems |