{"nhtsa_id":10247181,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2023-12-13","date":"2023-12-13","document_id":"N232427140","mfr_campaign":null,"replaces":null,"component":"ELECTRICAL SYSTEM","mfr_system":null,"summary":"Customer Satisfaction Program - Certain vehicles equipped with tire size 255/70R22.5 may have a calibration error where the vehicles were built with an incorrect tire size value. As a results, the speedometer will show a vehicle speed higher than the actual vehicle speed while driving and the odometer will accumulate miles faster (approximately 14% faster) than the “actual” or “True” vehicle miles. Additionally, mileage data collected and stored in the Mimamori Unit (MMU), will be incorrect. Dealer will have the Cummins Engine Control Module (ECM) reprogrammed with the correct tire size value and reprogram the MMU.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2023/MC-10247181-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2023/MC-10247181-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10247181","components":[{"id":"electrical","name":"Electrical system","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"6500HD","year_from":2022,"year_to":2023,"match":null,"vehicle_ids":[]}],"as_of":"2026-10-19","note":"A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.","attribution":[]}