{"nhtsa_id":10244947,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2023-11-06","date":"2023-10-27","document_id":"CB23-J-003","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING","mfr_system":null,"summary":"CUSTOMER SATISFACTION CAMPAIGN: In some 2022-2023 MY Isuzu F-Series trucks equipped with RPO 5U5 Tire Size 255/70R22.5, a calibration error caused the affected vehicles to be built with an incorrect tire size value. As a result, 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.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2023/MC-10244947-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2023/MC-10244947-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10244947","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"ISUZU","model":"F-SERIES","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":[]}