Inclusion Criteria:
* Have Type 2 Diabetes Mellitus (T2DM) for ≥1 year prior to screening
* Treated for ≥90 days prior to screening with multiple daily injection (MDI) therapy
* on basal insulin or insulin glargine 100 U/mL \[Basaglar or Lantus\] or insulin glargin 300 U/mL, insulin determir, insulin degludec U-100, or neutral protamine Hagedorn (NPH) insulin) in combination with at least 1 prandial injection of bolus insulin (insulin lispro 100 U/mL or 200 U/mL, insulin aspart, insulin glulisine, regular insulin, fast-acting insulin aspart), or
* premixed analog or human insulin regimens with any basal and bolus insulin
* May have been treated with up to 3 oral antihyperglycemic medications (OAMs) including metformin, sodium-glucose cotransporter (SGLT)-2 inhibitor in accordance with local regulations. The dose of all OAMs must have been stable for ≥90 days prior to screening
* Have an HbA1c value ≥7.5% and ≤10% according to the central laboratory at screening
* Body mass index ≤45.0 kg/m²
* Have access to a telephone, or alternative means for close monitoring/communications
* Have refrigeration at home or have ready access to refrigeration for storage of insulin therapy
* Have a regular wake-sleep schedule (awake-work during the day and sleep during the night)
Exclusion Criteria:
* Having any other condition (including known drug or alcohol abuse, psychiatric disorder including eating disorder) that precludes the subject from following and completing the protocol
* Have been diagnosed, at any time, with type 1 diabetes mellitus (T1DM) or latent autoimmune diabetes in adults
* Have hypoglycemia unawareness as judged by the investigator
* Have had any episode of severe hypoglycemia (defined as requiring assistance due to neurologically disabling hypoglycemia) within the 6 months prior to screening
* Have had 1 or more episodes of diabetic ketoacidosis or hyperglycemic hyperosmolar state within the 6 months prior to screening
* Have a known diagnosis of secondary diabetes (for example, diabetes caused by hemochromatosis, acromegaly, chronic pancreatitis, or pancreatectomy)
* Excessive insulin resistance defined as having received a total daily dose of insulin \>2.0 U/kg at the time of screening
* Have a history of or are being evaluated for bariatric surgery including Roux-en-Y gastric bypass surgery, gastric banding, and/or gastric sleeve
* Have cardiovascular disease, within the past 6 months prior to screening, defined as stroke, decompensated heart failure (New York Heart Association Class III or IV), myocardial infarction, unstable angina pectoris, or coronary arterial bypass graft
* History of renal transplantation
* Currently receiving renal dialysis
* Serum creatinine \>2.0 mg/dL (177 µmol/L) at screening
* Have obvious clinical signs or symptoms of liver disease (for example, acute or chronic hepatitis or cirrhosis), or elevated liver enzyme measurements
* Have active or untreated malignancy, have been in remission from clinically significant malignancy (other than basal cell or squamous cell skin cancer) for less than 5 years, or are at an increased risk for developing cancer or a recurrence of cancer in the opinion of the investigator
* Have had a blood transfusion or severe blood loss within 90 days prior to screening or have known hemoglobinopathy, anemia, or any other traits known to interfere with measurement of HbA1
* Have presence of clinically significant gastrointestinal disease (for example, clinically active gastroparesis associated with wide glucose fluctuations) in the investigator's opinion
* Have used thiazolidinediones, glucagon-like peptide 1 receptor agonist, or pramlintide within 90 days prior to screening