How to compare owner complaints without inventing a reliability score

2026-09-13 (September 13, 2026)

Owner complaints can identify subjects worth investigating. They cannot, on their own, measure the share of vehicles with a defect.

Start with the same model year

A model sold for more years can accumulate more complaints. Even two vehicles from the same year can have different sales volumes, usage and owner reporting behavior. A larger complaint total is not automatically a higher failure rate.

The Toyota RAV4 and Honda CR-V comparison puts shared model years side by side. It leaves out a reliability score because the source records do not provide the denominators needed to justify one.

Read the component and the narrative

A complaint can list several components. A narrative mentioning a transmission may describe a diagnosis, a suspicion, a comparison or an unrelated service visit. Topic counts are a way to find records, not a final mechanical diagnosis.

Read a few source examples, note their ODI numbers, and look for questions that a mechanic or manufacturer can answer. Keep owner allegations separate from official recall findings.

Look for missing information

Vehicle counts, distance traveled, maintenance and reporting rates affect comparisons. Vehicle Signal shows raw counts and the calculation rules. The original complaints are available through the NHTSA datasets and APIs.