Drive DTCDiagnostics
Trouble codes, the health score, readiness monitors, misfires, live data and the battery test.
9 articles
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Battery and charging test
Grade the battery at rest, while cranking and while charging, and watch resting voltage over time.
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Clear trouble codes
Clearing is the one thing Drive DTC can change. You type CLEAR to confirm, and only engine and transmission codes are cleared.
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Misfire counts, self-test results and fuel trims
Per-cylinder misfire counts, the engine computer's own test results next to their limits, and what fuel trims say.
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Read trouble codes
Read stored, pending and permanent codes in plain English, with the freeze frame, likely fixes and typical costs.
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Readiness monitors and the drive-cycle coach
See which emissions self-tests are complete, how to finish the rest, and what the result means in your state.
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Scan every module on the bus
The Modules page asks every address on the diagnostic bus what it is and which codes it holds. Read-only.
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Start from a symptom or a warning light
Two pages that work with nothing plugged in, one for what the vehicle is doing and one for the light on the dash.
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Understand the health score and verdict
What the 0 to 100 score counts, what the verdict banner means, and why it is a summary rather than a diagnosis.
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Watch live data and record a drive
Gauges and 35+ values from the engine computer, recorded to CSV and charted on the Replay page.
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