#DTC
9 posts in Car Diagnostics blog about "DTC" — OBD-II diagnostics, DTC codes, repair. ← All posts
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P1xxx codes: why your scanner says "manufacturer specific" and what to do
The same number means different things on different cars. That is not a limitation of your tool — it is how the standard was written, and there is a way around it.
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Dodge and Ram: common OBD-II codes and Chrysler-family quirks
Dodge and Ram share modules and wiring conventions with the wider Chrysler group, including one architectural quirk that explains a whole class of confusing electrical faults.
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Suzuki: common OBD-II codes and where they come from
Suzuki engines are simple by modern standards, which makes their fault patterns predictable. Here are the codes that recur and what each usually turns out to be.
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Anatomy of a fault code: what every character in P0301 actually means
The five characters are not arbitrary. The letter names the system, the first digit says whether it is standard or manufacturer-specific, the second names the subsystem, and the last two pin it down. After this, codes read without a lookup table.
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When the scanner lies: ghost codes, false triggers, and why "a code" is not "a broken part"
The code points at a sensor and the sensor is fine. The code vanishes and returns a week later. Why that happens, how to tell a real fault from a side effect, and why the freeze frame decides more than the code does.
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Not all DTCs are equal: 4 severity levels (low, medium, high, critical) and how to prioritize
What DTC severity level means, how to tell "light from dust on the MAF" from "stop the engine now", which codes can wait, which are critical right now.
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Freeze Frame: how OBD "photographs" the moment of a fault and why it matters more than the DTC itself
What OBD-II Freeze Frame data is, which parameters it captures, how to read the ECU snapshot, and why an experienced diagnostician looks at it before the trouble code itself.
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Common Mercedes-Benz Faults: W204, W205, W211, W212 — DTC Codes
Catalogue of common Mercedes C-Class, E-Class, GLK, GLC faults: OM651 diesel, M271/M276 petrol, 7G-Tronic, AirMatic.
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How AI Explains Trouble Codes: 8 Agents Under the Hood
How Car Diagnostics AI works: eight specialised agents analyse DTC codes, predict failures, generate reports, and answer questions — inside a microservice architecture.